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.
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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
