64c6130d_roubleshooting_Common_Problems__Symptom
[Solution] Check to see if you turned off your machine on high speed. If so, unplug your machine and install the sanding disc. Rotate the disc counter-clockwise by hand while turning the speed dial to slow [Symptom] 
Circuit breaker blows when you turn machine on
Shopsmith Mark V -- Troubleshooting Common Problems
Symptom