What Speed or RPM should you use your Carbide Burrs?

The speed at which you use your carbide burrs in your rotary tool or die grinder will depend on the material you're using it on and the contour being produced, but it's safe to say you do not need to exceed speeds of 35,000 RPM. The table below shows some approximate speeds.

If the burs are chipping easily this could be due to the speed being too slow. However, it's ideal to start the cutting slow, increasing the speed as you go along. High speeds will prevent clogging in the flutes of your burrs.

Diameter of Burr RPM  
1.6mm or 1/16" 25,000 - 35,000  
2.35mm or 3/32" 17,000 - 26,000  
3mm or 1/8" 17,000 - 26,000  
6mm or 1/4" 11,000 - 16,500  
12mm or 1/2" 8,000 - 12,000  
16mm or 5/8" 7,650 - 11,500  

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