On Saturday 26 May 2018 07:40:05 andy pugh wrote: > On 25 May 2018 at 07:24, jeremy youngs <jcyoung...@gmail.com> wrote: > > https://www.mouser.com/ProductDetail/CUI/AMT103-V?qs=sGAEpiMZZMsWp46 > >O%252bq11Wc6D0rLp%252bQH%2fN7GEqDkL%2fc8%3d Any thoughts? Seems like > > a good solution > > I was expecting Jon Elson to chip in. I think he found an odd > accelleration lag with these encoders: > > https://sourceforge.net/p/emc/mailman/emc-developers/thread/4DFC13BB.4 >020109%40pico-systems.com/#msg27669457
I vaguely remember that thread, 2-4 years ago, thank you for the reminder and link. All of my home-made efforts have been magnetic (ats667's in the sheldon lathe watching its 60 tooth main gear, but no PID's, just feedback for rigid tapping), or opto-interrupters in the others. This Omron was not mentioned in that thread, perhaps its newer? But it seems to be far smoother at controlling a motor, so much so that on the mill, I have used Pgains of 40 in its PID, whereas with the combined mechanical errors and such of the home made opticals, Pgain was very limited, 3 maximum, and even then the quantization noise was hammering the gear teeth in the g0704's head, making it sound like every bearing in the head was hammered flat. The difference in the noise level when running is amazing. Below 500 rpms, I have to look at the spindle nose or tool to verify its running, its that quiet. Its self contained, so I have no clue what technology is used internally, and its just over a $20 bill on ebay. Perhaps someone could do similar tests on one of those. I am, for just small change, very impressed with the single such device I have. Its made a whole new machine out of a noisy rattle-trap. But because it is not on the spindle, its on the back of the motor, I am using only its a/b outputs, the index is still coming from the home-made opto-interruptor that is on the spindle. off-topic bragging, I have some switches on the gearshift knob and some hal magic to correct for the gear changes of coarse. And I made use of that to add a setp to the neither switch closed state so the motor is turning at about 20 rpm's when the gear is in neutral but is supposed to be running. I can reach up and change gears at 1400 revs, its down to about 20 motor shaft rpm's long before the gear is disengaged, and because the motor is turning, the next gear engages silently, bringing the motor back to selected speed when the switch closes, indicating full engagement. None of the grab the spindle and turn it by hand coaxing the gears to re-engage. -- 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
