Music In Advertising And The Media Media Essay

Music In Advertising And The Media Essay Music is surrounding us. It is a steady in our lives. In spite of the fact that the music that we hear changes after some time it is consistently there. What is in today might be out tomorrow. We hear it in the vehicle in the best approach to work, and once we arrive it is playing out of sight in the workplace. It is at the stores where we shop, in the lifts we ride, during the business breaks of our preferred TV programs, at the rec center where we work out, and a lot more places we go. With the galactic measure of music that encompasses us in our regular day to day existences is no big surprise that organizations use it as a middle to promote their administrations and items to us. Publicizing is the methods by which on party endeavors to persuade or allure another into buying a specific item or administration. It varies from the kind of one-on-one attempt to seal the deal an individual may experience at the retail location in that it tends to a bigger, progressively broad crowd (Hu ron). Promoting is instrumental to the accomplishment of organizations. On the off chance that nobody realizes that the business exists or they have no clue about what items or administrations are offered, in what capacity will they get clients? The way to business is to publicize, to ensure that a companys items or administrations are known to the world. Individuals love music. Consolidating the two is sheer virtuoso. Music can achieve numerous things when incorporated with notices. In promoting it is utilized to engage, as a mental aide to trigger memory, and to focus on a particular segment. At the point when music is utilized in publicizing for diversion purposes it makes the commercial all the more speaking to its focused on crowd. A decent promotion gets and holds the consideration of the crowd. It is essentially utilized for tasteful purposes. Making an alluring notice permits it to claim more to a crowd of people in this way captivating the crowds consideration. Music is likewise utilized in publicizing as a procedure to help in memory. Early promoting grasped this procedure. Rhyme and redundancy were utilized to keep a brand or name of an item as a primary concern. There are a few reasons that customers buy certain merchandise or administrations. As indicated by an article in The Economic Times one of the main considerations in customer buying is the way that the human mind discharges the concoction dopamine in light of the item. Generally solid or scent are the boosts that cause this impact. The explanation this happens is that the human psyche is mind boggling and Because intentionally or not, we ascertain buys dependent on how they may bring us societal position and status is connected with regenerative achievement (Dobhal). There are a few unique choices for publicists to look over to advance their item or administration. There is print, radio, and TV to give some examples. Coming up next is a short history of commercials from print to TV: Early print notices showed up in the paper and as banners with pictures and text in mainstream areas. This type of ad is still being used today and is likewise effective and is found wherever from papers, magazines, to mainstream exchange diaries. Boards are another type of print publicizing, they a somewhat enormous signs that are situated in an obvious area that individuals will see (Phillips). Radio publicizing is probably the soonest type of promotion is broad communications. The primary discourse transmission by radio was in 1915 from New York to San Francisco, five years after this memorable day, the main radio program publicized. A transformation had started. With a huge number of Americans checking out hear the radio projects, this is the place promoters hit t he big stake. TV promotions before long followed. Since the TV has such a wide reach, from the earliest starting point it turned into an alluring mode for sponsors. U.S. publicizing rates are controlled by Nielsen evaluations which are crowd estimation frameworks that were created by the Nielsen Research Company. The hour of day and prevalence of the direct are figured in to decide the promoting rates. The TV become monetarily accessible during the 1930s yet didn't pick up fame until the 1950s. Today 99 percent of family units in the United States have at any rate one TV and 66 percent have at least three. The normal American watches one thousand 500 hours of TV for every year (Television and Health). In the mid 1980s the enthusiasm for utilizing music to publicize significantly expanded. Following an examination named the disposition towards the promotion which demonstrated that customers reacted contrarily towards the manipulative and constrained methodology that publicists were utilizing. The examination reasoned that customers were left with an increasingly positive inclination towards the item music was brought into the notices. The investigation additionally demonstrated that when matching well known music with the item customers would relate the two and in the event that they like the music they might want the item. (Chingning Wang)This approach has been condemned anyway it the verses are appealing and stay in your mind the promoter has viably achieved their undertaking. Publicists initially composed their own infectious tunes to showcase an item. These are known as jingles. There are numerous jingles for items that you may at present recall right up 'til today in spite of the fact that you havent heard them in years. One such jingle is for Oscar Mayer, and goes like this My bologna has a first name. Its O-S-C-A-R. My bologna has a subsequent name. Its Mayer. Gracious, I love to eat it consistently and in the event that you ask me for what valid reason Ill state cause Oscar Mayer has special insight with B-O-L-O-G-N-A. That is one jingle that most probable has been heard by almost all Americans. Before the 1980s these are the sorts of music that one would here in a business every so often the verses of a well known melody would be changed to make a signature tune for a specific item or administration. On one event a signature tune that was composed for coca-cola called Id Like to Buy the World a Coke was re-recorded by the New Seekers as a pop melody called Id Like to Teach the World to Sing (The Hilltop Ad: The Story of a Commercial). This tune turned into a hit. The utilization of recently recorded pop melodies was in the long run coordinated into advertisements. In 1985 Burger King utilized a unique melody by Aretha Franklin called Freeway of Love in an ad to advance the drive-through joint (TV Commercials in the United States). In 1987 Nike received the Revolution by The Beatles to publicize their shoes and other sports equipment just as utilizing as a push to redesign their promoting and advertising efforts to contend with the main shoe brand at the time which was Reebok (The Pop History Dig). An intriguing however dubious hypothesis is subconscious cues. A subtle prompt is a shrouded message inside a business, music, or even a film. These messages are intended to be unnoticed by the audience yet they are intended to incite the audience to react here and there. As indicated by an article by Robert Fink in the Journal of Ancient of Ancient Music promoters have asserted that they can make anybody purchase anything by including subtle cues inside their ads (Fink). In 1957 James Vicary, an economic scientist created mischief with shoppers when he reported that by installing subtle cues in the music of radio commercials he could convince customers to buy anything. General society expected this was valid and imagined that they were being spellbound with notices (Crossen). One organization that likely strikes a chord when you consider music and promoting is the well known soda pop Pepsi. The organization, PepsiCo has a past filled with blending well known music into their promotions. A portion of the numerous specialists Pepsi highlighted in their notices incorporate Michael Jackson, Britney Spears, Akon, Bob Dylan, and some more. PepsiCo is a fruitful organization. Shoppers are besieged with music and ads all through their run of the mill day. Promoting is an incredible and powerful instrument, it is intended to advise the audience regarding the item or administration, and afterward convince them to buy it. It is evident to bring up that the better a promotion is the more viable it will be at convincing the client to buy the item. Publicists utilize numerous procedures some of which are peer weight and control. Promoters focus on a group of people and utilize these strategies to attempt to persuade the audience that they will be a piece of the part of society worthy of anyone's attention on the off chance that they buy the item. This is an exceptionally viable type of notice. Publicists focus on a particular segment, for example, 18-multi year olds. To utilize music successfully in this segment they would clearly utilize music that most 18-24 years olds would tune in to and not something like great stone albeit a few people in that segment may appreciate exemplary stone they are attempting to arrive at the larger part. Consider this, would you be able to recollect a specific jingle or melody and naturally partner it with an item. I am certain that most everybody can. Scientists have indicated that the best ads promotions are the ones that work up feeling and make a relationship with the item (Vaughn). Since individuals are shelled with such huge numbers of notices each day publicists are progressively utilizing unpredictable methods. One such strategy includes the utilization of incongruent notices. This is the place sponsors blend things up a bit. They use music and other craftsmanship that would regularly be startling. This works as a result of something many refer to as brand pattern which is the point at which an individual turns out to be so acquainted with an item from commercials it turns out to be practically imperceptible to them, they dont truly give a lot of consideration to it. Promoters presently are attempting to blend it up and by and by recover their thoughtfulness regarding the item that they are selling. This exploration was led to decide the effect of varying media congruency in advertisements and the directing job of item inclusion on three parts of shopper reaction: consideration regarding the promotion, thoughtfulness regarding the brand, and buy goals. The m embers were

Effects Of Culture Within Humans Architecture Essay

About each conceivable natural factor that could hold been engaged with grown-up guys physical advancement has been thought of, however until the extremely ongoing these days the capacity played by social factors in the physical improvement of grown-up male has gotten essentially no going to † ( Montagu, 1962 ) . This is somewhat astounding visual recognition as that Darwin, in his 1871 publicationThe Descent of grown-up male,placed extraordinary emphasize on the improvement of insight, human progress, etc on the physical advancement of universes. However Darwin ‘s infiltration has appeared to hold been over looked. Until late numerous physical anthropologists have been taking a gander at what the physical, natural power per unit zones has had an outcome on universes physical attributes, about totally disregarding that â€Å" grown-up male ‘s boss offices of adapting to the physical condition is human progress † ( Montagu, 1962 ) . Culture is a methodology th at non simply controls the power per unit territories of characteristic decision, yet every piece great, modifies the power per unit zones. This becomes clear when we watch the advancement of instruments, sexual decision, cultural decision, relocation, improved consideration of children, etc. Through social power per unit zones we see rough nature, changed into human instinct. â€Å" The improvement of knowledge logically liberated grown-up male from the subjugation of naturally foreordained reaction instruments † ( Montagu, 1962 ) . This firmly moved normal decision to go off from esteeming having the option to react instinctually, and switch towards respecting the individuals who could do the most profitable reaction to conditions. Along these lines, inside my exposition I will venture out on to more remote talk the impacts that progress has had on the advancement of universes ***CONTINUE LATER*** â€Å" It was the accomplishment of the easiest devices that began the entire inclination of human turn of events and prompted the civilisation of today † ( Montagu, 1962 ) . It was one time accepted that as we advanced into huge brained, two-footed presences, going to our present region before we principal created devices. However, as fossil grounds repudiates, apparently old chimps had been using apparatuses a large portion of a million mature ages prior. It has been conjectured that â€Å" grown-up male † first started a million mature ages prior, when populaces of primates changed into bipedal, device using creatures, which clearly offered ascend to the variety Australopithecus. â€Å" Most of the conspicuous contrasts that recognize grown-up male from chimp came after the use of apparatuses † ( Montagu, 1962 ) . Most grounds in regards to the section and advancement in universes originate from breaking down dentitions, castanetss and instruments, yet the cha nges and improvement of chimps was more than simply morphological. Change happened in types of life of smart Primatess, which was mindful because of new frameworks of child consideration, maturing and sex. Everything from fire, to runing, complex cultural life, address, devices, all advanced with the encephalon together arranging the Genus gay, a large portion of a million mature ages back. When again the encephalon developed creation the present species today, Homo sapiens, from the power per unit territories of progressively complex cultural life, 50 thousand mature ages prior. It was non until the find at Olduvai by Mary Leakey that we could principal happen pertinent proof that our ascendants were plainly using rock devices around five 100 thousand mature ages back. Inside the site, rock instruments, with cockerel rock and waste pieces were found, as acceptable with the remaining parts of minimal vitalize being and gnawers. The remaining parts of their pelvic supports show these primates were two-footed. In spite of the fact that their pelvic supports intently take after present day universes shape at the top as being more extensive and shorter, yet the underside of the pelvic support still intently takes after that of a gorilla. It is accepted that to go bipedal an uprooting in the morphology of the upper pelvic support is required first, and the adjustment of the lower pelvic support in this manner would do bipedalism progressively effective. Their bow, this gorilla man like species in Olduvai is in mid transmutation. Bipedalism created in them as an adjustment fit best for significant distance travel, what is required for runing. As they developed in excess of five 100 thousand mature ages prior, as great did the development of their pelvic support ‘ , alongside an around two-fair hit in cranial size. As proposed by Darwin, this suggests â€Å" that apparatus use is both the reason and the result of two-footed thought process power † ( Mont agu, 1962 ) . With bipedalism, it other than empowered universes more opportunity of their authorities to more distant create instruments, which would follow with the creating utilization of having the option to move, dramatization and use such focuses as sticks and shakes. Bipedalism changed more than the morphology of the pelvic support, it other than morphologically changed the improvement of dentitions, portions of the natural structure, and encephalon size. Another fascinating removal that happened with the prior australopithecines ( missing connections ) was the passing of a major eyetooth tooth. In the common state it has been seen that enormous eyetooth dentition in male mandrills when appeared to pirates, has deflected such quicken creatures as Canis familiariss and chetah. In this manner, enormous eyetooths are somewhat beneficial and imperative to ensure a gathering of invigorate creatures, and especially towards ground-living quicken creatures. Not terrible, but not great either for what reason did the early missing connections who preeminent brushed the detached planes of Africa non hold large eyetooths? As proposed by Montagu, â€Å" it would look that the security of the gathering must hold moved from dentitions to apparatuses right off the bat in the improvement of the man-primates and well before the visual part of the signifiers that have been found in relationship with rock devices † . Moreover, the incisors of the man-gorilla have changed and decrease, since their dentition not, at this point must prehend and draw things, which have clearly been supplanted by their authorities. Morphologic modifications in the dentitions are more noteworthy than just an adjustment in size. Huge eyetooths are utilized for more than appear, they were utilized for battling, drawing, tossing and prehending an adversary, and to back up such activities, enormous musculuss in the jaw, caput and cervix was vital. In this way, when the guide of certain old profitable characteristics is not, at this point required, a morphological change in more than only the dentition happens, a general morphological adjustment is popular. Changes in the morphology of the face, and temple edges can other than be clarified through the modification in human instinct. A crucial status for work powers to shape in cultural gatherings was to hold a concealment of rage, and the un-controlling push to first topographic point in the chain of importance of laterality.

