I have made up a tool height setter. Its a bit rough but I will make a better one when I get more time.
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The basic parts. The centre of the top section was a bit off so doesnt look quite right.


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Hole drilled and tapped to PG7 to accept the cable gland.


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The block was cleaned up a bit on the lathe and the inner edge recessed to accept the switch locking nut.

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The finished parts before assembly.
I have also set up the block in USBCNC and calibrated and tested it. Working fine it is.

Regards

Ian