Lin Engineering  introduced its new line of NEMA 17 dampers.  These dampers can easily be mounted onto standard NEMA 17 step motors. 

As motors step, inertia makes the rotor oscillate about its new position.  This natural back and forth movement might sometimes contribute to the erratic movement of motors.  The company says adding a Lin damper to the step motor’s shaft translates into smaller oscillations and thus, smoother motion.  This reduced step response time can ultimately result in much improved motor performance.