I want to DIY.. some questions please!

[motoxy]

2 ball screws means that both sides are controlled and this will stop the gantry squewing. I have a motor on each side. Mach 3 can link the two together. A single motor linked by belts to the two screws may have been a better choice as the screws are guaranteed to rotate equally.

you will find quite a few threads about this.

Bruce

OO look at me showing off and giving advice

[Jonathan]

OO look at me showing off and giving advice

Good advice :)

It's possible to put two motors on one driver if they're mechanically linked, but I wouldn't advise it. Either put one motor on each screw, or one motor and a long timing belts to link the two screws. The former should go a bit faster, since you have twice the input power with two motors, but in practice I doubt it will go that much faster as you have to guarantee neither motor stalls. Clearly if one does then the gantry skews, which depending on the magnitude could damage things. Once the machine is tuned properly either is fine as the motors will never stall.

I used two motors and two drivers since it would require a very long belt and several idlers to link the rotating ball-nuts.