>> P.25
SelectionofCRWSeriesForselectionofCRWseriesspecifications,strokelengthandthenumberofcylindricalrollers,aswellasaccuracy,loadratingandallowableload,mustbedetermined.StrokelengthandthenumberofcylindricalrollersStrokelengthoftheCRWseriesaffectsthewaylengthandthenumberofcylindricalrollers.Therefore,selectspecificationsbyfollowingtheprocedurebelowtakinglengthusedandappliedload.intoaccountthestroke❶CalculationofwaylengthThewaylength,whichshouldbe1.5timeslongerthanthestrokelengthused,isobtainedfromtheequationbelow.L≧1.5S(13)WhereL:WaylengthmmS:Strokelengthusedmm❸CalculationofcagelengthandthenumberofrollersWiththewaylengthandmaximumstrokelengthdetermined,theallowablelengthforcagecanbecalculated.Calculationmethodofthecagelengthvariesdependingonspecificationsofendscrewsandendstopperfittedtothewayend.(1)WithstandardendscrewsandendstopperSA(excludingSize1series)Thedimensionsbetweenrollersatbothendsisobtainedfromthefollowingequationbyusingavalueobtainedbysubtractingahalfofthemaximumstrokelengthfromthewaylength.LR=L-S12(15)WhereLR:AllowabledimensionsbetweenrollersatbothendsmmL:WaylengthmmS1:MaximumstrokelengthmmSL≧1.5SLS1S1/2LRS1/2L❷CalculationofmaximumstrokelengthIdeallythestrokelengthusedshouldbelessthan80%ofthemaximumstrokelength,whichisobtainedfromtheequationbelow.Thenumberofrollerstobeincorporatedinarollercageisobtainedbythefollowingequation.Z=LR-DWp+1(16)S1≧10.8SWhereS1:MaximumstrokelengthmmS:Strokelengthusedmm(14)WhereZ:Numberofcylindricalrollers(figuresafterthedecimalfractionsareomitted)LR:AlloweddimensionsbetweenrollersatbothendsmmDW:Diameterofcylindricalrollers(refertothedimensiontable)mmp:Inter-pitchdimensionsofcylindricalrollers(refertothedimensiontable)mmⅡ-17
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