What kind of speeds do you want?
If you want speeds like Tribbles has, you are on the border line of servo /stepper.
The setup he has is the SY86STH156 and the PM2278 run with 110V AC. (If i remember right)
With this setup you are looking at about £250 per axis, and you will most likely need two ball screws on X or it can crab, even with profiled rail.
A servo system will be about twice this, but will be far more accurate and much more responsive.
Our servo systems have 2500 line encoders that are quadrature so you get 10000 pulses per rev, and these are actual encoder positions rather than extrapolated positions that you get with an open loop stepper system.
With a servo system then the actual backlash of the mechanical system becomes the weak spot rather than the accuracy of the motor.

Don’t forget with a servo system, you will need to gear it, and also consider the max frequency of Mach/parallel port, as this will be a factor in your max speed.


Quote Originally Posted by AdCNC View Post
hmmm, ok guys what motors would you recommend to spin a 1900mm of 25mm ballscrew? would you go stepper or servo? and what drives would you suggest using?