Not really sure I know what I mean either

Here's the idea I had...

I've been positioning the milling table by turning the leadscrews very precisely and trying to minimise backlash, it works okay.

I had a notion that if the milling machine could read the table and quill positions independantly of the screws, it could position it a lot better.

So I'm making a computer board that accepts g-code, reads the scales, turns the handles, plus a few other things that I think might be fun such as a pendant, tool height and X,Y absolute position gauges.

It's okay to tell me that it's already been done and is available for 50 bucks from Geekware Inc. I won't mind