21 Of Your Favorite Books That Have Made Your Work Life Better

21 Of Your Favorite Books That Have Made Your Work Life Better This Riot Recommendation is sponsored by HarperOne, an imprint of HarperCollins Publishers and publisher of The Weekend Effect by Katrina Onstad. Digging into the history, the positive psychology, and the cultural anthropology of the idea of a weekend, journalist Katrina Onstad, pushes back against our culture of all-work-no-fun, and follows the trail of people, companies and countries who are vigilantly protecting their weekends for joy, adventure, and most importantly, for meaning. Readers of The Happiness Project, All Joy and No Fun, and Thrive will find personal and business inspiration in this well-researched argument to save and savor the weekend, and as a result, save ourselves. A well-lived weekend, filled with face-to-face socializing, idleness, and nature, is the gateway to a well-lived life. Break out that bullet journal, center yourself, and open that book. You know, the one that keeps your nine-to-five from going off the rails. We asked you to share your favorite books that have made your work life better, and you responded. Here are 21 of your favorites! The 7 Habits of Highly Effective People by Stephen R. Covey The Road Less Traveled, Timeless Edition: A New Psychology of Love, Traditional Values and Spiritual Growth by M. Scott Peck Quiet: The Power of Introverts in a World That Cant Stop Talking  by Susan Cain Strengths Finder 2.0 by Tom Rath The Overworked American: The Unexpected Decline Of Leisure by Juliet Schor Habit Stacking: 127 Small Changes to Improve Your Health, Wellness, and Happiness by S.J. Scott You Are a Badass: How to Stop Doubting Your Greatness and Start Living an Awesome Life by Jen Sincero Now, Discover Your Strengths by Marcus Buckingham and Donald O. Clifton First, Break All The Rules: What the Worlds Greatest Managers Do Differently by Jim Harter Who Moved My Cheese?: An Amazing Way to Deal with Change in Your Work and in Your Life by Spencer Johnson and Kenneth Blanchard The Mythical Man-Month: Essays on Software Engineering by Frederick P. Brooks, Jr. Blink: The Power of Thinking Without Thinking by Malcom Gladwell Eat That Frog!: 21 Great Ways to Stop Procrastinating and Get More Done in Less Time by Brian Tracy The Power of Positive Thinking by Dr. Norman Vincent Peale Get Over Your Damn Self: The No-BS Blueprint to Building a Life-Changing Business by Romi Neustadt From Novice to Expert: Excellence and Power in Clinical Nursing Practice by Patricia Benner The Trusted Advisor by David H. Maister and Charles H. Green Girl Code: Unlocking the Secrets to Success, Sanity, and Happiness for the Female Entrepreneur by Cara Alwill Leyba Getting Things Done by David Allen Productivity for Creative People by Mark McGuinness The Anti 9-to-5 Guide: Practical Career Advice for Women Who Think Outside the Cube by Michelle Goodman

La Nina Definition, Causes, and Impacts

Spanish for little girl, La Nià ±a is the name given to the large-scale cooling of sea surface temperatures across the central and equatorial Pacific Ocean. It is one part of the larger and naturally occurring ocean-atmosphere phenomenon known as the El Nià ±o/Southern Oscillation or ENSO (pronounced en-so) cycle. La Nià ±a conditions recur every 3 to 7 years and typically last from 9 to 12 months up to 2 years. One of the strongest La Nià ±a episodes on record was that of 1988-1989 when ocean temperatures fell as much as 7 F below normal. The last La Nià ±a episode occurred during late 2016, and some evidence of La Nià ±a was seen in January of 2018. La Nià ±a vs. El Nià ±o A La Nià ±a event is the opposite of an El Nià ±o event. Waters in the equatorial regions of the Pacific Ocean are unseasonably cool. The cooler waters affect the atmosphere above the ocean, causing significant changes in climate, though usually not as significant as the changes that occur during an El Nià ±o. In fact, the positive effects on the fishing industry make La Nià ±a less of a news item than an El Nià ±o event. Both La Nià ±a and El Nià ±o events tend to develop during the Northern Hemisphere spring (March to June), peak during late fall and winter (November to February), then weaken the following spring into summer (March to June). El  Nià ±o (meaning the Christ child) earned its name because of its usual appearance around Christmas time. What Causes La Nià ±a Events You can think of La Nià ±a (and El Nià ±o) events as water sloshing in a bathtub. Water in the equatorial regions follows the patterns of the trade winds. Surface currents are then formed by the winds. Winds always blow from areas of high pressure to low pressure; the steeper the gradient difference in the pressure, the faster the winds will move from highs to lows. Off the coast of South America, changes in air pressure during a La Nià ±a event cause winds to increase in intensity. Normally, winds blow from the eastern Pacific to the warmer western Pacific. The winds create the surface currents that literally blow the top layer of water of the ocean westward. As the warmer water is moved out of the way by the wind, colder waters are exposed to the surface off the western coast of South America. These waters carry important nutrients from deeper ocean depths. The colder waters are important to fishing industries and the nutrient cycling of the ocean. How La Nià ±a Years Differ During a La Nià ±a year, the trade winds are unusually strong, leading to increased movement of water towards the western Pacific. Much like a giant fan blowing across the equator, the surface currents that form carry even more of the warmer waters westward. This creates a situation where the waters in the east are abnormally cold and the waters in the west are abnormally warm. Because of the interactions between the temperature of the ocean and the lowest air layers, the climate is affected worldwide. Temperatures in the ocean affect the air above it, creating shifts in climate that can have both regional and global consequences. How La Nià ±a Affects Weather and Climate Rain clouds form as a result of the lifting of warm, moist air. When the air doesnt get its warmth from the ocean, the air above the ocean is abnormally cool above the eastern Pacific. This prevents the formation of rain, often needed in these areas of the world. At the same time, the waters in the west are very warm, leading to increased humidity and warmer atmospheric temperatures. The air rises and the number and intensity of rainstorms increase in the western Pacific. As the air in these regional locations changes, so too does the pattern of circulation in the atmosphere, thereby affecting climate worldwide. Monsoon seasons will be more intense in La Nià ±a years, while the western equatorial portions of South America may be in drought conditions. In the United States, the states of Washington and Oregon may see increased precipitation while portions of California, Nevada, and Colorado may see drier conditions.

When to Consider Planting a Flowering Dogwood Tree

Flowering dogwood is the state tree of Virginia and Missouri and the state flower of North Carolina. It is an extremely popular flowering tree in American landscapes, is beautiful in every season and  a sturdy tree  that can be grown in most yards. Flowering dogwood opens white flowers in April, usually before the leaf display, and will show off and enhance any spring  landscape. If planted on a hospitable site and under a canopy of larger trees, the tree grows fast, sleek and slim -- but it  will be  less sleek and more husky when grown in open sun. Unfortunately, the tree is  too often planted on dry, sunny and alkaline soils and the grower misses its full potential. Habit and Planting Dogwood grows readily from seed but is not easy to transplant. You  will do best by buying a potted  tree at your garden center or bare-root tree at  a nursery.  You can buy bulk bare-root stock at very reasonable prices from the Arbor Day Foundation if you are a member. Always move dogwood with a complete root ball in the early spring and place the transplant a little high in the planting hole. Understory dogwood is a medium tree of about 40 feet with wispy stems. The dogwood occupies a large eastern north-south range in North America -- from Canada to the Gulf of Mexico. The tree is not very hardy if planted beyond its genetic home region so pick a local variety. Strong Cultivars There are white, red and blended versions of flowering dogwood.  Some of the most popular  dogwood cultivars are Cherokee Chief, Cherokee Princess, First Lady, Rubra, New Hampshire, and  Appalachian Spring. Many of these can only be found in local nurseries in the region  where the cultivar does best. Flowering dogwood is hardy through zone 5.

