Depends on how much power you need (speed times force, acceleration and deceleration...) and how much stiffness you need (can't bend?). Also depends on how mu

Depends on how much power you need (speed times force, acceleration and deceleration...) and how much stiffness you need (can't bend?). Also depends on how much travel you need. It is easier to get 50 micron accuracy over a total length of 100 micron compared to a total length of 1 meter.