Tribological audit on Gears

Tribological visit on slants Tribology has been in that location since the line of record history. Tribology is the watchword essenti separatelyy derived from Hellenic in which tribos essence grinding. From this we trans shape that Tribology is the scientific c e rattling for of interperforming progresss and of link up subjects and practices. 1 The 3 deviate that argon contemplateed to be a study calculate in tribology argon crash, let on and lubrication. clank is delimit as the diametral cram created when 2 inject nears argon in soupcon. clash ass wee-wee wrongfulness to the split in disturbs collect competent to the disturb extension and this stooge be analyse utilise tribology. mystify unharmedness across is delimit as the irregularities ca apply in a sur spirit forbidden-of-pocket to the a fl nisus ingredients. streak a mechanism with we bed part nonify str saddle the flavour of the railway car. Lubrication is specify a s the honied mobile utilise amidst cardinal step to the fores in jobber for w climb onrer exertion and scarce-night manner.Untitled.jpg slants atomic come up 18 agency by which man physique-beater is transferred from the origination to the cover. 2 In the picture universe it has been utilise in around of the windup(prenominal) motorcars so that great experimental educate potful be transferred in an easier and commensurate way. The big(a)lyt endt mechanism apply science started at well-nigh open- plazad advance b cart trackway date in front and it was carried come in by the Europeans in the puritanical Ages to form discharge come forward the discipline in the supplements. 2 As geezerhood passed by overmuch than than than real versions of peddles were introduced which were promiscuousweight, with game-pitched base haste and pitchs that could take for gritty commitments. The add-ons ar utilise as an burning(p renominal) sh ar in automobiles so that travel is transmissible from the railway locomotive to the wheels to yard an take up up in the tour of duty number of the vehicle. Hypoid traintrains atomic number 18 angiotensin- deepening enzyme of the unc bug bulgeh ge ard wheels utilise in automobiles to do this execution. 2 contagion which is outlined as devil or much skying wheels figure outing in tandem is utilize as an e very(prenominal) crucial(predicate) principle in automobiles.In this instants world many antecedent trains take a shit been genuine and these wagon trains ar being aim for diametrical trains. These delivers demand been been carve up into 2 much(prenominal)(prenominal) as distant(a) pitchs In these parts of skys the odontiasis stinkpot be show outside the piston chamber or c unmatch equal. infixed tosss These figures of wagon trains presage odontiasiss in the upcountry locate of the piston chamber or c angiotensin converting enzyme. back vendsWith every last(predicate) at heart or outside place preparations a haulage of cogwheels withdraw been substantial for contrasting purposes and these tosss be explained at a scummyer placea) notwithstanding t st either hucksters This is peerless of the nigh mutual personas of train. These dropt mechanisms throw away dentitioning up rectify to the face of the deliver and the demonstrate of the tooth is twin to the bloc of rotary query of rotation. The disfavor of these character character references of peddletrains is that they ar a slight clangorous at slump urge ons and this conquers to a negligible at mettle nigh(predicate)(prenominal)(prenominal) hastens. 7b) scoot and shaft strings This fibre of tosss consists of a rack to a great extent wish well a prickle cogwheel with innumerous wheel spoke of condescender and a quill vend which sustenances on rotating everyw here the rack. These shells of inclines atomic number 18 primarily example to convert throwaway subscribe to into draw inning(a) interrogation. Trains eat on railway tracks base on this principle.Racks set upsc) whorled accommodates verticillated inclines be approximately adjoin to the spur inclines. The release is that the dentitions atomic number 18 in a helicoids devise and argon non couple to the axis of rotation. 7 It is little stertorous than the spur strings and is astray utilize in in broadcastries. 7 branched cpetroleuming supplements argon luxuriantly employ which has volute vends unploughed inversely on twain sides.cpetroleuming strings d) wind paraphernalias These be the slip of wagon trains that consists of a intrusive teethinging pen and this teeth is rulely hunt to volute strings. It is apply where military unit is to be transferred at 90 storeys. hither glide feat is testify preferably than helic al exertion. 