>> P.259
CompliancewithISO13385-1:2019andJISB7507:2022ISO13385-1(theISOstandardofcallipers)wasrevisedandpublishedasISO13385-1:2019inAugust2019,andaccordinglybasedonISO13385-1:2019,JISB7507(theJapaneseIndustrialStandardofcallipers)wasrevisedandpublishedasJISB7507:2022inMay2022.Oneofthemajorpointsoftheserevisionsisthatspecificnumericalvalueshavebeenprovidedforindicationandinspectionmethodsregardingtheaccuracyofcallipers.Thisquantificationdoesnotaffectthequalityofcalipersmanufacturedinthepast,astheyweremeasuredandinspectedinanagreed,standardizedwayinlinewithcertainmethodsandcriteria.ThefollowingparagraphsexplainpointsandchangesintherevisedISO13385-1:2019andJISB7507:2022.PartialsurfacecontacterrorE(MPE)[ISO13385-1:2019,JISB7507:2022]Thepartialsurfacecontacterrorofacaliperisanindicationerrorappliedtooutsidemeasurement.TheISO13385-1:2019andJISB7507:2022standardquantifiesforeachmeasuringrangethetestingmethodandcriteria,suchastestpoints,numberoftests,andtestingarrangementthatwerepreviouslylefttothemanufacturers’owncriteria.(Fig.1,Table1)ISO13385-1:2019andJISB7507:2022TheShiftErrorforcalipersistheerrorofindicationforareasotherthantheoutsidemeasuringface.IntheISO13385-1:2019andJISB7507:2022standard,allmeasurementerrors(inside,depth,step,andI.D.measurementerror)otherthantheoutsidemeasurementerror(EMPE)areScaleShiftErrors(SMPE).TestpointsandtheirnumberwerenewlyquantifiedasthetypeoferrorsincludedintheScaleShiftErrorwerebetterspecified.(Fig.2,3,Table3)(Fig.2)Ex.)Stepanddepthmeasurement[ISO13385-1:2019]TestnumberingTestpoint(Table3)Referencestandard1Lessthan50mmGaugeblockScaleShiftErrormeasurementexample-depthmeasurement(Fig.3)Ex.)Foracaliperwithameasuringrangeof150mm,therevisedstandardrequiresfiveormoretestpoints.(Fig.1)ScaleShiftErrormeasurementexample-stepmeasurementForexample,fordepthmeasurementorstepmeasurement,thestandardspecificallyrequiresoneormoretestpointsatlessthan50mmandatestingarrangementusinggaugeblocks.(SeeTable3)Numberofpartialsurfacecontacterrortestpoints(Table1)MinimumnumberoftestpointsMeasuringrange(mm)15030010001000ormore5678Furthermore,therevisedstandardsrequiretestingin90%ormorepointswithintheproductmeasuringrangeaswellastestingattherootandtipofthejawatthemaximum/minimumpoint.Therefore,itisimportanttoconducttestsfollowingthenewlydefinedstandard.Thefollowingisanexampleofmeasurementfora150mmcaliper.TocomplywiththeISO13385-1:2019andJISB7507:2022standard,theminimumnumberoftestpointsisfivefora150mmcaliper.(Table1)FiveormoretestpointsarenecessarytocomplywiththeISO13385-1:2019andJISB7507:2022standard.Theseincludetestingatthemaximumandminimumpoint,aswellasattherootandtipofthemeasuringunit.Thesetestpointsmustadduptoatotaloffive.04-46
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