There is some chance I may have damaged it (the end) early on when playing with higher speeds, but I could bore with it reasonably well, so I kept going. My end mill is now "dull" and slightly discolored, but "it's billed into the job".
Next time I'll likely use smaller cutter.ĭrilling with a cobalt drill was not too bad, but I could tell it was tough metal. Finally made the slots, then 50 thou side cut full depth - slow going, but better than the initial slot - then a finishing cut. It was slow going and when pushed (feed) the BP was shaking a bit. Kool-mist for coolent.įirst I milled a slot 20 thou depth with hand feed. I couldn't find any data on what the correct speed/feed setting were for milling, so I "winged it" - 1/2 inch 4 flute quality USA HSS cutter, about 600-700 rpm. I has to drill a bunch of 7/16th holes and mill 4 3 inch long 11/16 slots in 3/8 steel described as "T1" with my 2hp BP.
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