Sports Teams Regulating Social Networking Free Essays

Disputes are arising between new media usage and sports teams/leagues. Many of these disagreements are because of new media outlets such as but not limited to Facebook, Twitter, Blogs, and youTube. The sports teams are trying to regulate the usage because they want to profit from the media. We will write a custom essay sample on Sports Teams Regulating Social Networking or any similar topic only for you Order Now Their profit comes from their own in-house media operation and, as in the case of the NFL, operating their own cable channel. When non-regulated media is available to the public the sports teams risk losing a profit and having negative press. Benjamin Hickman analyzes, in the Old Law, New Technology: The First Amendment’s Application When Sports Teams and Leagues Attempt to Regulate New Media, if the First Amendment can dictate to what extent sports teams may regulate the use of the new media. Across the Pacific in Australia Brett Hutchins and David Rowe examine their countries media crisis between sports teams and media. Reconfiguring Media Sport for the Online World: An Inquiry into â€Å"Sports, News, and Digital Media† comprehensively states that with the growth of technology attitudes towards media usage need to develop with it. Media is being infused into every aspect of our lives, especially entertainment arenas like sports. For a sports team to not allow or restrict media coverage may only be holding the organization back. Allowing other teams, sports, and entertainment outlets to take center stage and the valuable attention of fans and audiences. The younger audiences now want new mediums like blogging. Blogging is popular among sports fans and sports related media. The new wave of communication technology was sudden and Brad Shultz and Mary Lou Sheffer suggests that sports media isn’t ready for the change in Left Behind: Local Television and the Community of Sport. Research Article 1 – Old Law, New Technology: The First Amendment’s Application When Sports Teams and Leagues Attempt to Regulate New Media Benjamin Hickman examines the Fist Amendment’s role to whether sports teams and leagues can regulate the use of new media by fans and the press at sports events. Hickman examines the current Fist Amendment framework explaining the influence of new media on both sides. Hickman first reveals Brian Bennett’s story, a reporter for The Courier-Journal in Louisville. Bennett blogged in real time, in 2007, about a baseball game at the University of Louisville. Bennett was immediately ejected from the press box and his press credential was revoked. â€Å"Reporters covering our championships may blog about the atmosphere, crowd and other details during a game but may not mention anything about the game action. Any reference to game action in a blog or other type of coverage could result in revocation of credentials,† an NCAA official said in a statement to The New York Times. This is an attempt for the sports teams to have control. With the rise of new media their exposure had become exposed. Hickman observes how sports teams feel the need for complete regulation because of the influence that new media has on the press, fans, and the general public. Hickman describes a scenario where fans collaborate together using social networking sites to stage a walk out. This situation would be hard for the sports teams to control if they weren’t able to regulate media usage. This is the risk that sports teams are trying to avoid. By managing all outlets of communication the sports teams are ensuring that they won’t have any bad PR mishaps. Research Article 2 – Reconfiguring Media Sport for the Online World: An Inquiry into â€Å"Sports, News, and Digital Media† The U. S. and Australia are similar in several aspects of media growth. Both Australians and American citizens are browsing websites, social networking, watch online videos, and have a youtube account to name a few. All of these new technologies are becoming increasingly more popular and integral to our everyday life. Brett Hutchins and David Rowe are both University professors who gathered evidence supporting the hypothesis that â€Å"emerging media sport markets are characterized by complex interaction, tense competition, and awkward overlaps between broadcast media and networked digital communications. This situation has disturbed the established media sport order and destabilized pivotal organizing categories, including the definition of â€Å"sports news† (Hutchins). Hutchins and Rowe concluded that the fierce competition between news media outlets, fans, and sports organizations are because of the profit gained when audiences are watching. Sports teams used to not worry about coverage of their game because there was only one source used and available. However, with mobile technology this is becoming increasingly harder. Sports organizations in Australia and the U. S have been trying to adhere by every restriction imaginable so that their profits won’t suffer. In seeking to attract as many users as possible to their sites, sports organizations were accused by media organizations of unfairly restricting the online activities of the news media and journalists and, in the process, attempting to dictate the shape, content, and even definition of news† (Hutchins). Research Article 3 – Left Behind: Local Television and the Community of Sport Brad Shultz and Mary Lou Sheffer explain the technological shift in the sports world through their qualitative and quantitative data. They discovered that local television stations are not engaged in sports blogging and see little value in it. This may be the sign of traditional sports coverage changing and the sports community acting too reluctant to change. â€Å"This resistance to change may be an indication that local sports television is abdicating its traditional role in the community of sport, which has primarily been defined as the provider of local sports news to local sports audiences† (Shultz). The defense against new media changes were apparent in both the qualitative and quantitative data. Their study asked professional journalists associated with a local media outlet in the sports section 15 questions and an open ended question asking their opinion on sports blogging. Results showed that out of 654 television stations currently offering a local sports segment within a newscast, 83 stations were involved in blogging (13%). This would seem to indicate, at least at the current time, that local television stations are not heavily investing in blogging in their sports content† (Shultz). Hickman claims to look at all sides and opens up with a compelling story about a journalist ousted by blogging, however, he defends the sports teams side almost completely, with a resolution of new media will cause dilemmas but in the end sports teams can regulate at their own discretion. To the extent that sports teams and leagues are seeking to protect potential sources of revenue, the First Amendment is unlikely to stand in the way. If, however, they begin regulating new media’s use to prevent negative publicity from going viral, it is far from certain whether such action will survive First Amendment scrutiny. † Hutchins and Row’s facts started broad and then built up to the root of the problem, sports teams wanted the most attention of fans and audiences. However, the news media outlets are competition and now the burgeoning forces of the average fan on YouTube which pumps out unpredictably one hit wonders ever week. Hutchins and Rowe first lay out the challenges each group face: â€Å"sports organizations want to maintain or improve the value of broadcast rights, contracts; broadcasters struggle to establish complementary and attractive online sites and distribution; while fans and Users Access quality sports news and information in the face of plentiful online choice. When seeing every sides challenges and needs it allowed equal opportunity for all opinions. The data collected in this research article was very thorough and answered statistical questions not answered in the other two articles. Shultz and Sheffer were able to compile their findings using theoretical and industry rationales which revealed the sports organizations employees motives, and even fears. â€Å"The media landscape has changed so drastically in the past few years that it has created an environment of tremendous uncertainty† (Shultz). These insights are exceptionally informative and allowed a balanced understanding of all of the possible outcomes. Brian Bennett, a journalist who has gotten caught in the crossfire, must be especially confused because all he did was blog; which sounds harmless. However, the current framework allows sports teams and leagues to regulate most of the speech at sports events. The reason why is because they grant exclusive rights to TV and radio stations, sell ads, and require reporters to have credentials. A few years ago, before social networking, this worked out fine and these regulations were not questioned. Although many are starting to question the current framework because of the fans and press easy accessibility to communicate online. Since the sports teams are trying to control every speck of correspondence about themselves when do we, as a people, have freedom of speech. â€Å"Professional sports teams and leagues enjoy the luxury of regulating speech without constitutional constraints because the First Amendment does not apply to them. Thus, from a First Amendment perspective, privately owned sports teams and leagues enjoy considerable freedom to regulate speech at sports events† (Hickman). This is allowing each sports team have the right to be notified when a comment is made about themselves. I feel that this shouldn’t be allowed and unless formally publishing your opinions, no one should be able to control that. The U. S. has the constitution in which is the First Amendment, in striving to protect and better the lives of each citizen. However, once again the U. S. as skewed the meaning of the document to benefit the conglomerate; this time being sports organizations. Hutchins and Rowe simply explains that the government should not intervene and that each sports organization that wants to be involved with the new media craze should enter at their own risk. They also completely denounce sports and news media to be the same content. â€Å"In the case of both groups, news is treated as a malleable categ ory, reflecting the self interest and identity of the speakers. Sports are demanding a rigid, content-driven definition of news defined in terms of time, features, and repetition. This formulation effectively divorces the technical characteristics of footage from any social and political function achieved by news, and ignores the fact thateffective journalism requires flexibility when responding to changing social conditions, commercial considerations, and technologies† (Hutchins). The data collected by Shultz and Sheffer show a side that the other two research articles didn’t. This is fear of change; their quantitative research unmasked a community of life long careers used to doing the same thing and not looking for anything else. ‘Sports is one of the last areas of TV where people do things the way they’ve always done them,’’ says television executive Elliott Wiser, â€Å"[Today] you have to have a new approach’’(Shultz). Unfortunately, those who ignore the new media changes will be left behind. â€Å"The ‘‘do something now’’ attitude reflects the new media environment of an e mpowered audience. Interactive communication, participation in the sports dialogue, and the ability to create and distribute content have combined to make the consumer much more demanding in the evolving community of sport† (Shultz). How to cite Sports Teams Regulating Social Networking, Papers

The Impact of Student Employment free essay sample

The idea that college students who work on the side are at a disadvantage is almost quaint. Not because theres no evidence that spending many hours on things other than academics can impair students such evidence does exist but rather because the days are long past when many college students had a choice but to work. As tuitions have risen and more and more undergraduates are enrolling later in life, nearly half of all full-time students and 80 percent of part-time students work numbers that are likely only to grow in the future. Given that reality, the more college officials and higher education researchers know about how working affects students academic performance the better. And among the many sessions at last weeks meeting here of the Association for Institutional Research about what seemed to be an unofficial theme what works and doesnt in retaining students were two that sought to provide a more nuanced look at the impact of different amounts and kinds of work on first-year college students grades and other educational experiences. We will write a custom essay sample on The Impact of Student Employment or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page The studies, whose authors include some of the most recognized names in research on students, offer somewhat conflicting findings, but combine to leave the overarching impression that its a vast oversimplification to assume that work is necessarily bad for students academic performance and engagement. When youre talking about throwing a factor into the very complicated soup that is higher education, its a little oversimplified to say that one thing should affect college students across the board, said Mark H. Salisbury, a research assistant and doctoral student at the University of Iowa who presented one of the two studies at the institutional researchers meeting. It makes more sense that work could have positive effects on one thing and negative on another, and that it would affect different kinds of students differently. And thats what we find. One of the two studies, which is based on data from the National Survey of Student Engagement, looked at how various amounts of on- and off-campus work directly influenced students self-reported grades and indirectly affected their levels of engagement in academic activities. Consistent with the conventional wisdom, said Gary R. Pike, lead author of the study, working more than 20 hours a week has a negative impact on students grades, whether the the employment is on campus or off. Students who work 20 hours or less, on campus and off, report roughly similar grades as do students who do not work at all. But the indirect relationships between employment and grades, as indicated by students levels of engagement in educationally purposeful activities, are more complicated, said Pike, executive director of information management and institutional research and associate professor of higher education and student affairs at Indiana University-Purdue University at Indianapolis. Students who work 20 hours or less a week on campus report higher levels on all five levels of engagement used by Pike and his co-authors, Indiana Universitys George D. Kuh and Western Kentucky Universitys Ryan Massa-McKinley, measurements that included such things as student-faculty interaction and engaging in active and collaborative learning. Working 20 hours or less off campus strengthens students performance on two of the five engagement levels, while students who work 20 hours or more, on campus or off, did tend to be more engaged than students who did not work at all, said Pike. That is likely to be because such students have developed strong time management skills, Pike said. When combining the direct and indirect impact on grades, though, working more than 20 hours a week on campus or off negatively affects students academic performance, as the significant time that students spend working ultimately drags down their grades. But for students who worked less than 20 hours a week, where they worked was an important differentiator, Pike said, with those who worked on campus reporting a net positive gain in grades, while those who worked off campus felt a significant negative effect. The implication of the results, the studys authors suggest, is that creating meaningful work experiences for students on campus is a key element in an overall strategy designed to foster student achievement and success. That is a challenge on many campuses, though, as many colleges have relatively few such opportunities, Pike said. He speculated that many campuses may be feeling pressure, as the economy turns down, to transform part-time opportunities for students into full-time jobs to improve efficiency. Looking Beyond Grades The second study on which Salisbury worked with Ernest T. Pascarella and Ryan D. Padgett, colleagues at the University of Iowas Center for Research on Undergraduate Education sought to examine the impact of work on things other than pure academic performance, in the recognition that colleges are increasingly being judged by a broader series of outcomes for their students. Using data collected as part of the Wabash National Study of Liberal Arts Education, the researchers looked at how students who put varying hours into on- and off-campus worked fared on measures such as critical thinking, moral reasoning, socially responsible leadership, and psychological well being. While this study, like Pikes, found some negative effects of working off-campus more than 20 hours a week for instance, bringing down students performance on critical thinking it also found that doing so had a positive effect on students psychological well being, and that students who worked off campus also trended positively on leadership skills. Work doesnt really have much of a negative effect on cognitive-type outcomes like moral reasoning and critical thinking until you get to a ton of hours, said Salisbury. But work has a positive effect on things like psychological well being and leadership even when youre working a ton of hours. But there were significant differences in the impact on students who came into college with varying academic abilities, with much more harm done to students who scored lower on college entrance exams. Working on campus between 1-10 hours a week had a positive effect on critical thinking for high-ability students but a strong negative effect for low -ability students, the study found.

