its a brake band and clutch plate riveting machine. Guess you already knew that huh? I believe the punch is to do the rivets and the grinding wheel is to arc the brake linings to the drums. But don't hold me to that.
Haha ya I figured it was for rebuilding brake shoes etc. It has a small drill bit at the one station for taking out the old rivets I'm assuming. I don't have the hardware for the rivet punch and I'm not sure what size motor it would take. I can't find a pic of one of these anywhere.