Chris Radek wrote: > On Mon, Oct 08, 2007 at 12:31:42PM -0700, Kirk Wallace wrote: > > >>My thinking is that INPUT_SCALE should not need to be adjusted by cut >>and try, so if the thread tpi is not correct, it must be an encoder >>problem? Maybe missing pulses or noise adding pulses? Thanks for any >>replies. > > > I agree, you definitely won't get it right by guess-and-check. The > motion.spindle-revs pin should be revolutions (mark the chuck, turn it > exactly ten revs, see if motion.spindle-revs increases by 10.0). > Yours will be off, you have to just figure out why after that. It > could be any number of things, including scaling and noise. If it > seems ok when you turn it by hand, but is bad when you run the spindle > for a while, it's surely noise. I had noise problems and knew it was > fixed when I could run my spindle for 15 minutes and then line up my > mark on the chuck and see motion.spindle-revs had increased an integer > number of turns. > > I recall someone having trouble with ppmc because there is a jumper > or switch that sets differential encoder mode, and he had it set > wrong. This caused noise problems. > That was a "real" PPMC board set. Kirk has a UPC which doesn't have differential inputs on the board. (He could have an outboard differential receiver, I suppose.) > 1250 seems like a strange number. Are you sure? (If that is right, > your 5000 setting is correct) How about 1728? That's what I have for a spindle encoder on the mini-mill.
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