Design and Fabrication of a Robot for Training Essays

Design and Fabrication of a Robot for Training Essays Design and Fabrication of a Robot for Training Essay Design and Fabrication of a Robot for Training Essay MOI UNIVERSITY SCHOOL OF ENGINEERING DEPARTMENT OF MECHANICAL AND PRODUCTION ENGINEERING COURSE CODE: PRD5 80 COURSE TITLE: FINAL YEAR PROJECT PROJECT TITLE: DESIGN AND FABRICATION OF A ROBOT FOR TRAINING PRESENTED BY: Dennis Chesire PRESENTED TO: DR. A. N. MAYAKA Submitted To The Department Of Mechanical And Production Engineering In Partial Fulfillment Of The Requirements For The Award Of Bachelor Of Technology Degree In Mechanical And Production Engineering Academic year 2007/2008 DECLARATION I hereby declare that this is my original work and has not been submitted for any award in any institution or university. SIGN †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ DATE †¦ Dennis Chesire CERTIFICATION I have read this project report and approved its presentation for examination. SIGN †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ DATE †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Supervisor DEDICATIONS I dedicate this design work to my family and all my friends for their inspiration and assistance even in times of difficulty. ACKNOWLEDGEMENT The completion of this project would have been impossible without the help received from many people. First I would like to thank the Almighty Father in heaven for having brought me this far. To God be glory forever and ever. I would also like to thank Dr. A. N. Mayaka for the priceless moral and technical advice he gave throughout the design process of this project. Thank you for the shared documents and materials and the precious time you gave, out of your ever busy schedule. I acknowledge the assistance of the Head of Department, Dr. Boaz Korir for coming to my aid when Dr. A. N. Mayaka was away. I would like to acknowledge all my lecturers for the tireless effort they have put in my training. Mr. Kimutai the effort you put towards this project cannot go unmentioned. I want to also extend my sincere appreciation to all the Mechanical Engineering Department technicians, specially mentioning Mr. Akwiri and Mr. Oduor My parents, I will not forget your self sacrifice in an effort to support me all through my college life. Last but not least, all my classmates, I am very grateful. May God bless you all. ABSTRACT In this project an introduction on the need of adequate training on automation in higher learning institutions is looked into in a systematic way. First there is a general introduction of robotics in chapter one, robot classifications and robot applications is in chapters three and four. Chapter five consists of the design alternatives and their analysis. General introduction on component manufacture is given in chapter six. Cost analysis and the conclusion and recommendations are done in chapters seven and eight. TABLE OF CONTENTS DECLARATIONi Supervisor DEDICATIONSi DEDICATIONSii ACKNOWLEDGEMENTiii ABSTRACTiv TABLE OF FIGURESviii LIST OF TABLESix LIST OF APPENDICESx 1. 0 CHAPTER ONE1 1. 1 GENERAL INTRODUCTION1 1. 2 PROBLEM STATEMENT2 1. 3 JUSTIFICATION3 1. 4 SCOPE5 1. 5 OBJECTIVES6 1. 5. 1 General objective6 1. 5. 2 Specific objectives6 1. 6 METHODOLOGY7 1. 6. 1 Source of data7 1. 6. 2 Target market for design7 1. . 3 Viability7 CHAPTER TWO8 2. 0 LITERATURE REVIEW8 2. 1 Background8 2. 1. 1 What is a Robot? 8 2. 2 ROBOT GENERATIONS10 2. 3 Robot systems10 2. 4 CLASSIFICATION OF ROBOTS11 2. 4. 1 Classification based on structural configuration and robot motion. 11 2. 4. 1. 1 Revolute (jointed arm) robot12 2. 4. 1. 2. Polar (spherical) robot13 2. 4. 1. 3 Cylindrical ro bot14 2. 4. 1. 4 Cartesian (rectangular) robot, sliding type14 2. 4. 1. 5 Cartesian (rectangular) robot, gantry-type14 2. 4. 1. 6. SCARA- type robot15 2. 4. 2 Basic robot motions16 2. 4. 2. 1 Six degrees of freedom16 2. 4. 3 Classification based on path control17 2. 4. 3. Point-to-point (PTP) control17 2. 4. 3. 2Continuous path (CP) control18 CHAPTER THREE19 3. 0 ROBOT APPLICATIONS19 3. 1 General application characteristics19 3. 2 APPLICATION AREAS OF INDUSTRIAL ROBOTS20 3. 2. 1 Material Transfer21 3. 2. 2 Machine Loading21 3. 2. 3 Welding23 3. 2. 3. 1Spot welding23 3. 2. 3. 2 Arc welding24 3. 2. 4 Spray Coating25 3. 2. 5 Processing Operations27 3. 2. 6 Assembly28 3. 2. 7 Inspection29 CHAPTER FOUR31 4. 0TRAINING31 4. 1 INTRODUCTION31 4. 2 APPLICATION OF ACQUIRED SKILLS31 4. 2. 1 Middle managers31 4. 3 TREND IN KENYA31 4. 4 REASONS WHY KENYAN FIRMS NEED WELL TRAINED GRADUATES FROM LEARNING INSTITUTIONS33 4. TYPES OF TRAINING34 5. 0 DESIGN ANALYSIS36 5. 1 DESIGN ALTERNATIVES36 5. 1. 1 Comparison of alternatives38 5. 2 SPECIFICATIONS39 5. 2. 1 Task Specifications39 5. 2. 1. 1 Performance Specifications39 5. 2. 1. 2 Design Specifications39 5. 2. 1. 3 Dimensional Specifications40 5. 3 EXTENT OF THE ANALYSIS42 5. 4 GRIPPER MECHANISM ANALYSIS43 5. 4. 1 Gripping Force44 5. 4. 2 Torque required to produce desired clamping force-Power screws46 5. 4. 3 Power Required49 5. 4. 4 Pins50 5. 5 HOLLOW SECTIONS51 5. 6 BELT51 5. 6. 1 Dimensions of belt cross sections52 5. 7 FASTENERS53 5. 8 WASHERS54 5. 9 COUPLINGS54 5. 9. 1 Flange coupling54 5. . 2 Derivation of flange coupling formula55 5. 10 SAFETY FACTORS57 5. 11 KEYS AND KEY-WAYS58 5. 11. 1Wood ruff key58 CHAPTER SIX59 6. 0COMPONENT PRODUCTION59 6. 1 PARAMETERS FOR OPTIMUM PRODUCTION59 6. 1. 1 Product Analysis59 6. 1. 2 Operation Analysis59 6. 1. 3 Machine Analysis59 6. 1. 4 Operator Analysis59 6. 2 RESOURCE REQUIREMENT59 6. 2. 1 Capital Resources60 6. 2. 2 Tooling Resources60 6. 2. 3 Material Resources60 6. 2. 4 Human Reso urces60 6. 2. 5 Service Resources60 CHAPTER SEVEN61 7. 0 COST ANALYSIS61 CHAPTER EIGHT63 8. 0 CONCLUSION AND RECOMMENDATIONS63 8. 1 CONCLUSION63 8. 2. 1 Recommendations for the Government65 8. 2. Recommendations for the university66 REFERENCES67 TABLE OF FIGURES Figure 1. 0: CAD/CAM layout 6 Figure 2. 1: Revolute Robot 14 Figure 2. 2: Cylindrical and Polar Robot 15 Figure 2. 3: Cartesian Robot17 Figure 2. 4: Basic Robot Motions18 Figure 2. 5: Typical Wrist Articulations19 Figure 5. : Alternative Design 138 Figure 5. 2: Alternative Design 239 Figure 5. 3: Shape of Object to be grasped40 Figure 5. 4: Determination of Principal Dimensions41 Figure 5. 5: Gripper mechanism44 Figure 5. 6: End section of Gripper45 Figure 5. : Power Screw Motions48 Figure 5. 8: Woodruff Key59 LIST OF TABLES Table 7. 1 Cost analysis 62 LIST OF APPENDICES APPENDIX I: Glossary Of Robotic Terms APPENDIX II: Nominal cross-sectional dimensions of Standard V-belts APPENDIX III: Typical coefficients of static frict ion values (Dry conditions) APPENDIX IV: Chain Dimensions and Breaking Loads of Base Chains APPENDIX V: Woodruff Keys APPENDIX VI: Straight Sided Splines for Machine Tools-4 splined APPENDIX VII: Single Thrust Ball Bearings 1. 0 CHAPTER ONE 1. 1 GENERAL INTRODUCTION Robotics is a term describing a new academic and industrial discipline. Robotics is now a well established field of endeavor both in industry and research laboratories. There is a danger that the word may be used even in areas where it is inappropriate, so knowing precisely what a robot is, how it is controlled and how it may be used in specific applications is of the highest importance. As a result of the great advances of the last few years many industrial processes have become largely automated, with the human operator playing an ever decreasing role. The fully automated and unmanned factory is probably now only a few decades away. 1. 2 PROBLEM STATEMENT Many institutions of higher learning in Kenya have incorporated studies on automation in their teaching curricular for example CAD/CAM. Proper grasp of the underlying principles are best demonstrated to the students within a laboratory. It is in pursuance of this need that an effort is being made through this project to produce an automated cylindrical configuration robot model. 1. 3 JUSTIFICATION In the recent past there has been increasing world-wide competitions and many companies see, the use of computer-assisted production systems as giving them a chance of resolving the conflict of objectives between productivity and flexibility by introducing automation in a flexible manner. But it is not only the production techniques that are undergoing a process of change. Computers are also used to assist the functions that precede, accompany or follow production. The key words of this trend are: Computer Aided Design (CAD), Computer Aided Planning (CAP) and Computer Aided Manufacturing (CAM). CAM means the integration of all planning, controlling, executing and monitoring functions of the production process on the basis of a computer network. Efforts directed towards automation and integration change the work content and working conditions of production. However, the success of a company’s commitment will be determined not only by selecting and applying the best technology but also ensuring that people and machines work together in the best possible manner. It is in this context that training is of paramount importance. There is therefore a need to introduce robotics to all practicing and training engineers so that the technology may be embraced in Kenya to aid in the attainment of Vision 2030. To attain this, a design of a simple configuration robot to aid in the displaying of the basic principles of robotics to training engineers is of great import. It is with this intention that this project is carried out as a follow up to what has been done previously on the subject. [pic] Figure 1: CAD/CAM Layout (courtesy of Robotics for Engineers Pg 308) 1. SCOPE The project will be limited to the design and fabrication of a pick-and-place robot of the cylindrical configuration type because of its relative simplicity. 1. 5 OBJECTIVES 1. 5. 1 General objective To supplement lecture room discussions on â€Å"automated industrial operations† with laboratory work. 1. 5. 2 Specific objectives i. To study the application of robots world wide ii . To develop and design a model of a simple cylindrical configuration robot for training sessions in the School of Engineering of Moi university iii. To fabricate a model of a simple cylindrical configuration robot using cheap available material 1. 6 METHODOLOGY 1. 6. 1 Source of data Development and design of the cylindrical robot is based on: Study of the available automated systems Review of related literature Inspection of layout of mechanical engineering laboratories at Moi University for compatible principal dimensions of the design Insight into the University curricular for suitability of the design needs 1. 6. 2 Target market for design Universities in Kenya Other higher learning institutions including polytechnics . 6. 3 Viability The completed design is intended for installation at the Moi university laboratories for use in demonstrations to augment theoretical lectures on automation. Other institutions should initially see the need to attach their students at Moi University before eventually buying the product to cut down on their training costs. CHAPTER TWO 2. 0 LITERATURE REVIEW 2. 1 Background The word robot exis ts in many languages an evidence of its recent coinage. The term first came in use during the 1920s and 1930s, following the appearance of a play by the Czech author Karel Capek, called R. U. R. (Rossums Universal Robots), in the play small artificial anthropomorphic creatures strictly obeyed their masters orders. These creatures were called ‘robots’, a word derived from the Czech robota, meaning ‘forced labour’. 2. 1. 