How to Choose Linear Bearings for CNC Machines
Start with the axis architecture
A compact auxiliary axis can use cylindrical or housed linear bearings, while a long router axis often needs more shaft support. Decide travel length and frame stiffness before comparing part numbers.
Three checks
| Parameter | Value |
|---|---|
| Travel and support | Long unsupported shafts can deflect; compare supported SBR/TBR rails when needed. |
| Mounting interface | SC blocks simplify bolt-on mounting; flange bearings locate directly in plates. |
| Contamination and service | Dust and chips change the value of seals, cleaning access and lubrication. |
Review a CNC linear-motion layout
Send the model, quantity, interface dimensions and application.