>> P.541
MaximumLoadingCapacityofMicrometerHeadsThemaximumloadingcapacityofamicrometerheaddependsmainlyonthemethodofmounting.Italsodependsgreatlyontheconditionsofusage,suchwhethertheloadingisstaticordynamicorwhethertheheadwillbeusedasastopper,forexample.Thereforethemaximumloadingcapacityofeachmodelcannotbedenitivelyspecied.TheloadinglimitsrecommendedbyMitutoyo(atlessthan100,000revolutionsifusedformeasuringwithintheguaranteedaccuracyrange)andtheresultsofstaticloadtestsusingasmallmicrometerheadaregivenbelow.MicrometerHeads1.RecommendedmaximumloadinglimitStandardtypeSpindlepitch:0.5mmSpindlepitch:0.1mm/0.25mmSpindlepitch:0.5mmHigh-functionalitytypeSpindlepitch:1.0mmNon-rotatingspindleMHFmicro-finefeedtype(withadifferentialmechanism)*Uptoapprox.19.6kgfonlyforMHTMaximumloadinglimit39.2N(4kgf)*19.6N(2kgf)39.2N(4kgf)58.8N6kgf)19.6N2kgf)2.Staticloadtestformicrometerheads(using148-104/148-103forthistest)(Testmethod)MicrometerheadsweresetupasshownandtheforceatwhichtheheadwasdamagedorpushedoutofthexturewithastaticloadwasappliedindirectionP.(Inthetestsnoaccountwastakenoftheguaranteedaccuracyrange.)(1)Clampnut(2)Split-bodyclamp(3)SetscrewclampPClampnutPLockingscrewPSplit-bodyclampMicrometerHeadsMountingmethodDamaging/dislodgingload(1)ClampnutDamagetothemainunitwilloccurat8.63to9.8kN(880to1000kgf).(2)Split-bodyclampThemainunitwillbepushedoutofthefixtureat0.69to0.98kN(70to100kgf).(3)SetscrewclampDamagetothesetscrewwilloccurat0.69to1.08kN(70to110kgf).Note:Theseloadvaluesshouldonlybeusedasanapproximateguide.13-14
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