Spindles are machinery subsystems that integrate shafts, bearings, and power-transmission components such as belts and ballscrews, motors, and in some cases, drives and controls to output axial rotation. Today, spindle designs are more sophisticated and customized, varying with the applications for which they’re used. Spindles are the core of the machine into which they’re integrated, so when a spindle fails, operations stop — causing lost revenue. Spindle maintenance can keep such machines operating at peak capacity by minimizing productivity disruptions.