Converting from RPM to Surface Speed In CNC Milling and Turning

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The Speed in both milling and turning operations comes from the rotation of the spindle. Rotation is typically reported as RPM or Revolutions per Minute but the speed that really matters in cutting operations is the relative velocity between the cutting edge of the tool, and the workpiece. In Milling It depends on the diameter of the cutting tool, and turning the diameter of the workpiece where it is interacting with the tool tip.