Designation:D1478−11StandardTestMethodforLow-TemperatureTorqueofBallBearingGrease1ThisstandardisissuedunderthefixeddesignationD1478;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thistestmethodcoversthedeterminationoftheextenttowhichagreaseretardstherotationofaslow-speedballbearingbymeasuringstartingandrunningtorquesatlowtemperatures(below−20°C(0°F)).1.1.1Torquemeasurementsarelimitedbythecapacityofthetorque-measuringequipment.NOTE1—Wheninitiallydeveloped,theoriginaldynamometerscalelimitedthetorquecapacitytoapproximately30000g·cm;theoriginaldynamometerscaleisobsolete,however.Thesuggestedreplacementscalehasnotbeenevaluated;itcouldextendthelimittoapproximately75000g·cm.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.Theexceptionistorquevaluesthataregivenincgs-metricunits,whichareuniversallyusedingreasespecifica-tions.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardandwarningstatements,see6.1.1,7.2,7.4,8.7,and8.11.2.ReferencedDocuments2.1ASTMStandards:2D4693TestMethodforLow-TemperatureTorqueofGrease-LubricatedWheelBearings2.2ANSI/AFBMAStandard:Standard20-1987RadialBearingsofBall,Cylindrical,Roller,andSpherical-RollerType—MetricDesigns(AF-BMACode20BCO2JO)32.3ASTMAdjuncts:Standardballbearings(setof5ballbearings)43.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1low-temperaturetorque,n—thetorqueing·cmre-quiredtorestraintheouterringofaNo.6204sizeopenballbearinglubricatedwiththetestgreasewhiletheinnerringisr...