1 What is a Robot? A wide spectrum of definitions exists though few manufacturers or users will agree on any. In fact none has been accepted as standard. Since there is no standard for defining or for describing the functions of a robot, it would be helpful if consideration is given to the attempts that have been made to provide one. The British Robot Association (BRA) has defined the industrial robot as A reprogrammable device with a minimum of four degrees of freedom designed to both manipulate and transport parts, tools or specialized manufacturing implements through variable programmed motions for the performance of the specific manufacturing task (Chirouze, 1988 pg 17). The Robotics Institute of America (RIA) defines the robot as A reprogrammable, multi-functional manipulator designed to move material, parts, tools or specialized devices through variable programmed motions for the performance of a variety of tasks. Japan Industrial Robot Association (JIRA) and the Japanese Industrial Committee in the ‘Glossary of terms for industrial robots’ defines the robot at various levels as Manipulator: a machine which has functions similar to those of the human upper limbs, and moves the object spatially, from one location to the other. Playback robot: a manipulator which is able to perform an operation by reading off the memorized information for an operating sequence, including positions and the like, which it learned by being taken manually through the routine beforehand. Intelligent robot: a robot which can determine its own behaviour /conduct through its functions of sense and recognition (Chirouze op cit). Computer Aided Manufacturers International (CAM-I) in the USA defines the humanoid aspects of the industrial robot as A device that performs functions ordinarily ascribed to human beings, or operates with what appears to be almost human intelligence. The definition supplied by the Concise Oxford Dictionary is ‘Apparently human automaton, intelligent and obedient but impersonal machine. ’ Another suggestion defines a robot in its developed form as An automatic machine with a certain degree of autonomy, designed for active interaction into the environment (Francis Sieglera, 1987 pg 2-4). 2. 2 ROBOT GENERATIONS There are several more or less clearly distinguished generations of industrial robots. The first generation robots are fixed-sequence robots which can repeat a sequence of operations once they have been programmed to do so. To carry out a different job, they have to be reprogrammed, often by â€Å"training† or â€Å"education† The second-generation robots are equipped with sensory devices which allow a robot to act in a not-completely defined environment, e. g. ick up a part that is misplaced from its ideal position, pick up a needed part from a batch of mixed parts, recognize a need to switch from one succession of motions to another etc. The third-generation robots which are emerging now have the intelligence to allow them to make decisions, such as ones necessary in assembly operations (assembling a prop er combination of parts; rejecting faulty parts; selecting necessary combinations of tolerances etc. ) Robots of first and so called â€Å"1. 5† generation (with some sensing devices) constitute the overwhelming majority of robots now in use and production (Francis Sieglera op cit). . 3 Robot systems However, regardless of the generation, industrial robots are built of three basic systems: The â€Å"mechanical structure† consisting of the mechanical linkages and joints capable of various movements. Additional movements are made possible by end effectors fitted at the arm end. The â€Å"control system† which can be of â€Å"fixed† or â€Å"servo† type. Robots with fixed control systems have fixed (but, possibly, adjustable) mechanical stops, limit switches, etc. , for positioning and informing the controller. Servo-controlled robots can be either point to point (PTP), where only specified point coordinates are under control and not the path between them, or continuous path (CP) controlled, thus achieving a smooth transition between the critical points. The â€Å"power unit(s),† which can be hydraulic, pneumatic, electrical, or their combination, with or without mechanical transmissions. 2. 4 CLASSIFICATION OF ROBOTS Robot classification may be considered on the following basis: 1. Structural configuration and robot motion 2. Trajectories based on motion control 3. Performance characteristics of the robot. 2. 4. Classification based on structural configuration and robot motion. For this classification, three basic motions in the operation of robots need to be distinguished. Swivel motion- This is a rotation about the longitudinal axis of a link between two joints. Bending motion-this is a rotation about the transverse axis in the joint. Prismatic motion-this is a linear motion in t he direction of the longitudinal axis, either extensional or constructional (Eugene, 1988 pg 127-128). According to robots joint movements there are the following well distinguished basic robot configurations: i. Revolute (jointed arm) robot i. Polar (spherical)robot iii. Cylindrical robot iv. Cartesian (rectangular) robot, sliding-type v. Cartesian (rectangular) robot, gantry-type vi. SCARA- type robot 2. 4. 1. 1 Revolute (jointed arm) robot This is the type that best simulates a human arm, and is often referred to as an anthropomorphic robot. Because of this it is more easily adapted to an existing human workstation than any other type of robot. [pic] Figure 2. 1: Revolute Robot (Courtesy of; Reinventing Man, Pg 48) The revolute robot consists of three major rotary joints acting as the waist and elbow mounted at the end of the shoulder link. A typical example is Asea (IRb-6 Sweden) 2. 4. 1. 2. Polar (spherical) robot This robot rotates about the axis of its waist on the base. The second axis is a horizontal rotary joint, allowing the arm to rotate in a vertical plane. Making use of all the axes, the arm can sweep through a partial sphere. This mathematically corresponds to a polar coordinate system, thus this kind of robot is classified as polar. The third degree of freedom is provided by a prismatic joint built into the arm which allows it to move in and out. The robot can sweep through partial spheres of radii depending on the length of the prismatic joint. A typical example is Unimation (series 1000, 2000, 4000, US). [pic] Figure 2. 2: Cylindrical and Polar robot (Courtesy of; Reinventing Man, Pg 47) 2. 4. 1. 3 Cylindrical robot This robot consists of a base, a horizontal arm and a prismatic joint built into the horizontal arm. The whole base can move up and down. The horizontal arm swivels around the vertical column, describing a partial cylinder in space. This mathematically corresponds to a cylindrical coordinate system, thus this kind of robot is classified as cylindrical. A typical example is Prab (Model E, FA, FB, FC and Model G Series, Norway). 2. 4. 1. Cartesian (rectangular) robot, sliding type There are three perpendicular traversing axes, realized by an up/down, a left/right, and a forward/backward moving prismatic joint. This mathematically corresponds to a Cartesian coordinate system, thus this kind of robot is classified as Cartesian. Despite the fact that this robot is of high precision, it is not referred for many appli cations because of its difficult adaptability to the existing human- operated workstations. A typical example is DEA robot (Digital Electronic Automation SpA, Model Pragma A3000, Italy). 2. 4. 1. 5 Cartesian (rectangular) robot, gantry-type This type of robot has the same structure as the sliding type Cartesian robot. The only difference is that it has a gantry for keeping the robot in sliding operation. A typical example is IBM (7565, US) [pic] Figure 2. 3: Cartesian robot (Courtesy of; Reinventing Man, Pg 46) 2. 4. 1. 6. SCARA- type robot New robot kinematic configurations can be obtained by combining the properties of the basic robot representatives outlined above. For instance if the revolute and cylindrical robot kinematics are combined, the result will be a new type of robot called SCARA, where SCARA stands for Selective Compliance Assembly Robot Arm. Its rotary joints have vertical axes, allowing movement in a horizontal plane, which corresponds to both revolute and cylindrical coordinates. The SCARA configuration has vertical major axis rotations for which the gravitational load, Coriolis and centrifugal forces do not stress the structures as much as they would if the axes were horizontal. This advantage is very important at high speeds and high precision. The best examples are IBM (7535 and 7545. US), Meta Machines (adept one, UK) 2. 4. 2 Basic robot motions Whatever the configuration, the purpose of the robot is to perform a useful task. To accomplish the task, an end effector, or hand, is attached to the end of the robot’s arm. It is this end effector which adapts the general-purpose robot to a particular task. To do the task, the robot arm must be capable of moving the end effector through a sequence of motions and/or positions. [pic] Figure 2. 4: Basic robot motions (courtesy of An Introduction To Robot Technology pg 12) 2. 4. 2. 1 Six degrees of freedom There are six basic motions, or degrees of freedom, which provide the robot with the capability to move the end effector through the required sequence of motions. These six degrees of freedom are intended to emulate the versatility of movement possessed by the human arm. Not all robots are equipped with the ability to move in all six degrees. The six basic motions consist of three arm and body motions and three wrist motions, as illustrated in the figure below for a polar –type robot. These motions are described as follows: Arm and body motions: 1. vertical transverse: up-and-down motions of the arm, caused by pivoting the entire arm about a horizontal axis or moving the arm along a vertical slide 2. radial transverse: extension and retraction of the arm (in-and-out movement) 3. otational transverse: rotation about the vertical axis (right or left swivel of the robot arm) Wrist motions: 4. wrist swivel: rotation of the wrist 5. Wrist bend: up-or-down movement of the wrist, which also involves a rotational movement. 6. Wrist yaw: right- or- left swivel of the wrist. [pic] Figure 2. 5: Typical Wrist Articulations (Courtesy of; Reinventing Man, Pg 49) 2. 4. 3 Classification based on path control There are two basic forms of robot path control: 1. Point-to-point (PTP) control With point-to-point control the robot is programmed to pause at each point to plan the next step in a predetermined manner. Despite the fact that the motion is not controlled between the set points, it usually occurs along a natural path, depending upon the kinematic geometry of the robot. On the other hand the robot under continuous control can follow any arbitrary path accurately. A point-to-point controlled robot offers greater precision in terms of accuracy and repeatability. 2. 4. 3. 2Continuous path (CP) control The continuous path control results in a smoother movement along the defined trajectory but there is a speed penalty, which is a function of the step sizes computed by the master computer in real time using interpolation methods. The penalty may be a 15-25 % speed reduction, resulting in uneconomic control of the process, i. e. the efficiency will be lower compared with the same robot operating in point-to-point control mode. CHAPTER THREE 3. 0 ROBOT APPLICATIONS 3. 1 General application characteristics There are certain general characteristics of an industrial situation which tend to make the installation of a robot economical and practical (Poole, 1989). These include the following. ? Hazardous or uncomfortable working conditions. In job situations where there are potential dangers or health hazards due to heat, radiation, or toxicity, or where the workplace is uncomfortable and unpleasant, a robot should be considered as a substitute for the human worker. This sort of application has a high probability for worker acceptance of the robot. Examples of these job situations include hot forging, die casting, spray painting and foundry operations. ? Repetitive tasks If the work cycle consists of a sequence of elements which do not vary from cycle to cycle, it is possible that a robot could be programmed to perform the task. This is especially likely if the task is accomplished within a limited workspace. Pick and place operations and machine loading are obvious examples of repetitive tasks. ? Difficult handling If the work part or tool involved in the operation is awkward or heavy, it might be possible for a robot to perform the task. Operations involving the handling of heavy work parts are a good example of this case. A human worker would need some form of mechanical assistance to lift the part, which would add to the production cycle time. Some industrial robots are capable of lifting payloads weighing several hundreds (or even more than a thousand) pounds. Multishift operation If the initial investment cost of the robot can be spread over two or three shifts, the labor savings will result in a quicker payback. This could mean the difference between whether or not the investment can be justified. Plastic injection moulding and other processes which must be operated continuously are examples of multis hift robot applications. 3. 