I'm currently doing an experiment on an AC motor to measure the torque output from a servo drive using fishing line wrapped around the servo shaft / gear while the other end is connected to a luggage scale.
The shaft is connected to a gear of 1/2'' radius. The fishing line is wrapped around the gear and the other end of the line is attached to a luggage scale. The motor is rated for 11 lb-in of continuous torque, corresponding to 22 lb-force for half-inch radius gear. However, I am not able measuring nearly that amount even at the maximum torque input current. My scale barely budges past 2lbs even at maximum torque (by applying the largest control input value). Any clues as to what I'm doing wrong? Thanks!
FYI I'm using an Applied Motion products Servo Drive model J0400-305.