>> P.31
SelectingGaugeBlocks•Selectgaugeblocksinaccordancewiththecombinationrangerequired.Ifalargelengthisrequired,useoneormoreblocksfromalong-blockset.•Selectgaugeblocksinaccordancewiththeminimumlengthsteprequired.Addawearblockateachendofthestackiftheworkpiecematerialisabrasive,orifthestackwillbeusedfrequently.•Ifasetcontainingalargenumberofgaugeblocksisselected,thenumberofgaugeblocksrequiredforanyparticularlengthisreducedandthenumberofcombinationsisincreased.Accuracyoftheblocksinthesetwillberetainedlongerbecausenormalwearwillbespreadoveralargernumberofblocks.•Gaugeblocksetsdedicatedtomicrometerandcaliperinspectionareavailable(refertopage01-13fordetails).•Ifusingonlyonelengthrepeatedly,itisagoodideatopurchasediscretegaugeblocks(refertopages01-15,01-16,01-17,01-18,01-25,and01-26fordetails).•Productscanbeprovidedincombinationsotherthanthoseinourstandardsets.Whenplacingsuchorders,pleasespecifywhetherastorageboxisrequired.FeelfreetoconsultusifyouneedgaugeblockscompliantwithBritish(BS),American,orotherstandards.TheU.S.FederalSpecicationforgaugeblockswasreplacedbyASMEB89.1.9in2002.PleasecontactyourlocalMitutoyosalesofceforfurtherinformation.•2mm-basedgaugeblocks,whichtakethebaseoftheminimumlengthstepas2mm,areavailableandmanypeoplendthemeasiertohandlethan1mm-basedgaugeblocks.•AllMitutoyogaugeblocks,whethersoldinsetsorindividually,comewithameasurementinspectioncerticate.ConstructingaGaugeBlockStackThefollowingpointsshouldbenotedwhenconstructingagaugeblockstack:(1)Useasfewgaugeblocksaspossibletoobtaintherequiredlengthbyselectingthickblockswhereverpossible.(2)Selecttheblockfortheleastsignicantdigitrst,thenworkbackthroughthemoresignicantdigitsuntiltherequiredlengthisattained.(3)Therearemultiplecombinationsfortheintegerpartofalength.Topreventwearasmuchaspossible,donotalwaysusethesamegaugeblocks.Example:Requiredlength=45.6785mm•Fora1mm-basedgaugeblockset+)17.52545.6785mm1.00051.0081.172.00052.0082.17•Fora2mm-basedgaugeblockset+)14.52545.6785mmNote:Regardingthemethodforwringing,referto“QuickGuidetoPrecisionMeasuringInstruments”onpage01-37.(8)SuperiorMaterialCharacteristicsofCERABlockMaterialCERABlockTungstenCarbideZEROCERABlocksSteel(Fe)8009.3±0.5(WC-Co)(ZrO2)1350PropertyHardness(HV)Coefcientofthermalexpansion(10-6/K)Flexuralstrengthby3-pointbending(MPa)FracturetoughnessK1c(MPa·m1/2)Young’smodulus×104(MPa)Poisson’sratioSpecicgravityThermalconductivity(W/m·k)Note:Ceramicshavetheadvantageofaslowresponsetotemperaturechangesduetothelowthermalconductivity.However,196012020.60.37.854.42101.21300.32.53.71261.80.214.879.5(Lowthermalexpansion)20.60.36.02.910.8±0.50±0.0216505.5±1.0196012707826cautionisrequiredwhenusingCERAblocksunderconditionsofrapidtemperaturechange.(9)DifferenceinexpansioncoefcientbetweensteelandCERAblocksisjust1.5×10-6/KThethermalexpansioncoefcientofaCERABlockisquitesimilartothatofasteelgaugeblock.Differenceindimension(µm)171819321–1–2–3TungstencarbideCERABlock20212223Temperature(°C)Differencesinsizebetweenalternativegaugeblockmaterialsandsteelthatareobtainedwhenmeasuringoveralengthof100mmateachtemperature.(10)HighlyResistanttoDroppingandImpactDamageTheCERABlockmaterialisoneofthetoughestceramics.ItisextremelydifculttocrackaCERABlockinnormaluse.FeaturesofSquareGaugeBlocks(1)GaugeblocksinastackcanbeclampedtogetherAfterwringingsquaregaugeblocks,atierodcanbeinsertedthroughthecenterholetoclamptheblockstogetherforextrasecurity.(2)AheightreferencestandardcaneasilybemadeAprecisionheightreferencestandardcanbemadeeasilyandinexpensivelyusingaccessoriessuchastheplainjawandblockbase.(3)AdedicatedinspectionjigcaneasilybemadeAdedicatedinspectionjigforperiodicinspectionofinstrumentscanbemadeeasilyandinexpensively.(4)Awidemeasuringsurfacewithcross-sectionaldimensionsof24.1×24.1mmisavailable.Asquaregaugeblockretainsstableorientationbothlongitudinallyandlaterally.Awiderangeofapplicationsiscovered,includingcuttingtoolpositioning,anglemeasurementwithasinebar,tapermeasurementwitharoller,andinspectionofdepthmicrometers.LongandUltra-ThinGaugeBlocksMitutoyooffersextra-thingaugeblocksfrom0.10mmto0.99mm(incrementsof0.01mm)aswellaslonggaugeblocksupto1,000mmasstandardproducts.01-4
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