I have got hold of an Elliott Omnimill vertical mill (missing horizontal arbor).

I was thinking of converting to x,y CNC with a z drive on the quill, if I get that far.

So where to start? Should I use the dimensions of the existing leadscrews as a basis for new ballscrews or should they be larger diameter?

I suspect the most awkward part will be fitting the ballscrew support bearing holders to sufficient accuracy. (especially without any milling equipment!)

I do have a small emco lathe if that helps!

If this is going to be more or less impossible without significant machining of the knee and table, I may just have to settle for a DRO kit!

Any advise is welcome no matter how discouraging!

Cheers!