I built my mill out of a tumble dryer.I wonder if something like that is available for small electric motors.
Well, after searching and digging there is such a sensor but finding a vendor who will sell one in small quantities is a problem.
I'll have to contact one of the manufacturers to see what sort of a "deal" they'd be wiling to make for a small number of them...
There are three temperature sensors in there, and a broken dryer can be picked up for free.