On Monday 14 December 2020 19:50:58 Peter C. Wallace wrote: > On Mon, 14 Dec 2020, Gene Heskett wrote: > > Date: Mon, 14 Dec 2020 19:34:36 -0500 > > From: Gene Heskett <[email protected]> > > Reply-To: "Enhanced Machine Controller (EMC)" > > <[email protected]> > > To: [email protected] > > Subject: [Emc-users] calibrating the BS-1 battle > > > > Greetings all, math whizes in particularly; > > > > I couldn't keep the halmeters out of floating point for displaying > > integer numbers when testing at 75+ turns, and I just spent several > > hours running it backwards because there is no reset to zero for the > > mesa encoders. > > setp hm2_card.0.encoder.nn.reset true > setp hm2_card.0.encoder.nn.reset false > > will reset the encoder position
I must have been looking in the wrong place, thanks Peter. > > > So the last attempt was only for ten trips past the home switch. > > That kept the halmeters out of sci notation. Tracking the encoders > > rawcounts with two sample-holds, first freezing the rawcount at the > > first switch passing, the second freezing the raw count at the 10-11 > > transition. Then subtracting the first from he second gave 2400114 > > rawcounts difference. > > > > Divide that by 10 to get 1 turns worth, then divide that by 360 to > > get 1 degres worth which is a scale of 666.6983333. > > > > Have I missed anything in my math? > > > > It seems to be working ok, even turns in the right direction now. :) > > With around 3 hours at max speed. the psu warmed a bit, the motor > > warmed a little more, maybe to 90F, the heat sink on the driver > > (Look for IBT-2 ON EBAY, its about $7) may have warmed 5F above > > ambient if that. Within its voltage limitations of nominally 27 > > volts, running on 24, no heat and it makes the motor do almost > > exactly what you asked. Oh, and claims it can handle a motor drawing > > 43 amps. > > > > Now if I could get rid of the bias in stopping points, it always > > stops about .0016 degrees lower than requested. From either > > direction. The almost in the previous paragraph. > > > > That is plenty close enough for the girls I've gone with. And my > > first attempt at making a servo work seems to be a success. It can > > move around 15 degrees a second which is slower than I'd like, but > > not by that much. > > > > Thanks all. > > > > 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) > > If we desire respect for the law, we must first make the law > > respectable. - Louis D. Brandeis > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > Peter Wallace > Mesa Electronics > > (\__/) > (='.'=) This is Bunny. Copy and paste bunny into your > (")_(") signature to help him gain world domination. > > > > _______________________________________________ > 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
