On Wednesday 08 November 2017 23:01:39 dave wrote: > On 11/08/2017 02:34 PM, Gene Heskett wrote: > > On Wednesday 08 November 2017 11:17:54 jeremy youngs wrote: > >> https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com% > >>2Fu lk%2Fitm%2F121287187940 > >> > >> This is a bit less wait time gene and may be easier to mount > > > > Debatable, the mount bolt spacing is only an inch, and that would > > put me drilling and tapping holes right into the motor bearings > > dust covers which are only 1/8th inch away. I can make a mount and > > an extension shaft) for the Omron with about the same labor. And > > without endangering the motor. The outside casting above its > > brushes can be drilled & tapped with a lot less worries. > > > > Thanks for the suggestion Jeremy. > > > > Cheers, Gene Heskett > > Playing devils advocate....would it be any easier to go analog; > tacho-generator. An op amp with a summing junction and maybe > some filtering is well withing Gene's skill set. The technology may be > old but it still works. > Advice is worth just what you paid for it. ;-) > > Dave
This is true. However, today I'd be tempted to put a wee bit of rubber between the motor shaft and another nema 12 motor, feeding that to a pair of schmidt triggers to get the quadrature output. With a hairs worth of give in the rubber coupling, the cogging would generate a good waveform at the output of the schmidts even at 1 rpm. It would be an interesting experiment. I at one point, and may finish it eventually, made what was going to be a 4 axis jog box using those teeny motors as the signal generators, but then realized I didn't have near enough i/o in a 5i25 to hook it up, so its all in a box in the basement waiting for more i/o to magically appear. About 14 or 15 wires I figure. A 7i90HD with a triplet of 7i42TA's would be nice but north of $200 too. > ---------------------------------------------------------------------- >-------- 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 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
