How it works
Cutting speed is the relative speed between the cutting edge and the material; tool makers give it for each tool–material pair. Spindle speed follows from it and the diameter. Use the tool diameter for milling and drilling and the workpiece diameter for turning.
Formula
n = 1000 · vc / (π · D) vf = fz · z · n Q = ap · ae · vf / 1000 t = L / vf
For turning, set the number of teeth to 1 and enter feed in mm per revolution; to estimate removal rate, enter the feed in place of the width of cut. Typical carbide cutting speeds: structural steel 150–250 m/min, stainless steel 80–150 m/min, aluminium 300–1000 m/min.
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