>> P.25
Ⅱ-17SelectionofCRWSeriesForselectionofCRWseriesspecifications,strokelengthandthenumberofcylindricalrollers,aswellasaccuracy,loadratingandallowableload,mustbedetermined.StrokelengthandthenumberofcylindricalrollersStrokelengthoftheCRWseriesaffectsthewaylengthandthenumberofcylindricalrollers.Therefore,selectspecificationsbyfollowingtheprocedurebelowtakingintoaccountthestrokelengthusedandappliedload.❶CalculationofwaylengthThewaylength,whichshouldbe1.5timeslongerthanthestrokelengthused,isobtainedfromtheequationbelow.L≧1.5S(13)WhereL:WaylengthmmS:Strokelengthusedmm❷CalculationofmaximumstrokelengthIdeallythestrokelengthusedshouldbelessthan80%ofthemaximumstrokelength,whichisobtainedfromtheequationbelow.S1≧10.8S(14)WhereS1:MaximumstrokelengthmmS:StrokelengthusedmmSL≧1.5S❸CalculationofcagelengthandthenumberofrollersWiththewaylengthandmaximumstrokelengthdetermined,theallowablelengthforcagecanbecalculated.Calculationmethodofthecagelengthvariesdependingonspecificationsofendscrewsandendstopperfittedtothewayend.(1)ithstandardendscrewsandendstopperSA(excludingSize1series)Thedimensionsbetweenrollersatbothendsisobtainedfromthefollowingequationbyusingavalueobtainedbysubtractingahalfofthemaximumstrokelengthfromthewaylength.LR=L-S12(15)WhereLR:llowabledimensionsbetweenrollersatbothendsmmL:WaylengthmmS1:MaximumstrokelengthmmThenumberofrollerstobeincorporatedinarollercageisobtainedbythefollowingequation.Z=LR-DWp+1(16)WhereZ:umberofcylindricalrollers(figuresafterthedecimalfractionsareomitted)LR:lloweddimensionsbetweenrollersatbothendsmmDW:iameterofcylindricalrollers(refertothedimensiontable)mmp:nter-pitchdimensionsofcylindricalrollers(refertothedimensiontable)mmLLS1LRS1/2S1/2
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