Mini Mill Conversion - best stepper drive choice

[m_c]

Ultimately it depends on how much performance you're hoping for.

Higher voltage will let you run faster, which on a ballscrew equipped mill of X2 size, probably wouldn't give you much performance gain, as the steppers wouldn't get up to high speed that often.

However, as you'll be using trapezoidal screws, which will have a smaller pitch, and be less efficient, you'll want to maximise torque, and most likely run at higher motor speeds. Which means higher voltage drives could be quite beneficial, but can you justify the extra cost?