Detecting an unsecured state of a mandrel

A mandrel position analyzer in an imaging device comprising:

• a head stock for a first side of the mandrel;
• a tail stock for a second side of the mandrel;
• a first encoder attached to the head stock adapted to measure first signals wherein the first signals are generated by movement of the mandrel to form a first set of results, wherein the first set of results represents a rotational speed of the mandrel;
• a second encoder attached to the tail stock adapted to measure second signals wherein the second signals are generated by movement of the mandrel to form a second set of results, wherein the second set of results represents the rotational speed of the mandrel;
• an analyzer which compares the first set of results to the second set of results;
• and
• an alarm;
• wherein if the first set of results is different from the second set of results, the alarm alerts an operator.