I don't mean to muddy the waters but I saw today some hacks to measure rpm using audacity to find the audible Hz of spindles. Too cool to keep secret. Same trick was used to balance propellers and discriminate which prop on an RC heli was causing vibration. I can imagine a slow non-rt speed control loop. HTDC ( hope that doesn't confuse :-) tomp tjtr33
On Jan 20, 2017 3:42 PM, "Gene Heskett" <[email protected]> wrote: > On Thursday 19 January 2017 19:20:26 andy pugh wrote: > > > On 19 January 2017 at 23:29, Gene Heskett <[email protected]> wrote: > > > The pdf docs don't mention it. > > > > Hostmot2 manpage does, though. > > > > http://linuxcnc.org/docs/2.7/html/man/man9/hostmot2.9.html#pwmgen > > Thanks Andy. Thats a whole class in cnc science all by itself. > > I think I'll see how it runs in PDM. That mode sounds interesting, and > would lend itself to CCS speed control a bit smoother. I'm also trying > to setup a spindle-at-speed signal based on the i/o diff of a lowpass > filter. Theory being that if the i and o values being a close enough, > the spindle is at whatever speed command was issued. But that will need > a minimum speed detector. Doable, put everything in low gear and feed > the motor 20hz and see what the tach says. My hal file is growing. :) > > I've not figured out how to set the pdm frequency yet, but I'm sure its > in there. > > 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 > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
