Catalog – Components - Allied Automation, Inc.

Design ConsiderationsLoad CapacitiesLoad direction factor - F LThe maximum travel life of a linear bearing or carriage assemblymay need to be derated depending upon the directionof the load as applied to the bearing. The Polar Chartsshown for each bearing type indicate the derating factor (ormultiplier) based upon the direction of the load applied tothe linear bearing. Not all bearings will see the same loaddirection, so you can use the adjacent equation to determinethe estimated life based upon the "heaviest" loaded bearingor the one which requires the greatest derating factor. Thiswill yield a life value showing the bearing which has thelowest overall travel length or life rating.To use the below graphs, simply find the intersecting pointbased upon the direction of the load (that the bearing sees)and then use the derating factor (i.e. 0.9, etc.), if any.L =F H x F T x F L xRF x SL = normal travel life millions of inches (or Km)R = rated dynamic load capacity of linear bearing, orcarriage at 2 million inches of travel (or 50 Km)F = user applied loadB = either 2 millions of inches (or 50 Km)F H= shaft hardness factorF T= environment temperature factorF L= load direction factorS = dynamic safety factor3xB90 90 901.31.1.9.7.51.31.1.9.7.51.31.1.9.7.5180 018001800.5.7.91.11.3LBC-4LBC-6LBC-8, SLBC-8, DLBC-8.5.7.91.11.3LBC-10, SLBC-10, DLBC-10.5.7.91.11.3LBC-12, SLBC-12, DLBC-12LBC-16, SLBC-16, DLBC-16LBC-20, SLBC-20, DLBC-20LBC-24, SLBC-24, DLBC-24LBC-32, SLBC-32901.31.1.9.7.5901.31.1.9.7.518001800.5.7.91.11.3LBO-8, SLBO-8, DLBO-8LBO-10, SLBO-10, DLBO-10.5.7.91.11.3LBO-12, SLBO-12, DLBO-12LBO-16, SLBO-16, DLBO-16LBO-20, SLBO-20, DLBO-20LBO-24, SLBO-24, DLBO-24LBO-32, SLBO-32Specifications subject to change without noticeA-10LINTECH ®Positioning Components