Quote Originally Posted by Richard Gonzalez View Post
A question for you Gary:

I know servos have encoders and close their PID loop that way. Is it possible to instead set up the servo feedback to come from a linear encoder so it is based on the actual position of the axis and not the rotary position of the servo? I think this would provide the best overall accuracy. This would require the cnc controller (not each servo controller) be involved in the closed loop positioning.
Its very possible to use magnetic linear quadrature encoders as feedback for servos - most pick and place machines for electronics work this way. The servo controller take the input from one just as it would from a rotary encoder.