Mount the cutter bar on a rotary for controlled rotation, then a A plain g1A(rotation degrees)x(barrellength) would be what I would do.
I have done some very coarse helix cuts that way The taper wedge putting on the cut is interesting, that can be the same/similar just adjusting the out stroke as it runs Dave Caroline On 05/09/2014, Gene Heskett <ghesk...@wdtv.com> wrote: > On Thursday 04 September 2014 22:04:46 Len Shelton did opine > And Gene did reply: >> We have a customer who is wanting to make a motor controlled rifling >> machine. I spent a good bit of time researching it for him today and I >> was surprised that it seems that no one is doing it with motors (or at >> least I couldn't find anyone). I understand the need for the linear >> relationship of the cutter to the position of the indexer in such a >> machine. But I wanted to hear your guys thoughts on doing this with >> motors, which will inherently have some degree of granular positioning. >> >> Here is the best machine design I could find that really demonstrates >> the issue: >> https://www.youtube.com/watch?v=L_yemjfgkE0 >> >> >Len > > I don't see a thing there that cannot be done with steppers, nema 23's > driving the big pulley thru timing belts, with the rotation being a > variation of the G33.1 function. But I'd not use the pulley & crank at > all, but just a bigger stepper and ball screw because then you would not > need the math to translate the rotary motion into the linear position to > drive the G33.1 inputs. The biggest problem would be in adjusting the > number of grooves in software, but I don't believe that its a problem hal > or gcode cannot solve by running a start point cycle back and forth with a > mod function in the gcode math. > > Interesting problem, but one that I believe lcnc can do with creative > coding. But is cut rifling enough more accurate than the other two > methods, both of which are at least 100x faster, to make it worthwhile to > do it that way? Thats the $64K question. IMO yes. :-) > > I wish I knew I had 10 years left, I'd be getting started on just such a > machine. Just for S&G. And bug hole sized 10 shot groups of coarse. > > 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> > US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS > > ------------------------------------------------------------------------------ > Slashdot TV. > Video for Nerds. Stuff that matters. > http://tv.slashdot.org/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Slashdot TV. Video for Nerds. Stuff that matters. http://tv.slashdot.org/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
