petermichaux wrote:

Recently, I was exposed to the idea of driving a quill with a ball screw and
not a rack and pinion like on my mill/drill. In this situation would the
ball nut be fixed to the quill and the screw turned by a motor just like a
table leadscrew? This seems like a complicated arrangement because the
ballscrew needs end supports.

On a verticle knee mill like a bridgeport with stock cnc capabilities is the
quill driven by rack and pinion?

How is it done on a VMC?

Thank you,
Peter