Some design questions

[JAZZCNC]

Thanks for the comments Jazz, but I don't agree with the bit about the motors, they are certainly strong enough to rip the threads out of delrin and jam the whole axis. I am considering belt drives with a 2:1 reduction, so this would double the torque and halve the speed, but the leadscrews will have a bigger pitch anyway.

I was meaning the Astrosyn motors not the existing ones.! . . . . Your idea regards 2:1 reduction is a good one if you don't need the speed and have a decent amount of volts on the motors.
Don't worry about timing belts stretching because other than initial settling in they don't if correctly tensioned and good quality belts.

[cropwell]

The machine will be sold as a package without PC as I want to build a new controller with 4 drivers and I can't get a matching driver for the existing 3 Tonman PD2064M's. I will repackage the BoB and drivers as there are 'features' on the kit that would be best taken off. So I am going to have to find out more about motors and drivers.