Bruce Klawiter wrote: > Sorry what I meant was .0005" between multiple parts > Sure, once you have it dialed in to the best click on the encoder, it should repeat quite well, except for thermal expansion. > The machine did not dither or do the jerking with the old Anilam > control.Someone said the axis might be drifting then snap back into position, > I put an indicator on an axis and it holds position and when it jerks it > moves about .002" out of position then back, hard to tell it so fast. > Yes, this jerking **IS** the problem, otherwise you are doing as well as the scale resolution permits. > The servo motor is connected to the ball screw with a timing belt and when it > jerks it sounds like the belt was snapped like a rubber band, you can also > feel and see it in the belt. > Ahhh, well, these belts need to be run VERY tight. I believe I am running with about 50 Lbs of strand tension on my Bridgeport with its very undersized 3/8" belts. Wider belts need even more tension. But, I don't think your problem really relates to the belts, due to that pic that showed a sharp disturbance on two axes at the same moment. I think that most likely is some kind of electrical disturbance, but can't quite put my finger on it.
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