On 5 September 2014 03:04, Len Shelton <l...@probotix.com> wrote: > Here is the best machine design I could find that really demonstrates > the issue: > https://www.youtube.com/watch?v=L_yemjfgkE0
Well ,if that worked then a CNC version would. My concern would be with the torsional stiffness of the pull-rod. I think that the rifling lead might always have to be largely set by the cutter itself. To make cutter up-feed easier I think I would look at designs with a stationary cutter and a moving barrel. I am seeing two collet chucks with adjustable spacing on a rail that oscillates up and down a fixed cutter bar. This would allow the cutter bar to be anchored at both ends to double the torsional stiffness (at the expense of increased part-changeover time). You would need very flex-resistant cabling for the barrel-rotation motors in this scenario, unless drive to the barrel chucks was via a ball-spline for example. Hydraulic cutter feed might be worth investigating. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ 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
