>> P.555
GaugeBlocksSelectGaugeBlockstobeCombinedtoMakeUptheSizeRequiredfortheStack.(1)Selection,preparationandassemblyofagaugeblockstackSelectgaugeblockswithconsiderationforthefollowingpoints:a.Usetheminimumnumberofblockswheneverpossible.b.Selectthickgaugeblockswheneverpossible.c.Selectrequired,andthenworkbackthroughthemoresignicantdigits.thathastheonefromleastsizethethesignicantdigitExample:For23.456mm23.456Example:For25.435mm25.435Third:Second:First:211.451.006LeastsignicantdigitFourth:Third:Second:First:221.41.031.005Leastsignicantdigit(2)Cleanthegaugeblockswithanappropriatecleaningagent.(3)Checkthemeasuringfacesforburrs.Wheninspectingforburrs,useanopticalatasfollows:Fig.1Fig.2a.Wipeeachmeasuringfaceclean.b.Gentlyplacetheopticalatonthegaugeblockmeasuringface.c.Lightlyslidedisappear.(Fig.1,Fig.2)Judgment1:Ifnointerferencefringesappear,itisassumedthattheretheopticalatinterferencetocheckfringesthattheisalargeburrorcontaminantonthemeasuringface.d.Lightlypresstheopticalattocheckthattheinterferencefringesdisappear.Judgment2:Iftheinterferencefringesdisappear,noburrexistsonthemeasuringface.Judgment3:Ifsomeinterferencefringestoandisgentlymovedatmeasuringopticalat,thereisaburrontheopticalat.fringesmoveface.theIfremainlocallywhilefro,aburrexistsonalongwiththethethe(4)Applyaverysmallamountofoiltothemeasuringfaceandspreaditevenlyacrosstheface.Wipethefaceuntiltheoillmisalmostentirelyremoved.Usegrease,spindleoil,Vaseline,orotherrecommendedoils.(5)Gentlyoverlaythefacesofthegaugeblockstobewrungtogether.Therearethreemethodstouse(a,bandcasshownbelow)accordingtothesizeofblocksbeingwrung:a.Wringingthickgaugeb.Wringingathickgaugec.WringingthingaugeblocksblocktoathingaugeblockblocksthegaugeblocksatthethemiddleCross90˚inmeasuringfaces.ofthegaugeblocksRotateforcewhileapplyingtogaugeSlideblocktocheckforafeelingofadhesion.slightthethem.themeasuringAlignwitheachother.facesOverlaponesideofathingaugeblockononesideofathickgaugeblock.bending,Topreventthingaugeblocksfromathingaugeblockontoathickgaugeblock.firstwringSlidethethingaugeblockwhileoverlappedpressingareatomeasuringfaceswitheachother.entirethethealignThen,wringtheotherthingaugeblockontothefirstthingaugeblock.Finally,removethethickgaugeblockfromthestack.Applyanopticalflattothesurfaceofonethingaugeblocktocheckthewringingstate.IrregularinterferencefringesWipetheexposedmeasuringface(s)andcontinuebuildingupthestack,inthesamemannerasabove,untilcomplete.GaugeBlocksDefinitionoftheMeterThe17thGeneralConferenceofWeightsandMeasuresin1983decidedonanewdenitionofthemeterunitasthelengthofthepathtraveledbylightinavacuumduringatimeintervalof1/299792458ofasecond.Thegaugeblockisthepracticalrealizationofthisunitandassuchisusedwidelythroughoutindustry.13-28e.Removeburrsbyreferringtothegures.Fig.3Fig.4BlockrubberBlckruerCERASTON(OrArkansasstone*1)ESONOArknsasstne*)CERASTON(OrArkansasstone*1)CRASTN(rAkasasston*1)(1)WipeanydustandoillmsfromthegaugeblockandtheCeraston(orArkansasstone)*1usingasolvent.(2)PlacethegaugeblockontheCeraston(orArkansasstone)*1sothatthemeasuringfacethathasburrsisontheabrasivesurfaceofthestone.Whileapplyinglightpressure,movethegaugeblocktoandfroabouttentimes(Fig.3).Forthingaugeblocks,useablockrubberthatmakesiteasytoapplyevenpressure(Fig.4).(3)Checkthemeasuringfaceforburrswithanopticalat.Iftheburrshavenotbeenremoved,repeatstep(2).Ifburrsaretoolarge,theymaynotberemovedwithanabrasivestone.Replacementwithanewgaugeblockisrecommendedwhenburrscannotberemoved.*1MitutoyodoesnotofferArkansasstones.
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