One of the down sides is you have to do a mechanical conversion as well as CNC control.
I would not recommend anything but precision ground ball screws, you might get away with rolled, but you should definitely get the preloaded ball nut as without, rolled can have quite a bit of backlash.
If you buy a used CNC that size & needs a new controller, you get ballscrews, spindle motor and encoder etc. and possibly reuse servo's
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.