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How do External Linear Stepper Actuators work? Unlike Captive and Non-Captive Stepper Actuators, external linear actuators use a nut in addition to the usual threaded leadscrew. As the motor rotates the screw, the nut translates the rotary motion into linear motion as it moves along the shaft of the leadscrew.
This video demonstrates how a Threaded Linear Actuator motor runs. This is a normal step motor with a long threaded shaft. This type of stepper motor is typically used with a threaded nut that travels up and down the shaft.
This video shows how a Non Captive Linear Actuator moves. Both the shaft and the body needs to be secured for proper operation. When the shaft or motor body is not secured, it will spin freely. For this example, the shaft and motor body is secured (due to its weight and placement of wires), resulting it to move up and down the shaft.