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Yes after reflecting on what you said I am definitely running to aggressively to try to compensate for lack of torque. It seems to do just fine with lower speed and feed and the chips look better. I...

An FpT of ten thousands should work for Alu and Brass and given that the cutter is 2.17 inches dia then rpm = 12 / 3.1416 x cutting speed/2.17 should give a usable spindle speed should it not?...

I just got the Mill Arbor for a Sherline Mill and need the know the spindle speeds for a 16DP 55mm HSS involute gear cutter set. The big machines run these cutters slowly, around 100 RPM but I don't...