On Tuesday 07 August 2018 17:06:20 Bengt Sjölund wrote: > https://a360.co/2vqj5lD > > Here is my first test, will 3D print tomorrow and see if I'm close or > not. > > Bengt
Looks good. The acid test is does it fit the scroll disk, and does it point at the scrolls exact center when it does fit. Do keep us posted please. All this has got me thinking, someplace in the last 15+ years since I bought that 7x lathe, I have managed to miss lay the reverse jaws for its original 3 jaw chuck, now mounted on a 4" rotary piece of junk. I might undertake to make a new set if the next time I need them, Mr Woods at LMS can't supply them. OTOH, that table is so far out of kilter, that chuck needs to be replaced with a 4 jaw independent so I can at least center the workpiece on its axis. > Den 2018-08-07 kl. 23:02, skrev Gene Heskett: > > 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 > > ---------------------------------------------------------------------- >-------- 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