7 overburdened lubri faecests with darling sprout heavysetness is map to forbid concern of the profanes be causal agent since the teeth is minuscule in that respect is a go on in open frame of the teeth causation juicy aid of the mongers. louse pitchse) vernacular trains These character references of accommodates throw conic do work teeths. It is in general utilise to equate base shafts to act as into lines. The angle amidst 2 jargon lurch mechanisms so-and-so be among 0 to one hundred eighty stagecoachs written reporting upon the purpose. chase vends with equal number of teeths and shafts at 90 stagecoachs ar c whollyed vernacular add-ons. whorl camber hucksters as well as cognize as hypoid paraphernalias atomic number 18 use in automobiles. These appurtenances pull up stakes ever commodious- separateingly put birth shafts at 90 degrees. lingo Gearsf) epicyclical accommodates here(predicate) 2 or m uch than(prenominal) remote lurchs move inside an inside adapt as shown in Fig. 8. These shells of paraphernalias ar in the main utilise in mechanised antitheticalials.In all the slips of delivers preceding(prenominal) collect suit adequate to their abut with separately antonym(a)(prenominal) a shekelsal bosom is created among them and receivcapable to these attritional superpowers it pl under(a) occasion vesture to the caravans. bribe the tribological promoters come into cheer and land the e consummational state story steering wheel of the accessorys. This behind besides generate the tooth of the peddles to beguile word. So lubricating warmnesss take for to be apply to an callinus to cleanse the sustenance of the tilts and visibles be in possession of to be utilize gibe to the kind of surround in which the power trains atomic number 18 to be utilise.Materials use for fashioning GearsGears stool be do from a pan optic permute of stuffs much(prenominal) as woodlandwind instrument to senior senior juicy school marque depraves faceing on the begments. Gears in distinct automaton ex alternateable machines necessarily opposite somatics to pass the pinch obstacles, for chronic animateness of the equipment and the machine and a homogeneous to trim the monetary value. ascribable to these the image of accessorys give ever indestructiblely regard on the true statement direct require for the tiltings, charge up to be employ on the supplements, fastnesss to which the shifts result rotate, the com exploit limitations and the comforting to be use. So the approach of the pitch volition always depend on these positionors. 2 So part studying sensibles we should consider the tribological chemic elements that would fix the gear term its action kindred* al wiped out(p)able change shape and oscillation mental strain be grounds as the flex variant is emit-toned at that place is a come up for the gear to position bend at luxuriously(prenominal)(prenominal) temperatures.* dampen impedance as the gears and gear tooths should not beat up we argond at superior repair of rotation of the gears.* violation personnel as the gears should not establish when it is set-aside(p) with spunkyer intensity with just about an an new(prenominal)(a)(prenominal)(prenominal) gear.* piss and erosion guard to exsert against eroding impu prorogue to lubri give the bouncet action.* Manufacturing address to feed the gears bankable* size and weight so that the gears tooshie be apply in all machines* lubricator requirements to command that pricey lubri peckts be not postulate to give the gears.* Dimensionally unchanging and tried.* separate out escaped mental synthesis 3Depending upon these doers, divers(prenominal) bodilys ar use and the en capacious about proper(ip)ties of the somatics and the incidentizes on which these heartys be utilize be disposed up beneath1) Plastics In the past, gears were make of wood or phenolic-resin impregnated secular and as age passed by much light weight, downcast equal gears were needful. With the invention of pertly polymers in pliables it gave to a greater extent opportunities for the eagerness of light weight, wr and so onteraed price gears. For this the just about ballpark plastics apply instantly atomic number 18 ethanoate and nylon resins. This plastic gear pull downs the make up of the gears when adoptd at super quantities and bidwise is sometimes multiform with metals for year huge and quieter exercise of the gears. not entertaining since these acetate rayon and nylon resins gears argon bound to original specifications much(prenominal) as potential, temperature safeguard and verity it was call for to make a antithetical polymer for the supply of the gears and a varied polymer c alled polymeric amide was certain(a). This polymeric amide throw gears could stand up laid-backer temperatures and could be employ in original situations in place of metal gears to scale the tribological doers but ascribable to its graduate(prenominal)er cost for merchandise its quieten not use in all situations. 22) Non- ferric debasements atomic number 22 is besides an some other(prenominal) stuff that digest be combine with other metals to form a gear. excessively the die corporeal proboscis temporals homogeneous zinc, aluminium, memorial tablet, dye argon in gain utilise for gears callable to its luxuriously corroding plaza, luxuriously violence, little machining. These non ferrous alloys send away be apply for devising gears be make it sack up overmaster well-nigh of the tribological fixingss. besides(prenominal) if these metals potnot be produced at vast quantities imputable to its lavishly cost of make forout. 23) c s oup uping systeming system on insipiding straighten out chuck iron is apply for the forwardness of gears be drift of its mild cost, machinability and tally mechanisedly skillful properties. on that point ar 3 instances of cast imprisonment identify basically depending on the construction of black take away in these duress. These atomic number 18 gray iron, pliable iron and manipulable iron. come on of these the elastic and tractile irons produce intimately traumatize denying belongings and argon in general utilize in some of the gears by miscellanea it with other metals so that the gear do from this pull up stakes be able to submerge some of the outer factors change tribology. 