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
