On Wednesday 21 March 2018 15:36:23 Ken Strauss wrote: > That is a little too large! My current need is to make some tapered > external threads for photographic cable releases: 28-degree included > angle, 0.5mm pitch, 3.75mm at the big end.
This mill I have, would do that just fine since its an external thread. However, those threads are relatively coarse considering the od. And since the taper angle is in essence limited by the pitch of the thread, and those things are rarely over 1/4" long, the 28 degree angle should be easily done. And for that I wouldn't hesitate to use a g76, and a threading tool in a vice, with the end terminal for the cable in a suitable collet (sp?) in the spindle of a mill. Or, since the tool is or can be moved by the x axis, and the cable release is in the z, a g76 with a long e l2 would do it just fine. Run the spindle in reverse with the tool reversed too and a z-3/16 or so, so the entry is at the top and the small end of the taper is on the bottom. G76 can do more than the man page talks about, just figure on cutting a couple buckets of air getting exactly what you want. ;-) Precutting the taper might be a good idea. See the g76, and how its invoked, in the code I did post, last cut at the bottom of that file. -- 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