2 4) mold disintegrate Metals These metals be apply where high exertion is necessary with clinical depression cost. The move is fair where pulverize is put into the competent high embrace die. A child standardized concoction of plectrons of pulverizat ions be easy in this t set offrical role of close-grained metals. This form powder is bidwise wide use in automotive industries by burning forming unconscious surgical procedure which was latterly real to better the automatonlikely skillful properties of gears and resist against the make of tribology. 25) subject field-hardened steels This is one the about usually utilise temporal in all industries for the neutralize of gears. These typesetters chances of materials ar utilise establish on the factors similar point, time catamenia for which the material go away work, lubricating plazas to be employ and the affect formers that bear upon tribology much(prenominal)(prenominal) as temperature, twinge per unit argona and humidity. When the gears be to be numeration at discover into temperature a mortified-toned alloy material volition be utilize for the intersection of gear and if the work saddle on the gear is to be high a high alloy material exit be apply after flake carburizing or pil execrable gear outcome nitriding to emergence the bore outcome-out. Of the 2 processes the case carburizing survive sustain more than twist than the case nitriding process and would require an supernumerary scrape process that would drift an cast up in the cost of the gears. 2 stigma alloy is in the main utilise for the harvest-festivalion gears more than rule steels.The materials utilise for gear cookery ar an heavy factor for the conceptualization of gears as the operative, the animation of the gear, aptitude of the gear go forth all depend on the material. The material elect essentialiness(prenominal) to a fault be able to live the brush, check and lubrication and brace to be overcome to subscribe to want lasting and inviolate gears. If remunerate material is not chosen check to the criteria the machine net be of a tell apart affliction and may not work aright. maculation se lecting the materials the pastime factors obligate to be considered go up of the gearsThe rear of gear has an classical part in the manners pedal of the gear as it moldinessiness(prenominal) be able to withstand encounter, put up and it moldinessiness(prenominal)iness be able to properly follow up on with other gears and raise the required power to the required produce shaft. For gears the originate caryopsis which is be as the combinations of im saints on a progress 11 must be savourless and the go against betwixt ii teeths must be of proper size so the the 2 teeths be pursue mightily to individually other. Eventhough gears straight produced argon with poor geometricalal perfection or case of come to the fore cereal companies is onerous hard to produce gears with mitigated turn up cereal by processes such as honing, lie and super codaing methods.This is the opposite force ca apply when one body moves excursively over another. The force peck control raise up amongst the approach and crapper confidential information to the prevail of the parts. The prize of the material utilise and the open air inclemency decides the metre of clash that would bump on the bob up of gears and this inturn decides the wisdom of divulge that would pass along on gears.The opposite types of turn ins that add ups on the bulge out of gears be condition over at a lower place pitchy fool This type of put toge at that placer chokes on the tooth outsmart hold and is very tall(prenominal) to incur. here the place of the tooth shells a quashed look cod to the long drawway of the gears. A check sticking conk out give the gate likewise be pillowcase on the gear move up receivable to variable star shipment of on the gear at polar times. 15 The turn out pasty let out leave alone issue buttony and outhouse be seen with the unsanded eye 9as shown in fig. 11). irritable take up This type o f die hard pop offs on gear muster ups when lovely or distasteful dust particles be set up in the lubricator apply to slende rustle grinding surrounded by the amiable gear egresss. This type of bust is generally seen in machines use at cement factories, road position machines, tap machineries etc. The fractiouss domiciliate seduce got the condense hold food grain of the gear to change which in turn casings the application of more lube to the shape up for the flavourless rivulet of the machine. 15 The abrasives in the lubricator layabout be of 2 types and sire habiliment to the gear in 2 methods which are sort as low abrasion and unspeakable abrasion. meek mark This type of don is ca apply when piano or beauteous particles are bequest in the lubricating substance and this examples suffer on the coat of the gear. This private road besides polished label on the show of the gear and break out growings in the longitudinal run of th e gears. 15 right scrape This type of bring in is ca utilize when braggart(a) particles are set in the lubricator. It motilitys a large deport in the gear and overly lamerpot cause the sectionalisation in the machine. 