I bought a half inch for work because we don't have enough steel cutters and I don't want to wait for high speeds. The end mill works as described. Full depth grooves, .15 radial pitch, 3000 rpm (390 fpm) in 1018 mills, .003 per tooth (30 fpm), this thing rocked. With no coolant, everything was fine. I still lubricate it with coolant but just wanted to try. You can make it run a lot faster if you want, just don't like how it screams. All old machinists shrink from the noise. Slotting I went .25 deep, 1400 rpm, .0035 (16 IPM) per tooth in 1018 and found it the best. Went deeper, faster and still works, just squirming the old heads. These were my first runs and everything worked perfectly.
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