The model RG drive is not rated for shaft rotation. If your application requirements cause the Uhing drive to travel faster than 9.8 in/sec, the reversal mechanism may malfunction. If the Uhing RG drive reverses more than once every two seconds the same problem may occur. Conversely, if the application requires the Uhing drive shaft to rotate less than 10 RPMs, the same problem may occur. Correcting these problems is often a matter of finding the right combination of pitch setting and drive motor speed.