On 12/17/2013 08:29 PM, Jeshua Lacock wrote: > > > It looks like Max Velocity was at the default max (912 in/min) for that test, > but I confirmed it does the same thing with max velocity set way low like 16 > in/min. Turning MAX_VELOCITY down in the INI file will make it worse. OR, do you mean turning it down in the GUI (Axis?) Depending on LinuxCNC version, the GUI max velocity slider may not limit your rapid\feed (G0) moves! So, make sure you can move at the desired speeds in G1 first. If it only fails in G0, then it is most likely that you have set excessive velocities in your [TRAJ] section. > Interesting it would go that fast though because currently the limits I have > set for testing in the config file are far lower than that. E.g. that > MAX_VELOCITY for that drive is currently set to 30.5 and PID_MAX_VEL is set > to 30.65. My reading of the plot is about one vertical unit at .2" (200m) in half a second, or .4" per second = 24 IPM. That's a rough guess by eye. Also, the error trace is very suspicious! It hums along at a very small error (~.0005" or less) for the entire move, then suddenly surges to .010" or so when it trips the following error limit. The only thing I can figure is that the next command is for a MUCH higher velocity, which the motion hardware cannot perform. > > It does seem to stop on the same gcode line for any given gcode file. > That is also quite bizarre, if true. If the "same line" of the G-code file tells it to do something different, it would be odd for that to cause a fault.
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