>> P.314
Balldiameter10mmDiameterandlengthofroller10mm×10mmPreloadamount:Equivalentto0.05×C0Ball(withoutpreload)Ball(withpreload)Roller(withoutpreload)Roller(withpreload)100020003000LoadN201510500Elasticdeformationm3.giFPreloadandelasticdeformationbehaviorPreloadObjectivesofpreloadInsomecases,thelinearmotionrollingguideisusedwithclearancegiventothelinearmotionrollingguidewhenlightmotionwithsmallloadisrequired.However,forsomeapplications,itmaybeusedwithplayintheguidingmechanismremovedorwithpreloadtoincreaserigidity.Preloadisappliedtothecontactpartsofaracewayandrollingelementswithinternalstressgeneratedinadvance.Whenaexternalloadisappliedonthepreloadedlinearmotionrollingguide,shockabsorbingwiththisinternalstressmakeselasticdeformationsmaller,anditsrigidityisincreased.(SeeFig.3)PreloadsettingPreloadamountisdeterminedbyconsideringthecharacteristicsofthemachinesorequipmentsonwhichthelinearmotionrollingguideismountedandthenatureofloadactingonthelinearmotionrollingguide.Thestandardamountofpreloadforlinearmotionrollingguidesis,ingeneral,approx.1/3ofloadwhentherollingelementsareballs(steelballs)andapprox.1/2ofloadwhentheyarerollers(cylindricalrollers).Ifthelinearmotionrollingguidesarerequiredtohaveveryhighrigiditytowithstandvibrationorfluctuatingload,alargerpreloadmaybeapplied.Forapplicablepreloadamount,seeTable9.Fordetails,seeanexplanationofeachseries.PrecautionforpreloadselectionEvenwhenhighrigiditymustberequired,excessivepreloadshouldbeavoided,becauseitwillproduceanexcessivestressbetweenrollingelementsandraceways,andeventuallyresultinshortlifeoflinearmotionrollingguides.Itimportanttoapplyaproperamountofpreload,consideringtheoperationalconditions.Whenusingwithalargepreload,contactIKO.isTable9SeriesandpreloadamountPreload(preloadsymbol)SeriesnameC-LubeLinearWayMLLinearWayLC-LubeLinearWayMLV(1)C-LubeLinearWayMVC-LubeLinearWayMELinearWayEC-LubeLinearWayMHLinearWayHLinearWayFC-LubeLinearWayMULLinearWayUC-LubeLinearRollerWaySuperMXLinearRollerWaySuperXLinearRollerWayXClearance(TC)Clearance(T0)Standard(Nosymbol)Lightpreload(T1)Mediumpreload(T2)Heavypreload(T3)--○○-----○---○----○-○○○○○○○○-○○○○○○○---○○○-○○----○--○○Note(1)Preloadisadjustedtohavesubtleclearanceorminimalamountofpreload.1N=0.102kgf=0.2248lbs.1mm=0.03937inchⅢ-20
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