2011/10/7 Robert von Knobloch <b...@engelking.de>:
>
> From: Viesturs:
>> Do You want to be able to find the exact center of rotation of the > >
> rotary joint?
>> In that case You can mount a round part in chuck and then find its
>> center with touch probe.
>
> No, I know where the axis is but EMC doesn't, and I don't know how to
> inform it.
>
> Maybe there is a better kinematics setup for this configuration than
> 'trivkins', which I am using right now.

Ok, thanks, seems like I am starting to understand the essence of the question.
I think that You should follow Andy's advice of putting workpiece
coordinate origin (G54, G55 etc) in the center of the chuck instead of
putting machine coordinate origin there.
Especially, if You know, where the chuck is in machine coordinates,
then setting the offsets should be fairly easy. When working on a
part, it will make no difference, if You have moved only workpiece
coordinate origin, or You will have moved machine coordinate origin
and workpiece coordinates will match machine coordinates.

Viesturs

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