Don Stanley wrote: >>> [TRAJ] >>> LINEAR_UNITS = inch >>> DEFAULT_VELOCITY = 1.0 >>> MAX_VELOCITY = 1.0 >>> DEFAULT_ACCELERATION = 1000. >>> MAX_ACCELERATION = 1000. >>> >>> [AXIS_0] >>> TYPE = LINEAR >>> MAX_VELOCITY = .25 >>> MAX_ACCELERATION = 500.0 >>> > "the faster moves were more unstable in the starts, stops and travel". > I think everything is going to be unstable when you are commanding slingshot accelerations from the machine, and it certainly can't do that. You HAVE to turn down this insane acceleration setting before you do anything else. 1000 Inches/second-squared means that at the end of the first second, the machine has accelerated to 500 inches/second velocity. That is 30,000 IPM. > With 127 pound mass on the cross feed and > 475 pound mass on the carriage the error builds up quickly if I don't give > it the maximum kick to start. > Well, no surprise there, you'd need many tons of linear force to provide these accelerations. If you could do it, the machine would flip over if not bolted to bedrock. > If it appears I don't know what I'm doing; that's what I think. > None of the documented procedures seem to work on my system Yes, if you have made a major misconfiguration, then there should be no surprise that the servo loop does not perform well. Again, I say I use numbers of 3 - 5 IPS^2 for acceleration on my systems. Try 5.0 and you should see much more reasonable operation. That still accelerates to 60 IPM in a small fraction of a second.
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