OK guys I bought this old 50's dumore tom thumb tool post grinder. Put it on my lathe and plugged it in and it propped a breaker. I reset the breaker took it off the lathe, plugged it in and it ran just fine. Every time I put it on the lathe and plug it in it blows the breaker. As long as I plug it in and don;t touch metal it runs just fine.........but if I touch it to metal it blows the breaker. Anyone have a solution or know what is wrong.