Brian wrote: > Jon, > > You idea would work, along with a number of others, so long as I > never disable the motors. The problem occurs when I disable the > motors and move the table manually. > > I think there is a stepper-driven system that works like this, using my Universal Stepper Controller. I know that this is trivial with my Universal PWM Controller. You can disable, move manually and then re-enable, and the coordinates are kept all the time. > The problem occurs because the only place to feed position feedback > that will work when the motors are disabled is through > axis.0.motor-pos-fb. > This value is then subject to inverse screw > compensation. The only way to make this work accurately is to zero > out all the screw and backlash comp. Theoretically, it will calculate > the screw comp and backlash in real time, but on my machine, I need a > feed forward component for accuracy. > OK, that is a different problem, and I guess the screw compensation has been put at the wrong place in the logic. And, I don't use the screw compensation, so I am blissfully unaware of the problem.
Jon ------------------------------------------------------------------------------ This SF.net email is sponsored by Make an app they can't live without Enter the BlackBerry Developer Challenge http://p.sf.net/sfu/RIM-dev2dev _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
