Well i was planning on cutting woods and none ferrous metals!

Ive been looking at the 25mmOD ballscrew and im leaning towards that! as for the motors being not power full enough i can gear them to something like a 5:1 or more and get a 20-25 pitch ball screw!

What do you guys think!
Did you mean none or some? Gearing will definatley help with the motor power and accuracy (200 steps at 5:1 is 0.025 resolution) but will also slow the travel time down. Max stepper RPM is 350 ish I think

If your using belts then you might also want to check the 5:1 ratio, sounds a bit high. the small pulley will not have enough teeth in mesh if the bigger pulley is to large. Ive got a calculator at work so if its any help I'll post it tommorow.

Hope you dont think I'm being negative but I had to make the same decisions for my build. I chose Slow and accurate because Im only using it to build the fast machine :heehee:

Have you concidered rack and pinon? its cheaper and very fast.