On Tuesday 07 August 2018 16:48:47 jeremy youngs wrote: > > This brings up an argument against doing it aligned with an axis but > > s/b aligned at 45 degrees so there is never an axis direction > > reversal while the tool is within the material. Its been my > > experience, with the quality of machine and ball screws I can > > afford, that one can never get a completely invisible axis reversal > > although I do have bearings seated in such carvings, carved on a > > micro-mill after very carefully setting the XY axis's backlash. > > Sure, lay it out and generate the code aligned with an axis just > > because its easier that way, but mount the jaw holding vise at > > nominally 45 degrees, measure its angle with a touch probe and sci > > calculator, and rotate the co-ord map to match. That will move any > > direction reversals to outside of the workpiece. Voila! Perfect > > curves w/o any backlash artifacts. > > > > > But is you mill good enough to cut a spiral? Getting the g-code > > > is the easy part. > > > > > > > If you draw the spiral in cad, then choose a section of maximum > > > > radius, and minimum radius that a jaw 'tooth' will traverse. > > > > > > > > Now superimpose those two profiles and lop off any excess, > > > > keeping only the intersecting area. > > > > Repeat for all jaw 'teeth' > > > > Then hand code the segment > > Brilliant > Thanks for the flowers. :) > > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > 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> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
