Ahh, I see your point.

I know it doesn't solve your problem, but perhaps something like a PYVCP DRO
like the one shown here would be a good short term or alternative solution
http://wiki.linuxcnc.org/emcinfo.pl?PyVCP ( A big DRO from Goslowjimbo) I
haven't played with it much because my machine cannot be operated manually,
but it might be integrated into your config quite well.

Jon


> axis.N.motor-pos-fb (float, in) The actual position for this joint.
> >
> > as opposed to:
> >
> > axis.N.joint-pos-fb (float, out) The joint (as opposed to motor) feedback
> > position.
> >
>
> Because the screw comp gets added to that value before it becomes
> axis.N.joint-pos-fb.  The only way for this method to be valid is to
> zero out all the screw comp.
>
> Brian
>
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