I would run at approximately 8000rpm, 20ipm and add lines to the program to helical through the part without returning to center and the last trip around would be just circular instead of helical (this last is not particularly important). I think you are running the spindle too fast and not enough feed for soft aluminum. I would do the same for soft brass/copper. Flood coolant or mist coolant either way would be just fine. WD40 is a great cutting fluid for aluminum. May fog the shop in a mist sprayer. Get an aerosol can and try it while cutting.
On Wed, Jan 30, 2019 at 10:53 AM Gene Heskett <ghesk...@shentel.net> wrote: > On Wednesday 30 January 2019 10:18:05 Stuart Stevenson wrote: > > > Are you cutting holes from solid or cutting the periphery of a shape? > > Drawing the outside edge of the tool in a circle, dropping the plug in > the middle most of the time, with z feed rates of about 10 thou per trip > around the circle. Panel is soft alu, about 80 thou thick. > > The subroutine used: > > ( arguments passed are #1 tool_rad, #2 holerad #3 xloc, #4 yloc, #5 feed > rate) > o130 SUB > G40 > F#5 (feed rate) > ( MAKE SURE IT CLEARS ) > G0 Z#<_ZUP> ( clear work) > ( go to center of hole ) > G0 X#3 Y#4 > ( drop tool close to work) > G0 Z0.02 > G1 F#5 X[#3 + #2 - #1] ( goto where edge of holestarts ) > G3 I[-#2 + #1] J-0.000 Z#<_ZDN> P12 (I've had as low as 8 for the P) > G1 F5 x#3 Y#4 ( back to center of hole slow as full depth cut in case > plug still there) > G0 Z#<_ZUP> (back to clear) > > o130 ENDSUB > > ZUP is about 40 thou above work, ZDN is about 30 thou into the spoil > board. Cherry in this instance, came from the scrap pile behind the chop > saw. > > [...] > > Thanks Stuart. > > 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> > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
