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Wow, that sounds easy. We all have fan motors lying around that have stiff bearings. Pull one out of the scrap pile.The stator from an electric motor makes a good demag. Hook 2 leads up to 120v. Pass bar stock through. You must also move bar stock several inches away before unplugging/turning off demag. Set up stock guides as necessary for your task.
You can do the same thing with a coil of welding leads, welder set to AC, welder on, and leads shorted.
I tried that once using the outer windings of a 120v universal motor. The motor windings started smoking within about 10 seconds after plugging it in. The windings could not handle the current without the armature. Didn't work for shit. I ended up buying a real demag off PM and it's been working fine.The stator from an electric motor makes a good demag. Hook 2 leads up to 120v. Pass bar stock through. You must also move bar stock several inches away before unplugging/turning off demag. Set up stock guides as necessary for your task.
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