Backlash Instability on a system using linear encoders etc is eliminated in sophisticated systems using a improved dual loop system, this entails an encoder on the motor as well as a scale or encoder on the final load.
The Galil site has some excellent training video's, one on this very subject if someone wishes to see an in-depth explanation. They have improved their download site now so the video's are in a couple of formats.
By the way, how easy is it to implement a Motion control Card into EMC and has anyone done it.
Al
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.