I picked up a table saw(very large cast iron top) 5 hp single ph motor, has
a magnetic switch on it . It will run only when you hold in the start
button, shuts down as soon as you let go, tough to use that way... I
cleaned out the switch and box, checked for loose wires, found no arced or
burnt contacts , no difference. I have my trusty multi-meter and am ready
to troubleshoot as soon as one of the RCM electrical guru's rains a bit of
knowledge on me. What do I do next?

I don't know about saws specifically but usually if there is a magnetic
switch it is so that a break in the magnetic hold circuit will stop it for
safety purposes. Any open in the safety circuit will stop it. That would
include a stop switch, a safety switch that opens if the guard is removed
from the blade, a cover is open that shouldn't be such as one over the
belts, etc. I'd look for something like that.

Best Regards,
Keith Marshall


"I'm not grown up enough to be so old!"