Hello group, First question is should a stepper motor have some rough spots when rotating by hand? I know I can fill the different degrees by hand but if I spin it real fast by hand I can feel some places are more rough feeling. Does this mean that the motor is bad? The x axis moves freely when the motor is off of the machine but with the motor on the machine it has rough spots. What got me looking at this is I was running a program and the toolpath was all over the place. I don't think it is the controller. Does anyone know where to get a new stepper motor?

Stepper Motor: 57HD5401-14SB 1.8degrees 3. OA N1405

Does anyone know what NEMA number this is and how to interpret what the motor is?

Thanks in advance.
Eric