Comparing motion controllers...

[njhussey]

3 – I could let both ballscrews be driven from the same motor but I guess that would require a belt and with that I would loose some of the precision.

I use a belt and a single stepper and an IP-M and I'd say that I'm not losing any precision! I cut plastic bearings for work and easily hold tolerances down to 0.1mm (although plastic does creep after machining) and I'm sure if I cut some aluminium or suchlike I could hold better tolerances...in short what I'm saying is that a belt will not lose you precision but will mean that you can't rack your gantry and only need one homing switch not two....lots of pros and can't see too many cons (apart from having a long belt running at the back of my router.)