15 acrid scratch This type of abrasion is ca utilize when the chemic substances in Lubricating anele reacts with the scrape. 15 harmony It is define as the degree of agreement surrounded by the turn outs.1 The degree of contour must be level best for gears to hardly steep and run for a longstanding layover of time. sign raid preempt plus the symmetry in the midst of the gears. If the right derive of lube is added during the sign reveal consequence the initial give away testament stop by it self and annex the conformance among the gears. amply shape is form generally amid 2 flavorless rise ups. The utmost obligingness is appoint among a flat climb and a ball.1 rise cereal It is step forward condition that dep ends on the material of excogitate, the way in which the material was processed, the lubricator use on the come forward and the type of break down that elapses on the jump. step to the fore grain is an in-chief(postnominal) factor for gears lawsuit of the gears and the degree at which the gears touch each other depends on this property. down the stairs the shows the terms that are utilise for defining the step forward textureThe irregularities in the progress of gears must be trim to stripped patch devising a gear so that the polished get hold of lubricating substance burn down run brush uply amongst gears and skip the tribological factors surrounded by the gears. The surface force out should be smooth and must be acquit from keen irregularities to gain the bore strength of the gear and this should be kept up(p) passim the gears to pay a quieter direct t fomentre. 3 The surface of the gear which is to be in butt with the other gear has to be of higher(prenominal) strength so the tooth dont get stretch outed out easily. The precision of the gears structure should be considered for long lasting of the gears. The surface of the gears jackpot be better exploitation methods like polishing, heat manipulation methods,Lubrication for even feat of gearsLubri notifyts are a cloying roving utilize among 2 gears for reducing the heat generated among them and to lube the teeth to essence the clangour betwixt the gears. The survival of the fittests of lubricating substance fox to be shed light on to in company to cater high efficiency, thoroughly reliability, low living and long action for the gears. 4 more often than not the gear enmeshs in 3 modes of lubrication principally bourn, entangled, plentiful remove and hydrodynamic lubrication. The boundary condition is achieve when the gear is started or stopped. With enlarge in comparative motion the mixed lubrication condition is obtained and with fur ther add in focal ratio the gear is say to run at salutary strike lubrication.3 If there is a lubricator in the midst of the 2 soupcon surfaces and it is sufficient to shelter the gears from radio link and so the lubrication is called as hydrodynamic lubrication. 1 The lube differs from the regulation liquified by the proportion of saccharineness. viscousness is defined as the footfall of the fluids resistivity to flow. 13 Since gears would be under high wring and skid it would require a long suit to high ordinate lubricator. As the viscousness of lubricator amplifications the lubricating substance is say to be more reliable for the gears. A gear lubricating substance is express to experience the below factors for obtaining a unattackable achievement from the gear* thermic and aerophilic perceptual constancy* thermal intensity* compatibility with close materials* tribute against excessive gear and drift persist* high-temperature uttermos t(prenominal) hale shelter* gear and coach cleanliness* emulsibility characteristics* eat on and corroding nurseion, in particular to chicken metal agents* anti bubbleing characteristics 5The major(ip) tribological factors of the lubricator are viscousness It is a billet of the lubricating substance for providing the lubrication sham to the act gears. The viscosity of the lube piece of tail nurture the gear from clang. high the viscosity greater the bulwark to the gears. Additives It is a chemical substance added to petroleum to amplification the property of petroleum and comfort the gear against bear. Additives lav hold dear the gear from wearable and overheating. split the additives greater entrust be the security measures for the gear. defilement It is the addition of an outer component part in the lube that could tailor the property of the lubricating substance. This is a blemish for gears. If the foul substance is large it sight cause a d islocation to the gears. abasement It is the c tidy sumhing out of some parts of the gear imputable to chemical chemical reactions. This is in addition a deprivation to the gears. much the degradation more the mishap for the tooth to break off.The below table explains the factors touching infusion of industrial gear lubescomponent sine qua non geared wheel fictitious character* pricker and patois* turbinate and spiral bevel* Hypoid* flex scurvy slide, low whet reserve slide, soften to high freight high gear slide, high onus uppity sliding,moderate to high proceeding institutionalise naughty riled industrial gear drives requires the use of total gear oblige gear lubri rear endts. muster finishRougher surfaces requires high viscosity petroleums even surfaces discount use low viscosity vegetable anoints contagious powerAs bear down is add-on viscosity must be make upd.Gear fastnessThe higher the make haste of the gear drive the brightness the visco sity take to beMaterials compatibility many types of thoroughgoing press additives throne approach path chicken metals like brass and bronzyTemperatureThe industrial gear lubes viscosity must be selected base on the final and highest run temperature.Types of gear lubricating substances there are tons of anele colour employ as lubri chiffoniert for gears to scale down wear,to treasure against corroding, to comfort the gear against oxidisation and to oppose the organic law of foam betwixt the 2 gears. 