Catalog – Components - Allied Automation, Inc.

Design ConsiderationsLoad CapacitiesDeflectionThe equations below can be used when applying LINTECHclosed linear bearings (LBC, SLBC, or DLBC series), casehardened shafting (SL series), with shaft end supports (ESseries), or with threaded shaft ends attached to a plate oneach end. The estimated deflection that a configuration willexperience is dependent upon the shaft diameter, unsupportedshaft length, shaft material, and the type and numberof bearings being used.Minimizing the deflection of the components will reduceadditional stresses which can lead to premature failure.Excessive deflection can cause binding or rough operationwhen the bearings are at the area of travel furthest from thesupported portion (mid-stroke).ModelNumberSL4SL6SL8SL10SL12SL16SL20SL24SL32NominalShaftDiameter(inches)0.2500.3750.5000.6250.7501.0001.2501.5002.000ShaftWeightT(lbs/in)0.0140.0310.0550.0860.1250.2220.3480.5000.890StrengthFactorS k(psi)5,70029,10091,800224,400465,0001,470,0003,594,0007,455,00023,562,000One (1) bearing per shaft1/ 2 LLWL 3D = +48 Sk5TL 4384 SkTwo (2) bearings per shaftLS k= strength constant - modulus of elasticity x moment of inertiaC CW2W2D =WC(3L 2 - 4C 2 ) 5TL 4+48 Sk 384 SkD = deflection (inches)W = user applied load (lbs)L = length of unsupported shaft (inches)C = distance from support to center of first bearing (inches)T = total weight of unsupported shaft length (lbs)A-16LINTECH ®Positioning Components