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DepthGagesDepthGagePerformanceMaximumPermissibleErrorofDepthMeasurementEMPE[JISB7518:2018]astheJapaneserevisedandissuedin2018indicatingIndustrialthefordepthgage,andthe“Instrumentalerror”JISB7518wasStandardsperformanceofadepthgagewaschangedto“Indicationerror.”Partialsurfacecontacterroristhemostimportantdepthgageindicationerror.Thethemaximumpermissibleerror(MPE).Inotherwords,MPEhasthesamemeaningastolerance.TherevisedcontentofJIS2018.inspectionmethodindicationerrorislimitedbyfollowingincludingdescribesthestandardtheTheMaximumPermissibleErrorEMPEofadepthgageisanindicationerrorappliedtodepthmeasurement.Table1showstheMaximumPermissibleErrorEMPEoftheindicationvalueofthepartialmeasuringsurfacecontacterror.ThemaximumpermissibleerrorEMPEforadepthmeasurementcanbeobtainedbymeasuringtheheightoftwoequallengthgaugeblocks,orequivalent,withaheightgageonaprecisionsurfaceplate(Fig.1)andthensubtractingthegaugeblocksizefromthemeasuredsize.Table1:MaximumpermissibleerrorEMPEofpartialmeasuringfacecontactofaconventionaldepthgage(Unit:mm)MeasurementlengthScaleinterval,graduationorresolution0.02or0.01±0.0250orlessOver50,100orlessOver100,200orlessOver200,300orlessOver300,400orlessOver400,500orlessOver500,600orlessNote:EMPEincludesthemeasurementerrorarisingfromstraightness,flatnessofthe±0.03±0.04±0.05measuringsurfaceandparallelismwiththereferencesurface.0.05±0.05±0.06±0.07±0.08±0.09±0.10±0.11GaugeblockHeightgageDepthgagePrecisionsurfaceplateGaugeblockPrecisionsurfaceplateFig.1:Measurementofpartialmeasuringsurfacecontacterror13-27DepthGages
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