On Friday 03 February 2017 06:28:08 andy pugh wrote: > On 3 February 2017 at 11:19, Valerio Bellizzomi <vale...@selnet.org> wrote: > > With this interpolated motion there is no need for spindle reversal > > when tapping > > Yes, but, unless there is something very clever going on in those > animations, you need a cutting tool with zero lead. > I am about 80% convinced that you can#t do it with a standard tap.
You couldn't Andy. Unless you could somehow synchronize the spindle with the g2/g3 motion so it always presented the same cutting edge to the cut. But with a single point, multi-toothed tool, tapping a BIG hole is just some math. I have a tool but its minimum hole size for the start would likely be at least 100mm as its about .7500" across its tips. Any smaller than that and the threads would be widened by the tips of the cutter swinging into and back out of max diameter of the threads. That, for a decent thread, whole require the hole diameter to be at least 5x its diameter. Either that, or have the spindle mounted on some sort of a circle wobulator so the lead was simulated by tipping the spindle in time with the circular progression. Those tools in the video were obviously without any lead IOW. And likely not a 60 degree v. 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
