>> P.552
NotesonUsingtheHeightGage1.Keepthecolumn,whichguidesslider,slidingbecomesdifcult,theclean.leadingIfdustordirtinerrorstoaccumulatesonsettingandmeasuring.it,2.Whenscribing,securelylockthesliderinpositionusingtheclampingarrangementsprovided.Itisadvisabletoconrmthesettingafterclampingbecausetheactofclampingonsomeheightgagescanalterthesettingslightly.Ifthisisso,allowancemustbemadewhensettingtoallowforthiseffect.3.Parallelismbetweenthescribermeasuringfaceandthebasereferencesurfaceshouldbe0.01mmorbetter.Checkthattherearenodustorburrsonthemountingsurfacewheninstallingthescriberorlever-typedialindicatorbeforemeasurement.Keepduringmeasurement.securelyscriberotherplacepartsxedandthein4.Ifthemainscaleoftheheightgagecanbemoved,moveitasrequiredtosetthezeropoint,andsecurelytightenthexingnuts.5.Becauseofparallaxerrors,alwayslookatthescalefromthefrontwhentakingreadings.6.HandlingafteruseCompletelywipeoffanywaterandoilandlightlyapplyanti-corrosionoilbeforestorage.7.Notesonstorage:Avoiddirectsunlight,highhumidityduringstorage.temperatures,lowtemperatures,andhighIfadigitalheightgagewillnotbeusedformorethanthreemonths,removethebatterybeforestorage.Ifaprotectivecoverisprovided,usethecoverduringstoragetopreventdustfromadheringtothecolumn.HeightGagePerformanceastheandissuedrevisedin2018Japaneseforheightgage,andthe“Instrumentalerror”JISB7517wasStandardsperformanceofaheightgagewaschangedto“Indicationerror.”Heightmeasurementerrorimportantheightgageerror.Theindicationerror(MPE).Inotherwords,MPEhasthesamemeaningastolerance.TherevisedcontentofJIS2018.themostlimitedbyinspectionmethodfollowingdescribesstandardisistheindicationthemaximumpermissibleerrorIndustrialtheindicatingincludingtheHeightGages3.LiftingofthebasefromthereferencesurfaceTheheightgage’sslidercanbemovedwiththedrivinghandleandadjustor.Aftertheslidercontactstheworkpiece,thebasemayliftfromthesurfaceplateifexcessivedownwardsforceisusedontheslider(measuringforceisapplied).Thisresultsinmeasurementerror.Foraccuratesetting,movethesliderslowlydownwardsuntilthescriberisjustfelttolightlytouchtheworkpiece.Alwaysmakecertainthatthesurfaceplateandheightgagebasereferencesurfacearefreeofdustorburrs.4.Errorduetoinclinationofthemainscale(column)AccordingtoJISstandards,theperpendicularityofthecolumnreferenceedgetothebasereferencesurfaceshouldbebetterthan(0.01+L1000)mmLindicatesthemeasuringlength(unit:mm)Thisisnotaveryonerousspecication.Forexample,theperpendicularitylimitallowableis0.61mmwhenLis600mm.Thisisbecausethiserrorfactorhasasmallinuenceanddoesnotchangetheinclinationoftheslider,unlikeawarpedcolumn.5.RelationshipbetweenaccuracyandtemperatureHeightgagesaremadeofseveralmaterials.Notethatsomecombinationsofworkpiecematerial,roomtemperature,andworkpiecetemperaturemayaffectmeasuringaccuracyifthiseffectisnotallowedforbyperformingacorrectioncalculation.6.Aheightgaugescribertipisverysharp.Handlewithcaretoavoidanypersonalinjury.7.Donotdamageadigitalheightgagescalebyengravinganidenticationnumberorotherinformationonitwithanelectricmarkerpen.8.Carefullyhandleaheightgagesoasnottodropitorbumpitagainstanything.HeightGages13-25
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