Buerste wrote:

machine jams and the torque limiting device kicks out. How can I cheaply,
easily sense this condition and turn off the motor?


Are you going to make your torque limiter? If so, make one that's noisy
when operating. I had an industrial sewing maching with a safety clutch
in the form of a spring-loaded ball in the driven member, engaging with
a detent hole in the driven half of a coupling. It made a nice racket
when the machine jammed.

Jordan