On Wednesday 15 November 2017 09:59:35 andy pugh wrote: > On 15 November 2017 at 14:14, Gene Heskett <[email protected]> wrote: > > 1. How long, probably in cycles, does it take motion to recover when > > it finds a huge change in either its position, or velocity inputs > > which the scale switching causes? > > Unless it is actually using them at the time (being in the middle of a > feed-per-rev or spindle-synched move) it won't even be looking, so no > time at all. > Thats great!
> > 2. at what point does the accumulated position overflow? > > Never. (for practical purposes). > A 1024 count encoder at 10,000 rpm will overflow in 3 million years. At which time none of the 3 of us (me, motor or encoder) will still exist to give a s.... :) So this should all work ok if I don't screw up the hal file too badly. Its currently loaded with comments explaining what it does, but even with those excised its still 600 lines. While I am waiting on the encoder, perhaps I can get the A axis working since I've moved the stuff that was on those pins to the 5i25 p2 connector. Probably by building yet another box for a psu and a 2m542 driver. But I'll jury rig the 2m542 off the existing supply for x&y first to see if it goes into foldback with a third motor on it. No room left in the big box for a third 2m542 though without seriously impinging on my ability to get to the bob. I should have made it 4" bigger in all 3 dimensions but its final size was determined by the 1/8" sheet stock I had on hand at the time, most of which was the surviving, nearly flat stock out of the sides of a big wrecked ups step-van. I've since acquired some of the paneling from an old Townsend tv transmitter and have another piece or 2 wedged into a stashing place beside the garage door. But first, feed Dee again and go get the papers. 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
