Many unwind and rewind stands require a constant surface payoff speed (i.e. FPM). The MS320 operating in the master mode and inter-faced with a line speed pulse generator such as our traction wheel encoder assembly, or a pulse generator mounted on a nip or idle roller will provide .02% accuracy. During operation the motor speed is constantly adjusted as the core diameter changes to maintain the setpoint. This ensures a consistent material flow from empty core to full spool "rewind" and from full spool to empty core "unwind." A load cell or dancer input can be used if tension should influence the process.