2 APPLICATION AREAS OF INDUSTRIAL ROBOTS Industrial robots have been applied to a great variety of production situations (Groover Zimmer, 1984 pg 257). These applications can be divided into the following seven categories: 1. Material transfer 2. Machine loading . Welding 4. Spray coating 5. Processing operations 6. Assembly 7. inspection 3. 2. 1 Material Transfer Material transfer applications are those in which the robot is used to move workparts from one location to another. In some cases a reorientation of the part may be required in this material handling function. Examples of material transfer robot operations include the following: Simple pick and place operations Transfer of workparts from one conveyor to another conveyor (basically a pick and place task) Palletizing operations, in which the robot takes parts from a conveyor and loads them onto a pallet in a required attern and sequence Stacking operations similar to palletizing Loading part s from a conveyor into cartons or boxes (similar to palletizing) Depalletizing operations, in which the robot takes parts which are arranged on a pallet and loads them onto a conveyor Material transfer operations are often among the easiest and most straightforward of robot applications (e. g. pick and place, transfer from conveyor to conveyor). Robots used for these tasks usually possess a relatively low level of technological sophistication. However in other cases the motion pattern can become somewhat complicated. . 2. 2 Machine Loading Machine loading applications are material handling operations in which the robot is required to supply a production machine with raw work parts and/or to unload finished parts from a machine. Machine loading is distinguished from material transfer operation by the fact that the robot works directly with the processing equipment. In material transfer functions it does not. In the typical application the robot will grasp a raw work part from a conv eyor and load it into a machine. In some cases, the robot holds the part in position during processing. When processing is completed, the robot unloads the part from the machine and places it onto another conveyor. Production operations in which robots have been successfully applied to perform the machine loading and unloading function include the following: Die casting Injection moulding Transfer moulding Hot forging Upsetting or upset forging Stamping press operations Machining operations such as turning and milling In die casting and plastic moulding, the robot only unloads the finished parts. For machining processes, the robot both loads and unloads the machine tool. In upsetting and stamping operations, the robot holds the work part while it is being processed by the machine. Some machine loading applications consist of several processing machines in a manufacturing cell, with the robot tending two, three, or even four separate machines. One of the more recent innovations in machine loading applications is to form a flexible manufacturing system using several robots to augment the conveyor system normally used in these production cells. 3. 2. 3 Welding The welding processes are very important application area for industrial robots. The applications logically divide into two basic categories, spot welding and arc welding. 3. 2. 3. 1Spot welding Spot welding is a process in which metal parts (sheets or plates) are fused together at localized points by passing a large electric current through the two parts at the points of contact. The process is implemented by means of electrodes which squeeze the parts together and conduct the current to the point of contact. The typical pair of electrodes have the form of tongs, which can conveniently be mounted on a large robots wrist as the end effector. Using the welding â€Å"gun,† as the electrode assembly is sometimes called; the robot accomplishes a spot weld by means of the following sequence: 1) Position the welding gun in the desired location against the two pieces 2) Squeezing the two electrodes against the mating surfaces 3) Weld and hold, when the current is applied to cause heating and fusion of the two surfaces in contact 4) Release and cool. The electrodes open and sufficient time is allowed to cool the electrodes in anticipation of the next spot weld This is the sequence that has been an ideal task for a point-to- point robot. pot welding has become one of the largest application areas for industrial robots, especially in the automotive industry. 3. 2. 3. 2 Arc welding Several types of continuous arc welding processes can be accomplished by industrial robots capable of continuous-path operation. These processes include gas metal arc welding and gas tungsten arc welding. These kinds of operations are traditionall y performed by welders, who must often work under conditions which are hot, uncomfortable, and sometimes dangerous. Such conditions make this a logical candidate for the application of industrial robots. However, there are several problems associated with arc welding that have hindered the widespread use of robots in this process. First arc welding is a fabrication process often used on low volume products. Hence the economics involved in these cases make the use of any automation difficult, robots included. Second, dimensional variations in the components being arc welded are common. Human welders can compensate for these variations. Robots can not, at least with current technology. Third, human welders are often required to perform their trades in areas which are difficult to access (inside vessels, tanks, ship hulls, etc. . Forth and finally, sensor technologies capable of monitoring the variations in the arc welding process have not yet been fully developed. As a result of these problems, robot arc welding applications have been fairly limited to operations involving high or medium volumes where the components can be conveniently handled and the dimensional variations can be reas onably managed. A typical robotic arc welding station would consist of the following components: A robot capable of continuous path control A welding unit consisting of the welding tool, power source, and the wire feed system A work part manipulator, which fixtures the components and positions than for welding The work station controller is equipped to control the wire feed and arc voltage with the robot’s arm movement the activities of the work part must also be coordinated by the controller. A human worker would be used to load and unload the work parts from the manipulator. There are several advantages attributed to a robot welding station compared with its manually operated counterpart. Among these are the following: Higher productivity Improved safety More consistent welds 3. 2. 4 Spray Coating Many large consumer products and most industrial products require the application of some form of paint. When human workers apply this paint, the most common method is spray painting. However the spray painting process poses certain health hazards to the human operator. Among these are: 1) Fumes and mist from the spr aying operation these create an uncomfortable and sometimes toxic atmosphere 2) Noise from the spray nozzle. This noise is loud and prolonged exposure can impair hearing. 3) Fire hazard. The mist of paint in the air within the factory can result in flash fires. 4) Possible cancer dangers. Certain of the ingredients used in the paint are suspected of being carcinogenic. Because of these health hazards, human workers are unenthusiastic about being exposed to the spray painting environment, and companies have been forced by law enforcement agencies to construct elaborate ventilating systems to protect their workers. For these and other reasons, specialized industrial robots are being used more and more frequently to perform spray painting and related processes. Spray painting requires a robot capable of executing a smooth motion pattern which will apply the paint or other fluid evenly and avoid rums. To accomplish this, the robot is equipped with continuous-path control. The paint spray nozzle becomes the end effector. To teach the robot, the walk through method is commonly employed. An operator-programmer manually leads the robot’s end effector through the desired paint spray path. This defines the motion sequence and relative speed for the work cycle. During playback, the robot repeats the cycle to accomplish the paint spray operation. Among the many advantages of using robots for spray coating applications are the following: 1. Safety: The many safety hazards encountered when human operators perform the spray painting process are reduced. 2. Coating consistency: Once the program is established, the robot will deposit the paint or other coating with the same speed, pattern and spray rate on every cycle. 3. Lower material usage: The robot’s repeatability and consistency reduce wasted paint. Savings in this category seem to range between 10 and 50%. 4. less energy used. This results from reduced ventilation requirements since the human operator is removed from the actual process. 5. Greater productivity: The paint spraying robot can perform the operation faster than its human counterpart. It can also be used at this faster pace for three shifts per day. 3. 2. 5 Processing Operations This is a miscellaneous category in which the robot is used to perform some manufacturing process other than welding or spray painting. Assembly and inspection operations are also excluded, and they are covered in the following sections. Just as in welding and spray painting, the processing operation is performed by specialized tool attached to the robot’s wrist as its end effector. The end effector is typically a powered spindle which holds and rotates a tool such as a drill. The robot will be used to bring the tool into contact with a stationary workpart during processing. In some applications which we will include within this category, the robot’s hand is used for gripping the workpart and bringing it into contact with a tool held in a fixed position. In the latter case, we begin to overlap with the types of machine loading applications covered earlier in this case. Some of the processing operations which have been performed by industrial robots include drilling, riveting, grinding, polishing, deburring, wire brushing, and water jet cutting. 3. 2. 6 Assembly Assembly operations are seen as an area with big potential for robot applications. Batch-type assembly operations seem to offer operations seem to offer the most promise for using robots. The reason for this is based on economics and the technological capabilities of the robot. For mass production assembly, the most economical method involves fixed automation, where the equipment is designed specifically to produce the particular product. A robot would probably be too slow for mass production, and one of the robot’s most important attributes, its programmability, would hardly be used. In batch assembly, there are variations in products and the demand for each product is significantly lower than in mass production. Consequently, the assembly line in batch manufacturing must be capable of dealing with this product variation and the line changeovers that are necessitated. What is basically required for batch production is a flexible assembly system. The term that some companies use for such a system is adaptable-programmable assembly system (APAS), and robot-type arms constitute and important component of these systems. The APAS will be composed of both conventional material handling devices (conveyors, parts feeders, etc) and robot arms probably in an inline arrangement. The robot arms will be used for some parts handling duties, but its main function will be assembly. Robot assembly operation would typically require an extension of the robots material transfer capability. Many sub-assemblies consist of a stack of components on top of a base part. To put together the sub assembly requires the placement of one part on top of the base and then the other part on top of that, and so forth. The robot is certainly capable of this sort of work cycle. Assembly tasks requiring a special skill or judgment which the robot is not capable, would be performed by human workers. The feature of an industrial robot that make it suitable as a component of an APAS line are its programmability and its adaptability. Programmability is required so that a relatively complex motion cycle can be carried out during the assembly operation. Also, the APAS must be capable of storing multiple program sets to facilitate the differences in products assembled on the line. On this sense the system the system would be adaptable to changes in product style. Adaptability is also required in the sense that the assembly system would have to compensate for changes in the environment. These environmental variations include: Variations in the position and orientation of assembly components Out – of- tolerance and defective parts The current state of completion of the sub assembly Detection of human beings or objects intruding on the robot work volume 3. 