Help with using long series endmills - CNCzone.com-The Largest Machinist Community on the net!

SteveGT4 · #1 12-12-2007, 07:28 AM

Hi, i have to mill a pocket 80mm deep in aluminium with a 10mm endmill. Is there a general rule of thumb as to how to adjust the speed and feed of a long series cutter compared to a standard lengh? I just managed to snap a brand new reduced shank 3 flute alu geometry endmill using the rpm my cam software gave me which was 6000 rpm (m/c's maximum) and i gradually crept the feed up. It got to probably no more than 100mm per min when the cutter shank broke. I didn't even get a chance to play with the rpm! Any recommendations?
Thanks
Steve

djr76 · #2 12-12-2007, 12:35 PM

How about 'Plunge roughing' the cavity out then do the finish pocketing/profiling.

dertsap · #3 12-12-2007, 01:58 PM

a broken tool wouldn t be caused by the feed or speed ,especially at 6000 rpm . what was the depth of cut and engagement

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