New member lots to learn

[chillybo]

Welcome Chris!
If you use toothed belt drive from your steppers to your ball screws you can get the movement speed you want with pulley ratios.
I don't have a gantry machine, but if I did I'd couple the screws with pulleys and a belt to eliminate any chance of them getting out of step ;-)

I have got it rigged at the minute with a crude belt drive to drive the gantry ball screws (so i can move gantry up and down with a power drill while im building it). I have considered running it from one motor but when i move the timing belt (20mm wide 8mm tooth pitch) manually there seems to be to much resistance. Hence why im thinking of direct drive and slave method. If i do choose the latter im thinking of putting a thinner timing belt at the far ends of the ball screw just to mechanical sync the ball screws in addition to electronically slaving the motors (this would be a safety / gantry allignment consideration).