2. 7 Inspection Like assembly, inspection is a relatively new area for the application of industrial robots. Traditionally, the inspection function has been a very labor intensive activity. The activity is slow, tedious, and boring, and is usually performed by human beings on a sampling basis rather than by 100% inspection. With ever increasing emphasis on quality in manufacturing, there is a trend toward automating the inspection process and toward the use of 100% inspection by machines instead of sampling inspection by human beings. An important role in this area of inspection automation will be played by industrial robots. Robots equipped with mechanical probes, optical sensing capabilities, or other measuring devices can be programmed to perform dimensional checking and other forms of inspection operations. CHAPTER FOUR 4. TRAINING 4. 1 INTRODUCTION General education is received by all during the years spent in school. This is intended to form a basis on which people can build further levels of education and training to suit specific work roles (Timings et al, 1999). As a graduate trainee having first obtained an honours degree in Engineering, on joining a medium or large firm that has suitable training schemes ‘on job’ training will be done and several years of study and training are required so as to attain very high standards. A way needs to be sought to help shorten this period. 4. 2 APPLICATION OF ACQUIRED SKILLS The qualifications and skills gained through the right and relevant training can be applied to various roles of administration in the manufacturing industry. For example; 4. 2. 1 Middle managers These are professionally trained people who are still gaining management training. They are usually university graduates in various disciplines who have passed the qualifying examination of their appropriate professional institution. They assist senior managers by heading the divisions within departments and are to continually update their knowledge of changes in technology 4. 3 TREND IN KENYA In Kenya programmable automation is still at a relatively early stage of development and an even earlier stage of application, but then there is already a discernible trend away from the fragmentation of tasks towards a broadening of technical skills. This trend with the right and timely kind of training will grow stronger and stronger. Among the already discernible trend we have: a) The elimination of the distinction between manual and intellectual work. What is emerging is a division between high-skilled and low-skilled work. b) Need for further training due to the higher skill requirements and the need for flexibility c) Change of manager’s job from one of close supervision of personnel to that of overseeing a complex network of interrelationships within a department and between other departments. d) Decentralization of the functions of management and production control. The work group is being seen as the more desirable form of organization. The challenge in Kenya now lies with the introduction of broad based training at all levels. This will help develop compatible work organization that will bring together programmable automation technology on the one hand and graduates with a broad, general understanding of the production process on the other hand. Graduates need to be well equipped to be able to carry out the challenging tasks, they will find in working environments they will end up in considering the rate at which improved technology is being embraced. 4. REASONS WHY KENYAN FIRMS NEED WELL TRAINED GRADUATES FROM LEARNING INSTITUTIONS The vision 2030 can only be attained if among other reasons, our country can be in a position to manufacture and sell products within and outside the country and still withstand the various forms of competition from products from the economic giants like China and India. Because emphasis has always been on small an d medium sized companies, use of programmable automation needs to be embraced to help these companies to be motivated principally by a desire to keep with technical change so as to remain competitive. This can also help improve technical quality of products and also ensure faster production. Because of new technology and the economic situation, training methods that have been normal practice are gradually disappearing for example lengthy apprenticeships and in-house training. This now calls for many people, particularly the young people to enter into new areas of study either just at the start or throughout the course of their whole career in educational institutions. This will ensure that future recruits to any job won’t need much in-house training. The current needs’ qualifications and skills will gradually decline as well as the current training methods and career opportunities, therefore educational institutions need to ensure that they don’t just end up in redundancy. Training needs also to be done so as to be an assurance of safety. The number of accidents may fall due to improved technology but the severity i. e. the risk of untrained personnel is greater especially during repairing or maintaining of robots. Most future employees need to fully realize all the benefits envisaged from the implementation of new systems all based on technological advancement. This is with the sole objective of attaining improved productivity and efficiency which might not be attained with the conventional manual methods. This sounds a warning to all trainees that no employee will wish to recruit someone with the full knowledge that one is not having, even in the least, knowledge on the latest technology of automation. 4. 5 TYPES OF TRAINING There are different types of training that can be performed about improved technology. These are: awareness training, basic user training, advanced application user training, manager and supervisor training and system management training. At whatever capacity in industry, knowledge is very important. After college people end up being either direct users of technology e. g. drafters, designers or managers and supervisors working in different areas such as mechanical engineering, electronic engineering, hydraulic and electric circuit design, NC part programming, sheet metal development, piping layout among others. To be fitted for such fields enough training needs to be done in depth and broadly with the knowledge that training is a practical exercise involving real people in the real world and not a theoretical exercise carried out with perfect students having identical and complete knowledge, experience and skills (Stark, 1988). The cheapest source of training is the one offered at educational institutions though the skill gained can range from poor to excellent. To equip the students or trainees with awareness on technology, the following can be used: Journals and magazines, Exhibitions, Conferences and seminars, Courses, Consultants, Open-learning- which allows the trainee the opportunity to learn wherever, whenever and at whatever pace. Awareness programs of seminars, literature, videos sponsored by industry associations, government departments and educational institutions. To offer effective result, coupling all these sources of awareness with practical and hands-on experience is of paramount importance. If one of the main aims of teaching is to build confidence, and confidence is acquired as a result of experience, then it follows that for any teaching process to be effective it has to be about promoting and extending opportunities to experience the subject. CHAPTER FIVE 5. 0 DESIGN ANALYSIS 5. 1 DESIGN ALTERNATIVES Alternative 1 Figure 5. 1 Alternative design 1 Figure 5. 2 Alternative design 2 5. 1. 1 Comparison of alternatives |Parameters |Alternative 1 |Alternative 2 | |1. Complexity of mechanism |simple |complex | |2. Cost at a glance |expensive |cheaper | |3. Technology of part production |involving |simple | |4. Power transmission |Adequate access |Limited means | |5. Safety |safer |Less safe | |6. Gripper mechanism | Simple and efficient |Simple and efficient | |7. Size |smaller |small | |8. Efficiency |More efficient |Less efficient | |9. Performance |excellent |good | |10. Reliability |excellent |good | From this comparison alternative 1 was chosen. Though the cost at a glance is high and technology of part production is involving and a little bit costly, it’s chosen because it is superior in the other comparison parameters. 5. 2 SPECIFICATIONS 5. 2. 1 Task Specifications 5. 2. 1. 1 Performance Specifications The designed system is to grasp a box of shape shown below, from a working table [pic] Figure 5. 3 Shape of object to be grasped Lift it up to gain a clearance from the working table surface Carry it through the required angle to some new position on another table. The load or box should then be brought to the surface of the new table after which the load is released. After release the arm moves to the initial position ready to repeat the sequence. 5. 2. 1. 2 Design Specifications Grasping of box or load is achieved through the gripper shown below. The gripper is operated by a chain and sprocket mechanism which is powered by a motor. The lifting action is achieved through a rack and pinion arrangement. The pinion is driven by a motor via a belt arrangement. Rotation is achieved through a motor driven gearbox. This motion is transmitted to the rotating member (shaft) through a flange coupling and to the entire design through a woodruff key. After rotating, reverse rotation of the motor helps give reverse rotation of the pinion. This helps lower the load to the surface of the second work table. Release of the load is through reverse in rotation of the motor driving the chain and sprocket arrangement. A reverse in the rotation of reduction gearbox helps the entire system back ti the initial position ready for the next task. 5. 2. 1. 3 Dimensional Specifications Figure 5. 4 Determination of principal dimensions Maximum height-1m Maximum reach-0. 5m Maximum lift of beam-0. 4m Maximum opening of gripper-50mm 5. 3 EXTENT OF THE ANALYSIS The more detailed parts of the analysis have been confined to the gripper mechanism. Other design features concerned with functional efficiency are examined and commented on in less detail. Comments on the belts, hollow sections, chains, and sprockets, fasteners, washers, couplings, safety actors, keys and keyways are confined to general descriptive notes. Finally an assessment is made of the whole machine in relation to functional, aesthetic and ergonomic criteria. 5. 4 GRIPPER MECHANISM ANALYSIS [pic]Figure 5. 5 Gripper mechanism 5. 4. 1 Gripping Force Consider the end section of the gripper with all forces indicated as shown below. [pic] Figure 5. 6 End section of gripper Let Mg-weight of object being picked P1 – Gripping force –acting on both sides to ensure no slip. They share the weight of the object. P1 = µN Where N- normal reaction that is perpendicular to the surface of the object  µ-coefficient of friction NB: N=P2 From balancing of forces in the y-direction 2P2 = Mg P2 = [pic]=N Since P1 =  µN Then P1 = [pic] Let the mass of the object = 10Kg. The mass of Most of the components that can be handled in the mechanical engineering workshops during laboratories range between 1Kg and 10Kg. the higher value is taken to even cater for the intermediate weights. From appendix of typical coefficient of static friction values for various material combinations: The value of coefficient of friction,  µ, will range from 0. 30-0. 60 i. e. For steel-woven asbestos. Taking the lower  µ then,  µ=0. 30 P1 = [pic] = [pic] = 14. 715N Total clamping force = P1+ P1 = 29. 3 N 5. 4. 