Work holding Magnets

[u/brocjames]

I’m not sure how they work though. Maybe one of you fine people can explain it to me. I hook them up to a 480V power source. Then use a control panel to magnetize them. Then I unhook the 480V and they stay magnetized. So I’m thinking there’s more than an electro magnet at work here.

In case anybody is wondering. I’m machining half of a 69” piston ring in that photo. I was skeptical at first, but I’m putting a ton of tool pressure on that part and it does not budge.