Hi Viesturs,
Nothing I envision is ever as simple or as good as I would hope: but
here goes:
Torch is attached to Z with a cylinder that slides in a close fitting
tube. Movement is limited in the -Z direction by a collar.
Close fitting tube can be clamped to restrict movement of the torch.
So: raise torch to easily clear work
unclamp torch which now slides to the collar limit and closes switch
-Z until torch touches work (switch changes state)
clamp tube
raise torch to working level.
I hope this makes sense. I'm certain someone can or already has come up
with something simpler.
Good luck.
Dave
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