CNC Router Bit Guide: Choosing the Right Tooling for Every Material

The right CNC router bit transforms a capable machine into a precision tool. With hundreds of bit geometries, coatings, and materials available, choosing the right tooling for your specific application is essential for achieving quality results and maximizing bit lifespan.

This guide covers the five most important bit types every CNC operator should know: flat end mills for profile cuts and pockets, ball nose bits for 3D contouring, V-bits for sign making and engraving, compression bits for laminated materials, and specialized aluminum-cutting end mills.

Material matching is critical. Using a standard wood bit on aluminum will produce poor results and potentially damage your machine. Conversely, aluminum-specific bits used on hardwood may leave burn marks due to their aggressive rake angles. We provide specific recommendations for each material category.

Proper feeds and speeds are the difference between bits that last 50 hours and bits that break in 30 minutes. While exact values depend on your specific machine rigidity and spindle RPM range, we provide starting-point charts for common material and bit combinations that you can fine-tune through test cuts.