Designation:D5183−05(Reapproved2011)StandardTestMethodforDeterminationoftheCoefficientofFrictionofLubricantsUsingtheFour-BallWearTestMachine1ThisstandardisissuedunderthefixeddesignationD5183;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethodcoversaprocedurefordeterminingthecoefficientoffrictionbymeansoftheFour-BallWearTestMachine.21.2ThevaluesstatedineitherSIunitsorintheformercm-kgfmetricunitsaretoberegardedseparatelyasthestandard.Withinthetextthecm-kgfunitsareshowninparentheses.Thevaluesstatedineachsystemarenotexactequivalents,thereforeeachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemscanresultinnonconformancetospecification.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Specificwarningstatementsaregivenin7.3–7.6.2.ReferencedDocuments2.1ASTMStandards:3D4172TestMethodforWearPreventiveCharacteristicsofLubricatingFluid(Four-BallMethod)2.2ANSIStandard:4B3.12SpecificationforMetalBalls3.Terminology3.1Definitions:3.1.1coeffıcientoffriction,(µ)—theratioofthetangentialforcethatisneededtostartortomaintainuniformrelativemotionbetweentwocontactingsurfacestotheperpendicularforceholdingthemincontact.4.SummaryofTestMethod4.1Three12.7mm(0.5in.)diametersteelballsareclampedtogetherandcoveredwith10mLofthewear-inlubricant.Afourth12.7mmdiameterball,referredtoasthe“topball”ispressedwithaforceof392N(40kgf)intothecavityformedbythethreeclampedballsforthree-pointcontact.Thetem-peratureofthewear-inlubricantisregulatedat75°C(167°F),andthen,thetopballisrotatedat600rpmfor60min.4.2Fluidisdiscardedandballscleaned.Thewearscardiameteroneachoft...
