It is customary to set the bearings in preload as opposed to end play for machine tool spindles because preload removes looseness (play), adds stiffness, and seats the rollers to prevent skidding at ...

Precision-class tapered roller bearings (TRBs) offer the spindle designer an option for spindles with load ... Precision Class TRBs are typically set in preload and run at higher speeds. The lower ...