Dear Viesturs

 > 1) start with existing thc component and adjust it - add
 > pyvcp/gladevcp panel with a spinbox or something similar to set the
 > offset value.

OK. So I could start with this simple example

   http://linuxcnc.org/docs/html/hal_pyvcp_examples.html

and change teh signals the buttons connect to halui.jog.2.minus and 
halui.jog.2.plus. What signal could I connect to to change Z position 
while running a program?

 > 2) modify trivkins or any other kinematics module, where the offset
 > value is added to the position of particular joint:
 > joints[n] = pos.x + offset

Hmm, I'll try 1) first, though I see the benefits of this solution.

See you
Flo

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