shaft coupling or timing pulleys?

[coinhunter]

In this moment I’m assembling my first CNC and I have some doubts about how to couple the motors to the axis, I’m going to build a small machine 70”x 40” x 20” and I have some 640 oz step motors and some screwballs to do it, however I wonder if it is OK to couple using shaft couplings or to use timing pulleys with some kind of relation, what is the best way to do it , thanks for your help.

[KenC]

have you dig the forum yet?

[coinhunter]

Yes, I did it.

[KenC]

Its your choice really. The beauty of engineering is nothing is cast in stone.

[MariusL]

Ball screws are best connected with a coupler that will relieve any misalignment. Unless your ball screw is very coarse, I would not reduce the coupling.