ASTM_D_3336_-_20b.pdf

Designation:D333620bStandard Test Method forLife of Lubricating Greases in Ball Bearings at ElevatedTemperatures1This standard is issued under the fixed designation D3336;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method covers the evaluation of the perfor-mance of lubricating greases in ball bearings operating underlight loads at high speeds and elevated temperatures.1.2 The values stated in SI units are to be regarded asstandard.1.2.1 ExceptionThe values given in parentheses are math-ematical conversions to inch-pound units that are provided forinformation only and are not considered standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific warning statements,see 8.1.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A600 Specification for Tool Steel High Speed2.2 ABMA Standard:3Standard 4,Tolerance Definitions and Gaging Practices forBall and Roller Bearings3.Summary of Test Method3.1 A grease lubricated SAE No.204 size ball bearing isrotated at 10 000 r/min under light load at a specified elevatedtemperature.Tests are continued until failure or completion ofa specified number of hours of running time.4.Significance and Use4.1 This test method can be used to evaluate the ability ofgrease to provide adequate lubrication for extended periods ofball bearings operating under light loads at high speeds andelevated temperatures.5.Apparatus4,55.1 Test Spindle6(see Figs.1-4),capable of operating atspeeds of 10 000 r min and temperatures as high as 371 C(700 F).The test bearing seat dimension shall be 19.99 mm to20.00 mm(0.7870 in.to 0.7874 in.).For spindles having thetest bearing and the support bearing in the same housing(CRCType,Fig.1,Fig.2,and Fig.4)the internal construction of thespindle shall be such that the outboard support bearing,or bothbearings are free to float axially in the housing.In designswhere both bearings are free to float,the spindle shaft shallhave a 0.508 mm to 0.762 mm(0.020 in.to 0.030 in.)free axialmovement or end play.The outboard bearing seat dimensionshould be 19.99 mm to 20.00 mm(0.7870 in.to 0.7874 in.).5.1.1 The test unit design should be such that a finger springwasher(Fig.1)and a Z-Spring washer(Fig.2)produces a 22 Nto 67 N(5 lbf to 15 lbf)thrust load on the floating outboardsupport bearing.7,55.2 Bearing Housing:1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.G0.05 on Functional Tests-Temperature.Current edition approved Nov.1,2020.Published November 2020.Originallyapproved in 1975.Last previous edition approved in 2020 as D3336 20a.DOI:10.1520/D3336-20B.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American Bearing Manufacturers Assoc.,2025 M St.,NW,Ste800,Washington,DC 20036.4Complete apparatus is available from Falex Corp.,1020 Airpark Dr.,SugarGrove,IL 60554.5If you are aware of alternative suppliers,please provide this information toASTM International Headquarters.Your comments will receive careful consider-ation at a meeting of the responsible technical committee,1which you may attend.6Pope Machinery Corporation Grease Test Spindles No.P-1911 or P-6301A-HT(Fig.1)and No.P-7605-B(Fig.2);and Falex Corp.spindles of the type shown inFig.1 and Fig.3 have been found satisfactory for this purpose.7The sole source of supply of the apparatus known to the committee at this timeis Falex Part No.643-187-070,Falex Corp.1020 Airpark Dr.,Sugar Grove,IL60554.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued