Quote Originally Posted by Dave_stoke View Post
Google feeds and speeds calculator , it will take you to the little machine shop, input max spindle speed, material, mm/inch, cutter size and material and flute count. Hit calculate

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Yes, I have already looked at that. It's telling me 7k rpm and 2800mm/min for carbide and 1.6k rpm and 275mm/min for HSS. I was surprised at the difference beween the two cutter materials.