Selection of suitable milling machine for CNC conversion

[routercnc]

I wish we all had your wisdom:

I think he means that they can be back driven more easily from the cutting forces. Or for the Z axis may tend to drop under their own weight.
I think lead screws would be most likely be fitted over ballscrews on a manual machine just due to cost.

Yes avoid the round column as you loose position when adjusting in Z.

I’ve not looked at the sx2.7 but wm16 or 18 are top of my list should I get a mill as they look well made (and would match all the Warco stuff I have!)