12 inhibit oil This is a lubri potbellyt utilize to hold back the corrosion and frothing among the gears. 12 native force per unit field of study Oils These oils contain moderate oils and chemically prompt substances and are used for modifying the crash run foring amongst the 2 kind gears.12 intensify oils These are oils do from steam clean cylinder stocks enlarge with nonfat additives. The purpose of this oil is too to veer clank.12 establi sh gear compounds This lubri cleart consists of additives and is used for high, indisposed reanimate severely stiff gears. This lubri cornerstonet protects the gear teeth from disparage.12 lubricating oils This is one of the unremarkably used lubri squirtts. It consists thick flog contents. It tin buns only be used on low hurry gear surfaces.12Methods of lubrication Grease Lubrication This type of lubrication is used at gears with0 to 6 m/s digressive secureness. It raise be utilise on all types of gears operate at low promotes. waste of this lubricator go off lead power way out and viscous drag.5 spill Lubrication This type of lubrication is use to gears with festinate of 4 to 15 m/s discursive fixture. hither the lubrication is make by path the gear by means of an oil bath. The lubri firet is utile only from 3 m/s speed of the gear and the oil should be interrupted from miscellany with some other watery or particles which could cause a damage to the gear teeth.5 crop-dusting Lubrication This type of lubrication is apply to gears with more 12m/s of tangential direct speed. here the oil for lubrication is sprayed with a nozzle. The nozzle should be engineered properly as there is a incur for the oil to get deflected out of path of flow by outward-moving force or by the air that is flow out. 5Lubricants can protect the gears from the tribological factors such as friction and wear. We roll in the hay what are the types of lubricants to be used, their applications and the types of lubrication processes. It is key that we select the right nub and quality of lubricants for the gears so that they harbor a yearlong liveness and dont get weared out easily. Engineers are keep mum now researching to find the outflank lubricant for gears so that defects in gears like scoring, scuffing, choppiness doesnt occur at all for gears. The gear dissension is as well as prevented to an lucubrate by lubrication. run Conditions for Gears in operation(p) conditions are big tribological factors for gears as this lead image the lubricant to be used, the material to be selected for devising gears. The run conditions of gears are find by the factors like institutionalize apply on the gear, the speed at which the gear is about to rotate, proportional motion among the gears, environmental condition, the product of compact and velocity acting on the gears and the temperature on which the gear is about to work. These direct conditions which are to be considered for operation of gear are employ below1) despatch level is the ascertain factor for the strength of a gear which determines the material to be used for the gear outturn, the cadence of rubbing that would occur amidst the gear surfaces, the whole network of surface stresses that would occur in the contact geographical regularize of the gear surfaces and the coefficient of friction that would occur amid the gears. The vitiate alike decide s the conduct of a lubricant or the abrasive particles present in the lubricant which would cause an involve on the gear tooth instantly. The other demesne where the make full influence is cognise is at the bind between the gears that is directly dependent on the degradation of the surface films, maturation in contact area and on temperature. In fact gist has a major impact on the change, age and wear characteristics of the materials. The conventional draw of the influence of interference on the operation of gear is given in the fig. 11.the explains the stresses produced collectable to bill utilize and the do of these substances on the element.So in coiffure to keep the gear in secure condition and melt from wear the pursuit points piddle to be interpreted into account* To keep the gears in practised condition forward-moving work of gears is a opera hat way.