>> P.185
Ⅱ-177IdentificationNumberandSpecificationAccuracySinceoutsidediameterofexternalcylinderisdeformedbystopringtension,calculatethemeasurementpointfromtheequation(1)andusetheaveragediametervalueatthepoint.W=4+L1/8(1)where,W:istancefromtheendtomeasurementpointP,mm(seeFig.1)L1:Externalcylinderlength,mmL1WPStopringFig.1Table2oleranceofinscribedcirclediameterandoutsidediameterofexternalcylinderunit:μmNominaldimensionsofinscribedcirclediameterFworoutsidediameterofexternalcylinderDmmToleranceofinscribedcirclediameterFwToleranceofoutsidediameterofexternalcylinderDm(1)OverIncl.HighLowHighLow46+18+10──610+22+130- 81018+27+160- 81830+33+200- 93050+41+250-115080+49+300-1380120+58+360-15120150──0-18Note(1)Dmisanarithmeticmeanvalueofthemaximumdiameterandminimumdiameterobtainedbytwo-pointmeasurementoftheoutsidediameterofexternalcylinder.AllowanceofVelocityTheSTseriesiscapableofrotationandrotaryandlinearmotion.However,allowanceofvelocityforthesemotionsperformedatthesametimeisobtainedfromtheequation(2).TypicalvaluesareindicatedinTable4.DN≧Dpwn+10Sn1(2)where,DN:Allowanceofvelocity(seeTable4)n:Rotationalspeed,min-1n1:Numberofstrokesperminute,min-1S:Strokelength,mmDpw:Pitchcirclediameterofballs,mm(Dpw≒1.15Fw)Fw:Inscribedcirclediameter,mmHowever,applicablewhenn1≦5000,Sn1≦50000.Table4AllowanceofvelocityLubricationconditionsDNOillubrication600000Greaselubrication300000Table1ModelsandsizesofSTseriesShapeSealstructureModelSize4568101216202530354045505560708090100OpentypeST○○○○○○○○○○○○○○○○○○○○WithsealST…UU---○○○○○○○○○○○○○○○○○OpentypeST…B---○○○○○○○○○○○○○○○○○WithsealST…UUB---------○○○○○○○○○○○OrdinarytypeHeavyloadtypeTable3Toleranceofexternalcylinderlengthunit:μmNominaldimensionsofinscribedcirclediameterFwmmDim.L1toleranceofexternalcylinderlengthOverIncl.HighLow─200-20020600-300601000-400
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