>Actually, one of the reasons I wanted to build a controller/driver
>was to add a feature where I could directly control the steppers
>with left-right and fore-aft switches (sort of like power windows :-)
>where I could adjust the lathe without using G-Codes.

Would the PC software not then loose knowledge of just where the tool is, or
does it always work relative to current position?

As an alternative to what you suggest, I would have thought the arrow keys
on the PC keyboard would be sorted to do the same anyway, while the software
was effectively in "idle" mode.

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