I have a Cincinnati Sabre 750 with a Fanuc spindle drive. The problem we are having is that the measured speed isnt the same as the comand speed. at 2000 rpm's it is really close and it gradualy gets farther away the higher you go. i have adjusted the gains to get it close, but here is where i dont understand at lower speeds it is lower than the comand speed. Any thoughts or help would be appreacited.