On Friday 20 January 2017 06:09:09 TJoseph Powderly wrote: > 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 > It doesn't google, tomp. Got a link?
> 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 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
