On 11/25/2015 06:21 AM, Gene Heskett wrote: > But in reducing the depth of cut from about 77 thou, to 21 thou in > deference to the fragility of a 1/32 end mill, I am probably not getting > the correct chip load, so at 2500 revs for a 2 flute 0.03125 diameter > solid carbide end mill, what would be a feed speed that would keep it > busy making decent sized chips for its size, but w/o overstressing the > mill? > > Or is 21 thou still too much dig in ebony? > > My rule, in aluminum, is to step down in Z about half the diameter of the end mill. This seems to work well down to 1/8". Not so sure about an end mill 4 X smaller, though.
I have this handy dandy slide rule type machining calculator, but it only goes down to aluminum from the really hard aerospace alloys. They suggest a chip load of .010" x the end mill diameter, so that would be a chip load of .0003" 2500 RPM is insanely slow for such a cutter, especially in wood. You need the high velocity impact of the cutting edge to slice the fibers before they deflect. But, the feed rate would be about 2 IPM to get .0003" per tooth with a 2-flute cutter. Jon ------------------------------------------------------------------------------ Go from Idea to Many App Stores Faster with Intel(R) XDK Give your users amazing mobile app experiences with Intel(R) XDK. Use one codebase in this all-in-one HTML5 development environment. Design, debug & build mobile apps & 2D/3D high-impact games for multiple OSs. http://pubads.g.doubleclick.net/gampad/clk?id=254741551&iu=/4140 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
