On Wednesday 25 November 2015 11:50:46 Jon Elson wrote: > 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.
Thats close to wide open with your pwm servo driver, 2750 is nailed to the floor. Stock 1 HP PMDC motor on a G0704. And it just died mid job. A small router plugged in beside it also is silent. Data on a halmeter going into the pwmgen looks ok, boot module cycles like it should, but nothing is getting to the motor. That power pack is up on a high shelf, and will take some housecleaning in front of it, and rigged with my deer hoist to get it down for any further inspection. And my back is done for the day, so its tommorrow (turkey day on this side of the pond) or Friday to get it rigged up on a table for open top testing. > 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. Tell that to grizzly. :( I did get a set of plugs made for the outer, long plugs in the lids at 4 per lid, 3 lids today, and was just starting on the next shorter plug, also need a dozen of those, but I switched the code to use a 1/16" mill. Much stronger. s/b 4x stronger. But have not tested it, spindle motor stopped first. Trucking along at 18-20 ipm, cutting about 18 thou deep per loop, and keeping the slot blown clear with an air hose seemed to help, but wasn't the total solution. At 2 ipm, its making black face powder, very fine dust. It looks much more like fine sand or sawdust at the faster speeds. Thanks Jon. > 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 Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ 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
