2011/10/6 Robert von Knobloch <b...@engelking.de>:
>
> The 4th. axis (a revolving lathe chuck with it's axis parallel to 'Z')
> has its XY cooridinates at machine X0Y0.
> This is not where it is (in fact it is bolted to the T-grooves  and may
> be positioned anywhere on the machine bed).
> Do you (or anyone else) know how I can 'touch off' for want of a better
> term, the XY position of the 4th. axis?

I am not sure that I understand Your question.
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.
Chris Radek's page has some sample routines for touch probe:
http://timeguy.com/cradek/01262579508

Viesturs

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