Spindle Speed

The machining and milling of metal is a precise art. It can be helpful to know a good starting point when you begin to machine or mill a piece of bar stock. This calculator provides a conservative starting point for spindle speed RPM based on the diameter of the drill or mill you are using. All calculations are conservative estimates, and proper care should always be used when machining metal. The developer assumes no liability for the improper implementation or accuracy of these estimates.