On Friday 11 December 2020 20:33:16 andy pugh wrote: > On Sat, 12 Dec 2020 at 00:37, Gene Heskett <ghesk...@shentel.net> wrote: > > The touch off works, but zero isn't zero. Where or what do I look > > at? > > Some I-gain might pull in the last little bit. Or you can display > "commanded" rather than "feedback" and not see the (tiny) error.
The error is pretty noisy yet, but when just creeping, the encoders quantization seems to be an almost random amount averaging .0015 degrees. Even when displaying commanded. OTIH, that's not a heck of a lot of error. And its strangely similar in magnitude to the FF1 that cruises with near zero error at 1500 degrees a sec, and that's 17.6, but I've not investigated the effect of a 2nd decimal there. I'll be dealing with a lot more friction when its actually on the BS-1. I did get a notched gnawed in the spindle hub, behind the index plate and hopefully out of harms way once its wired up and the index plate reinstalled. With a microswitch JBWelded so it will be a home switch. But that epoxy is slow when something opened the garage door and left it open for several hours last evening. At 23:30 when a neighbor called to advise me the door was open, several thousand pounds of masonry and machines was down to about -5C. I plugged in a second heater in, but it was only up to about 24C when I came in for the night tonight. That much mass takes a day or so to get warmed back up. Another thing I did while shivering in shirtsleeves was JBWeld a 4" box plate with two 40 amp Crydom style relays glued to it, to a 4 & 11/16" box cover so there was room for the 3/4" clips to hold some 12/4 SJ style line cordage so serve as a LCNC controlled power switch for that 250 volt VFD for the new 2.2kw motor I'm putting on the 6040 mill. The OEM motor has about used up its estimated 100 hour runtime and is getting noisy, bearings shot. OTOH it carved those 2 motor mounts out of 1/2" alu, and did a beautiful job of it. By tomorrow I should be able to finish that piece up. So I'm "working" for some definition of the term, on 2 projects. Thanks 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) 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