2 Torque required to produce desired clamping force-Power screws Standard bolts with 60? threads are widely used to impart a clamping force T= W [[pic][pic] Where T= torque applied to turning screw W= load parallel to screw axis rm= mean thread radius rc= effective radius of rubbing surface against which load bears, called collar ra dius f= coefficient of friction between screw and sprocket gripper threads fc= coefficient of friction at collar ? = helix angle of thread at mean radius ?n = angle between tangent to tooth profile (on the loaded side) and a radial line, measured in plane normal to thread helix at mean radius. Illustration of edge [pic] Figure 5. 7 Power screw motions Alternatively, The average value of the tightening or clamping Torque, T can be shown to be: For, Course thread,  µ = 0. 15 T= 0. 195dw Course thread,  µ = 0. 10 T= 0. 135dw Fine thread,  µ = 0. 15 T= 0. 189dw Fine thread,  µ = 0. 10 T= 0. 130dw Diameter, d in these equations is the major or nominal diameter (illustration above) Values of coefficient of friction for the threads of translation screws have been determined by investigations and have been found to depend on the quality of materials, workmanship in cutting threads, degree of â€Å"running in† of the threads and lubrication. Published articles on experiments for screw-thread friction indicate that the following values would be a good estimate of the coefficient of friction. * Mean value of  µ = 0. 15 Range of variation  ± 33% Let the nominal diameter = 0. 5† T= 0. 195 x d x w = 0. 195x 0. 5 x29. 43 = 2. 87 Nm The screw threads are on two sides Therefore Total torque =2T = 2x 2. 87 = 5. 74 Nm *Lambert, T. H. , â€Å"Effects of Variations in the Screw –Thread Coefficient of Friction on the Clamping Force of Bolted Connections,† J. Mech. Eng. Sci. , 4, 1962, P. 401. 5. 4. 3 Power Required Let the gripper grip the object in 2seconds Let the smallest component it can hold be 50mm Therefore from the plan view of the gripper above (fig. ) the distance, s it is supposed to cover to clamp the load is: s= [pic] =75mm Since the power screw is double-threaded. Linear speed, ? = [pic] = [pic] = [pic] = 0. 0375 m/s Let the pinion diameter = 20mm Then from, ? =? r ? = [pic] =3. 75 rads/sec Since both sides move. Number of revolutions ?= [pic] [pic] = [pic] =35. 81 r. p. m Power, P P= T ? = 5. 74 x35. 81 = 205. 5W 5. 4. 4 Pins Two pins are used in the knuckle joint connecting the bars of the gripper that is in tension. 5. 5 HOLLOW SECTIONS Hollow sections are used in this design. These sections are more recent than channels, tees and angles. The chief advantage of the hollow form lies in the combination of rigidity, strength and lightness resulting from the metal being distributed around rather than on the axes of the section. Hollow circular sections give great torsional rigidity because of the relatively high polar second moment of area, and equal resistance to bending in all planes because of the symmetry of the cross-section. Another advantage of the hollow section is the smaller external surface area requiring painting (about 30-40% less than an equivalent rolled steel solid section. and hence the lower maintenance costs involved. Also, the convex surface of a tube does not provide recesses in which moisture can be retained, so reducing the possibility of corrosion on the outside. The joining of hollow structural members too, is easy through welding (metal arc welding) 5. 6 BELT A V-belt was chosen for this design because of these advantages: Compactnes s of design-the center distance in this particular design is small. Smoothness which is possible because the V-belt is endless. Bearing life-because of lower belt tensions, lower bearing loads are possible. Also, since this type of belt readily absorbs shock, bearing life is lengthened. Dependability- Maintenance- except for occasional tightening of the drive(required to correct stretching and creeping), little maintenance is required. 5. 6. 1 Dimensions of belt cross sections The V-belt must fit the pulley so that it does not make contact with the bottom of the groove. This arrangement avoids any radially outward reaction from the groove bottom, and eliminates the possible formation of a cushion of air being entrained at high belt speeds, either of which would tend to force the belt away from the groove sides and so slip. Belt dimensions corresponding to their cross section symbols are given in appendix II 5. 7 FASTENERS Fasteners are devices that permit one machine part to be joined to the second part. Hence, fasteners are involved in almost all designs; this design being no exception. The acceptability of any product depends not only on the selected components but also on the means by which they are fastened together. The principal purposes of fasteners are to provide the following design features: ? Disassembly for inspection and repair ? Modular design where a product consists of a number of sub-assemblies. There are three main classifications of fasteners: Removable- this type permits the pars to be readily disconnected without damaging the fastener. An example is the ordinary nut and bolt fastener. Semi-permanent- for this type the parts can be disconnected but some damage usually occur to the fastener. One such example is a cotter pin. Permanent- this type is used when it is intended that the parts will never be disassembled for example rivets. The following factors were taken into consideration in the selection of fasteners for this application: i. Primary function of fastener ii. Appearance iii. A large number of small-size fasteners versus a small number of large-size fasteners ( an example is bolts) iv. Operating conditions such as vibration loads and temperature v. Frequency of disassembly vi. Adjustability in the location of parts vii. Types of materials to be joined viii. Consequences of failure or loosening of the fastener. 5. 8 WASHERS Washers are frequently used with bolted fasteners. The most common type is the plain washer. Such a washer increases the bearing area under the nut or head of a bolt. Hence, plain washers are used to protect mating surfaces of bolted parts. They are especially needed when the parts are made of soft metals that can be easily damaged by a turning nut or bolt head during tightening. Lock washers are used to keep bolted fasteners from loosening. One type provides a spring force that helps maintain the desired bolt tension. In another type the lock washer has protruding teeth that dig into the fastener and mating parts and prevents loosening. Sometimes it is absolutely necessary that a bolted fastener not come loose even as a result of vibration. In such cases, a positive type lock washer is used. This type of washer contains a tab that is bent up against the flat portion of the nut or bolt head. The tab prevents rotational motion of the nut or bolt head. 5. 9 COUPLINGS Coupling refers to a device used to join two shafts. Shaft couplings are also required to couple machines manufactured separately e. g. electric motors with pumps. 5. 9. 1 Flange coupling This is the one that has been used in this design. This is a rigid type of coupling used for connecting shafts; 18-200mm diameter. Two flanges are used to join coaxial shafts; two cast iron flanges keyed to the ends of shafts, fastened together by means of a number of tight fitting bolts. Advantages Simple in design Cheap Dependable Require less maintenance Can transmit high torques The torque is transmitted by frictional forces acting between the faces of the coupling halves or it is transmitted by the connection bolts which are subjected to shear. The bolts work in shear only when they are precisely fitted without any clearance in the mounting holes. Disadvantages Unsuitable for absorbing shock loads No flexibility- incapable of equalizing effects of misalignment Difficult to loosen hence, wheels, pulleys and other mounted parts have to be in two parts. 5. 9. 2 Derivation of flange coupling formula First, it is assumed that none of the torque is transmitted as a result of friction between the interface of two flanges. This assumption is conservative because the clamping force of the bolts is quite large . However, frictional forces are unpredictable especially if the bolts undergo relaxation. We are therefore assuming that all the torque is transmitted through the bolts. For equilibrium, the summation of each bolt shear force multiplied by its moment arm to the centre of rotation equals to the torque, T. The torque is given by: T =Fb xZx [pic] =Ab x ? x Z x [pic] Where Fb –circumferential force on each bolt Z- Number of bolts K- Bolt circle diameter Ab –x-sectional area of each bolt The equation assumes that the load is equally shared by each bolt. That is each bolt must fit tightly in each hole without any radial clearance. The shear stress ? is taken to be 0. 25 the yield strength of the bolt material For calculation purposes, an Impact Factor is taken into account. This is given by: Tmax= C x Tnom Where Tmax -maximum torque Tnom -nominal torque C- Impact Factor 5. 10 SAFETY FACTORS Allowable stress This is the safe limiting stress, which is predetermined by taking cognizance of the operating conditions of the designed part. This strength criterion is also sometimes called working stress or permissible stress. Normally, to safeguard against permanent set or plastic deformation, the allowable stress is kept well within the elastic limit or yield point The following are relations for the static working conditions: Ductile material Allowable stress = [pic] Brittle material Allowable stress = [pic] Where F-factor of safety scf- stress concentration factor The factor of safety is a design criterion. The selection is at the discretion of the designer based on experience, authorities, and level of knowledge. The safety factor is very important as it is used to account for the unknown aspects and the various uncertainties. In this design a factor of safety of 1. 25 has been taken. 5. 11 KEYS AND KEY-WAYS A key is a rigid connector between a shaft and the hub of another component such as a pulley. A key helps prevent relative rotation between the parts. If a key is to be used a key seat must be provided in the shaft and a keyway in the hub of the other part. A key seat weakens the shaft and this forces a reduction in the design stress. 5. 11. 1Wood ruff key This is a spherical type of sunk key. It is semi circular in shape and is cut from a round bar or disk. The key seat in the shaft is also semi-circular in shape in which the key fits. The top of the key fits into a plain rectangular keyway in the hub and the key seat is equal to the thickness of the key. The key way is just half key seat. The key can be easily adjusted in the recess. It is largely used on machine tools and automobile work. It accommodates itself to any taper in the hub of the mating surface. It is used on tapering shaft ends. Figure 5. 8 Woodruff key CHAPTER SIX 6. 0COMPONENT PRODUCTION 6. 1 PARAMETERS FOR OPTIMUM PRODUCTION Optimum production is associated to the following parameters; 6. 1. 1 Product Analysis The elements of product analysis that should be taken into account are: i. Nature, kind and properties of raw materials i. Quality specifications and tolerances iii. Quantity to produce 6. 1. 2 Operation Analysis On the basis of tentative ideas of product analysis operation analysis is done. For operation analysis it is necessary to decide: i. what operation should be done ii. sequence to follow so that the desired product could be made economically 6. 1. 3 Machine Analysis It is necessary to know which machine should be used for a particular operation so that economy of production is maintained 6. 1. 4 Operator Analysis On the basis of the tentative ideas of machine analysis, operator analysis is done. For handling different machines different type of operator is needed. This may be skilled, semi-skilled or unskilled. 6. 2 RESOURCE REQUIREMENT The following resources are needed for the production exercise: 6. 2. 1 Capital Resources The available capital resources include machinery and manufacturing equipment in the mechanical engineering department workshops. These include: lathe machines, drilling machine, milling machine 6. 2. 2 Tooling Resources The available tooling resources are the consumables like the cutting tools which include; drills, lathe tools, milling cutters and the specific jigs and fixtures for machining and/or welding. 6. 2. 3 Material Resources The materials required in the manufacture include: Raw materials like metal bars and metal sheets Standardized finished components such as nuts and bolts, washers, bushes, bearings Subassemblies like the electric motors 6. 2. 4 Human Resources The technicians in the mechanical and production workshops are to be involved directly or ind