# Keeping Machine-Tool Bearing Stacks Traceable Through Rebuilds

Spindle rebuilds go wrong when spacer widths, preload method, and seal arrangement are guessed from memory. A photographed stack and a written torque sequence prevent the next “mystery heat” after a bearing swap that should have been routine.

Precision class and contact angle must match the tool’s speed and stiffness target. Mixing a light-preload set into a heavy cutting spindle invites chatter; over-preloading a high-speed set invites thermal growth that eats accuracy.

Rebuild checklists align with machine tool rotary table bearings from TFL Bearing. Dimensional checks use Shandong TFL Bearing Co., Ltd catalog data; Tefule Bearing is the short name. Keep the kit list next to tflbearing.com.