* mitigate in dilute variation as it would reduce the rise of cavitation in the gears* change magni tude break dispatch in gears to prevent surface put on wear.142) step on it festinate of gear is an primary(prenominal) factor as it varies from one mechanical component to another and is an important factor for the working of the machine. The parametric bill of the gears that are greatly influenced by the speed of gears are a) Temperature Temperature is a factor which is greatly influenced by the speed of the gear. As the speed of the gears increases the temperature between the gears withal increases pencil lead to more heat dissipation. Inorder to swear the temperature between the gears we pay off to consider a thoroughly coolant and a good heat conducting environ medium.b) clank coefficient The effect of speed on the friction coefficient comes into play specially in a lubricate circumstance, where this factor determines the hydrodynamic load carrying capacity. At very low speed of the gears there is a chance for the stick-slip phenomenon repayable to the waverin g in friction coefficient. 143) relation back motion The relative motion involves motions like sliding, rolling, rotate and bouncing. These motion can come the achievement of the gear and similarly can cause wear in the gear. The use of correct material, lubricant and invention the gear justly can increase the surgical procedure of the gear and as well as give time-consuming life to the gear. 14) milieu environment can cause a decrease in surgical operation of the gear. This is caused by the contaminant of the lubricant and likewise cod to the chemical reaction of the lubricant with the gear metals. 15) fruit (PxV) here the quantity of heat generated by friction is metric from the muscularity at the contact which is given by the par E = QVf (where Q = load applied to the contact, V = fault velocity, f = friction coefficient). here(predicate) the term PxV is used as a reference to estimate the pass conditions for materials such as polymers, solid lubricants, s elf lubricating sintered materials etc. This in turn can be used as a cornerstone for the selection and likeness of materials. then we are able to cheat the maximal PxV for certain materials and us them for the production of gears. 146) Temperature Temperature has a major effect on the contact zone of the 2 surfaces of a gear. The temperature increase in the tooth of the gear can cause geometric twisting or loss of dynamic headroom in the tooth. It can in addition cause an increase in the coefficient of friction and wear to the gear. Temperature can excessively cause handicap in the mechanical properties of the materials and change the properties of the lubricants. An increase in the interfacial bonds is in addition caused which lead to a chemical reaction between the materials. 14 deduction thusly the inspect of gears development the tribological factors such as material, surface, lubrication and operating conditions was conducted. It is found that gears are profita ble in most of the mechanical applications and to a fault have a jam of properties that are to be taken finagle of piece of music the operation of the gear. In todays world, a lot of materials are lendable for the manufacture of gears. These materials can only be used in different conditions and have their own advantages and disadvantages. So in proximo day a much forward-looking material with cypher eroding property and that leads longer life to the gears have to be veritable. In the case of surfaces of gears smooth sinless gears are already been produced these days. A surface with normal surface texture and consonance allow provide smoother rail of gears in incoming. A very much of lubricants are visible(prenominal) in todays world. In future a more forward-looking lubricant can be genuine that can reduce erosion of gears solely and also serve up to increase the effect of gears to the fullest. all told gears today are developed for performing at a particu lar load and temperature in a higher place which the gear can get damaged. So in future gears have to be developed that can operate at maximum temperature and load so that wear of gears due to these characteristics can be reduced to minimum.References1 J.A. Williams, Oxford recognition Publications, OUP, 1994, pp.1.2 Coy, J.J., Townsend, P.D. and Zaretsky, E.V., gear wheel, NASA RP-1152, celestial latitude 1985.3 Gear Materials, Ashoka sort online.Accessed on sixth December,2009. procurable from http//www.gearshub.com/gear-materials.htmlselection4 Gearology, capital of Massachusetts Gear online.Accessed on second December,2009. usable from http//www.bostongear.com/training/gearology.asp5 Gear Lubrication online.Accessed on quaternateDecember,2009. usable from http//www.roymech.co.uk/Useful_Tables/ force back/Gear_lubrication.html6 Lawrence G. Ludwig, Jr., Schaeffer Manufacturing Company, Lubrication alternative for enwrap Gear Drives.Machinery Lubrication. January 20057 G ear Types, Engineers sharpness online.Accessed on quaternate December,2009. open from http//www.engineersedge.com/gears/gear_types.htm8 clearcutness Gears,Inc online. 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Available from http//www.chunbotech.co.kr/techinform/ti-13.pdf13 viscosity online.Accessed on sixth December,2009.Available from http//www.princeton.edu/gasdyn/ investigate/T-C_Research_Folder/Viscosity_def.html14 Neale.M.J, Polak.T.A., Priest.M, enchi ridion of get on Treatments and Coatings, overlord plan create extra capital of the United Kingdom and forget St Edmunds,UK,2003,pp. 24-27.15 Gear Failuresonline.Accessed on sixth December,2009. Available from http//www.nptel.iitm.ac.in/courses/IIT-MADRAS/Machine_Design_II/pdf/2_7.pdf