Cable Reels can be used as a linear position sensor in any industrial application to monitor a linear or reciprocating machine motion. The system consists of a heavy duty spring motor assembly attached to a precision machined cable drum. As the cable is pulled off of the drum, the drum rotates a rotary position sensor. This approach to machine positioning has several advantages over traditional limit switches. In hostile environments, such as many steel mill applications, the cable reel sensor can be mounted remotely. This protects the sensor from excessive heat, steam, water, chemicals and physical damage.