On Friday, 29 April 2022 10:04:38 EDT dave engvall wrote: > Being a suspicious kind of guy I'd hang an encoder on the shaft and > measure it. > Jon Elson makes an interface that passes thru the encoder counts on a > panasonic servo motor with your electronics background you ought to be > able to do the same for your servo. > Just thinking out loud which usually get me in trouble. So I'll open my > mouth, then duck and run. ;-) > Dave0.36333333333333333333333333333333333333333333333333333333333333333 > 33333 Opps! contribution from the CAT. > > On 4/29/22 6:01 AM, Thaddeus Waldner wrote: > > Gene, can you share a link to the motor you are using? > > > > Thanks > > > >> On Apr 29, 2022, at 3:46 AM, gene heskett <ghesk...@shentel.net> > >> wrote:>> > >> On Thursday, 28 April 2022 21:17:20 EDT gene heskett wrote: > >>>> On Thursday, 28 April 2022 19:35:44 EDT andy pugh wrote: > >>>> On Fri, 29 Apr 2022 at 00:20, gene heskett <ghesk...@shentel.net> > >>> > >>> wrote: > >>>>>> Surely you already know that? It's 360 x 100 x SCALE ? > >>>>> > >>>>> Sure Andy. But what is the scale? > >>>> > >>>> 200 * 16 * 40 * (60/53) / 360 > >>> > >>> But these motors are not 200, but 300, they are 3 phase, 1.2 > >>> degrees a > >>> full step. 300 steps per rev for full step. > >>> So by purely mechanical means, that would then be: > >>> 300 * 16 * 40 * [60/53] / 360, or 603.7735849 according to my > >>> TI-36X > >>> Pro. But thats about 5x what seems to be pretty close @ 125.xxxxx. > >>> Something, someplace is lying like a rug. But where? You got the > >>> hal > >>> file now, is it wrong? > >> > >> Two problems to fix before its right. > >> > >> 1. These drivers have two microstep modes, digital and apparently > >> powers of 10. Only one switch is on, sw3, which claims it makes a > >> full turn of the motor in 6400 steps. Just one problem. A 300 full > >> step per turn motor cannot be made to equal 6400 with any integer > >> multiplier. At /16, its not 6400, but 4800 steps per turn. A value > >> that's off either by .75, or 1.333333333333 depending on > >> interchanging the numbers. If it is truely actually 6400 > >> microsteps/turn, what the hell kind of math is it useing? Obviously > >> NOT a power of 2. I think these little magic boxes are miss- > >> marked. Obviously whoever drew up that silk screen was thinking in > >> terms of a 200 full steps per turn motor, and the 3 phase models > >> are 300, not 200. So that means 300*16 is 4800 steps per turn of > >> the motor shaft. No way in hell can I make the math work using > >> thier silk screened figures. > >> > >> So that's problem #1. And the correct answer can only be found if #2 > >> is a 1/1 answer. > >> > >> [edited] > >> > >>> I just found the stepgen drawings in the docs and I think my hal > >>> file > >>> is wrong, the values presented by the position.fb pins are not in > >>> the > >>> same units as .count's. position.fb has been scaled. > >> > >> 2. The $64k question then, since the step itself is not available to > >> hal for counting, is the stepgen a direct translator?, issueing 1 > >> full step per count it reports on the .count pin? > >> (yes/no) > >> If no, what is the ratio? > >> > >>> And this needs counts. I'll fix that when I get it back together. > >>> Then > >>> maybe it will make sense. > >>> currently stepgen3.counts is -173640, > >>> while stepgen3.position.fb is 1380.7 > >> > >> Fixed already, but not yet exersized for truthfullness. A sneakernet > >> mistake. :o( > >> > >> Thank you, Andy. > >> > >> 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, 1940) > >> If we desire respect for the law, we must first make the law > >> respectable. - Louis D. Brandeis > >> > >> > >> > >> > >> > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > 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, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
