On Friday 13 October 2017 18:21:15 andy pugh wrote: > On 13 October 2017 at 23:13, John Dammeyer <jo...@autoartisans.com> wrote: > > The desire for the Beagle with me was originally that with LinuxCNC > > and a quadrature encoder on the spindle along with the hardware QEP > > handled by the PRU we'd have an awesome little lathe controller. > > Alas, that's the one thing in MachineKit that hasn't been addressed > > yet. > > I lost track of Machinekit a while ago. Do they have any > encoder-counting facility in the PRU? > > If they have then the rest is just config. (editing text files...) > > > Mach3 and my ELS both use one pulse per revolution for threading. > > And before this starts a massive thread on how that just can't work, > > it does work and as long as the spindle is reasonably steady it > > works well. > > Indeed, and LinuxCNC can be persuaded to work that way too. > > > But you obviously can't just stop the spindle mid thread and then > > turn the spindle by hand manually. So there are limitations. > > LinuxCNC can do this (and yes, I am turning the spindle by hand): > https://www.youtube.com/watch?v=T4q8gCpeY1A
You can also rigid tap that way, by turning off the spindle power once the G33.1 has started, I have done it on TLM, easy because its spindle has AC ball bearings. Weird feeling to watch the carriage following the encoder, while you are turning the spindle by hand, in either direction. I've now built 3 encoders from scratch, all with 240 or more A/B edges per revolution. Usually works a treat. Or tells one quickly that its screwed up. 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
