> 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 > > ------------------------------------------------------------------------------ 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
