>> P.280
HeightGagePerformanceEvaluationMethodJISB7517wasrevisedandissuedin2018astheJapaneseIndustrialStandardsoftheheightgage,andthe“Instrumentalerror”indicatingtheindicationerroroftheheightgagehasbeenchangedto“Maximumpermissibleerror(MPE)ofindication”.The“Instrumentalerror”oftheconventionalJISadoptsacceptancecriteriathatthespecicationrange(precisionspecication)equalsacceptancerange,andtheOK/NGjudgmentdoesnotincludemeasurementuncertainty(Fig.1).The“Maximumpermissibleerror(MPE)ofindication”ofthenewJISemploysthebasicconceptoftheOK/NGjudgmenttakingintoaccounttheuncertaintyadoptedintheISOstandard(ISO14253-1).Thevericationofconformityandnonconformitytothespecicationsisclearlystipulatedtousetheinternationallyrecognizedacceptancecriteria(simpleacceptance)whenthespecicationrangeequalstheacceptancerange,anditisacceptedthatthespecicationrangeequalstheacceptancerangeifagivenconditionconsideringuncertaintyismet.TheabovesaidinternationallyrecognizedacceptancecriterionisISO/TR14253-6:2012(Fig.2).ThefollowingdescribesthestandardinspectionmethodincludingtherevisedcontentofJIS2018.Fig.1ConventionalJISInstrumentalerrorJISB7517-1993SpecificationrangeNon-conformityrangeConformityrangeNon-conformityrangeMaximumpermissibleerrorofheightmeasurementEMPE[JISB7517:2018]Theheightmeasurementerrorinaheightgageistheindicationerrorwhenthereferenceedge(column)isperpendiculartothebasereferencesurfaceandthedirectionofcontactisdownward.Table1showsthemaximumpermissibleheightmeasurementerrorEMPE.EMPEforanydesiredheightisobtainedbymeasuringagaugeblock,orequivalent,withaheightgageonaprecisionsurfaceplate(Fig.3)andthensubtractingthegaugeblocksizefromthemeasuredsize.Table1:MaximumpermissibleheightmeasurementerrorEMPEofaconventionalheightgageMeasurementheight50orlessOver50,100orlessOver100,200orlessOver200,300orlessOver300,400orlessOver400,500orlessOver500,600orlessOver600,700orlessOver700,800orlessOver800,900orlessOver900,1000orlessScaleinterval,graduationorresolutionUnit:mm0.05±0.05±0.06±0.07±0.08±0.09±0.10±0.11±0.12±0.13±0.14±0.150.02or0.01±0.02±0.03±0.04±0.05±0.06±0.07Note:EMPEincludesthemeasurementerrorarisingfromstraightness,flatnessofthemeasuringsurfaceandparallelismwiththereferencesurface.AcceptancerangeFig.3:DeterminationofheightmeasurementerrorUncertaintyisnotincludedinjudgmentSpecificationrange=AcceptancerangeFig.2NewJISMaximumpermissibleerror(MPE)JISB7517:2018(ISO/TR14253-6:2012)SpecificationrangeConformityrangeAcceptanceNon-conformityrange(Rejected)UUUncertaintyrangeNon-conformityrange(Rejected)UUUncertaintyrangeWhenaconditionconsideringuncertaintyissatisfiedSpecificationrange=Conformityrange05-19GaugeblockHeightgagePrecisionsurfaceplateThe“Instrumentalerror”indicatingtheindicationerrorofJIShasbeenchangedto“Maximumpermissibleerror(MPE)ofindication”forthefollowingmodels:•SERIES192DigimaticHeightGagedescribedonpage05-7and05-8(Allmodels)•SERIES570ABSOLUTEDigimaticHeightGagedescribedonpage05-9(Allmodels)•SERIES570ABSOLUTEDigimaticHeightGagedescribedonpage05-10(Allmodels)•SERIES514,506StandardHeightGagewithAdjustableMainScaledescribedonpage05-11(Allmodels)•SERIES192WithMechanicalCounterdescribedonpage05-13(Allmodels)
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