On 9/5/2014 12:13 AM, Dave Caroline wrote: > 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
Longer stroke after each round of passes to bung the wedge in farther. Another method uses a threaded plug to push the wedge in to raise the cutter. That could be automated too by using a second rotary indexer with a hole into which the end of the plug fits. After each trip around all the grooves, run the tool farther out to engage the plug and turn it. Lock the indexer so it will remain aligned for the next adjustment. Either way simpler and on the fly adjustable VS the complicated ratcheting system that has to be rigged to only advance after the barrel is turned a full revolution. It might be possible to mount two or three or more cutters at once, combining the features (mainly speed) of button and broach with the fine accuracy of cut rifling. With three cutters a six groove barrel could be cut in only two passes between advancements of the cutters. For the group's next trick, automate the deburring and lapping process while at least duplicating if not surpassing the accuracy of hand lapping. ;-) --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com ------------------------------------------------------------------------------ Slashdot TV. Video for Nerds. Stuff that matters. http://tv.slashdot.org/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
