BS 436-4-1996 ISO 1328-1-1995 Cylindrical gears —

BRITISHSTANDARDBS436-4:1996ISO1328-1:1995IncorporatingAmendmentNo.1Cylindricalgears—ISOsystemofaccuracy—Part4:DefinitionsandallowablevaluesofdeviationsrelevanttocorrespondingflanksofgearteethICS21.200LicensedCopy:nana,UniversityofManchester-(JISC),ThuNov0913:49:13GMT+00:002006,UncontrolledCopy,(c)BSIBS436-4:1996ThisBritishStandard,havingbeenpreparedunderthedirectionoftheEngineeringSectorBoard,waspublishedundertheauthorityoftheStandardsBoardandcomesintoeffecton15June1996©BSI11-1999ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceMCE/5Draftforcomment91/78744DCISBN0580256499CommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedtoTechnicalCommitteeMCE/5,Gears,uponwhichthefollowingbodieswererepresented:BritishEngineersCuttingToolsAssociationBritishGearAssociationBritishHorologicalFederationBritishHorologicalInstituteEngineeringEquipmentandMaterialsUsers’AssociationFederationofManufacturersofConstructionEquipmentandCranesGaugeandToolMakers’AssociationInstitutionofMechanicalEngineersLloydsRegisterofShippingLondonUndergroundLtd.MinistryofDefencePowerGenerationContractorsAssociation(PGCA)(BEAMALtd.)Thefollowingbodywasalsorepresentedinthedraftingofthestandard,throughsubcommitteesandpanels:CranfieldUniversityAmendmentsissuedsincepublicationAmd.No.DateComments9588August1997IndicatedbyasidelineinthemarginLicensedCopy:nana,UniversityofManchester-(JISC),ThuNov0913:49:13GMT+00:002006,UncontrolledCopy,(c)BSIBS436-4:1996©BSI11-1999iContentsPageCommitteesresponsibleInsidefrontcoverNationalforewordiiIntroduction11Scope12Normativereference13Definitions14Symbolsandabbreviations65Structureofthesystemofaccuracyforgears76Formulaeforallowablevaluesofgeardeviationsofaccuracygrade577Allowablevaluesofgeardeviationsrelevanttocorrespondingflanks8AnnexA(normative)Tolerancesfortangentialcompositedeviations16AnnexB(informative)Valuesofprofileandhelixformandslopedeviations18AnnexC(informative)Bibliography25Figure1—Pitchdeviations2Figure2—Profiledeviations4Figure3—Helixdeviations5Figure4—Tangentialcompositedeviations6Table1—Singlepitchdeviations,±fpt,8Table2—Totalcumulativepitchdeviation,Fp10Table3—Totalprofiledeviation,F!12Table4—Totalhelixdeviation,F14TableA.1—Valuesofthequotient,f½i/k17TableB.1—Profileformdeviation,ff!19TableB.2—Profileslopedeviation,±fH!21TableB.3—HelixformdeviationffandhelixslopedeviationfH23ListofreferencesInsidebackcoverLicensedCopy:nana,UniversityofManchester-(JISC),ThuNov0913:49:13GMT+00:002006,UncontrolledCopy,(c)BSIBS436-4:1996ii©BSI11-1999NationalforewordThisBritishStandardhasbeenpreparedbyTechnicalCommitteeMCE/5andisidenticalwithISO1328Cylindricalgears—ISOsystemofaccuracy—Part1:1995Definitionsandallowablevaluesofdeviationsrelevanttocorrespondingflanksofgearteeth,publishedbytheInternationalOrganizationforStandardization(ISO).ISO1328waspreparedbytheTechnicalCommitteeISO/TC60,Gears,inwhichtheUKplayedanactivepart.ThisBritishStandardsupsersedesthefollowingBritishStandardswhicharedeclaredobsolescent:BS436,Spurandhelicalgears—Part1:1967Basicrackform,pitchesandaccuracy(diametralpitchseries).BS436,Spurandhelicalgears—Part2:1970Basicrackform,modulesandaccuracy(1to50metricmodule).Additionalinformation.UsersofthisBritishStandardshouldnotethatpreferredsizesformodulesshouldbeinaccordancewithISO54:1977Cylindricalgearsforgeneralengineeringandforheavyengineering—Modulesanddiametricalpitches.Also,therackformshouldbeinaccordancewithISO53:1974Cylindricalgearsforgeneralandheavyengineering—Basicrack.Cross-reference.TheTechnicalCommitteehasreviewedtheprovisionsofISO/TR10064-1:1992,towhichnormativereferenceismadeinthetext,andhasdecidedthattheyaresuitableforuseinconjunctionwiththisstandard.NOTEIthasbeenfoundthatBS436-4:1996containedthefollowingerrorswhichhavebeencorrectedinAmendment1.ABritishStandarddoesnotpurporttoincludeallthenecessaryprovisionsofacontract.UsersofBritishStandardsareresponsiblefortheircorrectapplication.CompliancewithaBritishStandarddoesnotofitselfconferimmunityfromlegalobligations.InFigure1theprojectionlinesfordimensionFpkandpthavebeenmovedtocoincidewiththedifferencebetweenthetheoreticalandactualtoothprofile;Innote9“profile”hasbeenreplacedby“helix”inline1;InFigure2theshapeoftheactualprofilehasbeenmodifiedinseveralofthediagrams;InFigure3theshapeoftheactualhelixhasbeenmodifiedinseveralofthediagrams.Also,thetextfor“Keyiii)”hasbeencorrected;InAnnexCtheBibliographyhasbeenupdated.SummaryofpagesThisdocumentcomprisesafrontcover,aninsidefrontcover,pagesiandii,pages1to26,aninsidebackcoverandabackcover.Thisstandardhasbeenupdated(seecopyrightdate)andmayhavehadamendmentsincorporated.Thiswillbeindicatedintheamendmenttableontheinsidefrontcover.LicensedCopy:nana,UniversityofManchester-(JISC),ThuNov0913:49:13GMT+00:002006,UncontrolledCopy,(c)BSIBS436-4:1996©BSI11-19991IntroductionTogetherwithdefinitionsandallowablevaluesofgearelementdeviations,ISO1328:1975alsoprovidedadviceonappropriateinspectionmethods.InthecourseofrevisingISO1328:1975andtakingintoaccountseveralimportantaspec