So after doing some research it looks like I would have to replace the axis motors to go with Centroid. They have a pretty nice system that only works with AC servos, but the encoders are on the motor.

Currently the CHNC 11 has the encoders on the ball screws and there is a belt between the motor and the ball screw.

What is your feeling about the effect on accuracy if the encoders were on the motor with a belt driving the screws?

Thanks Gary