Grither: They have crazy pencil sharpeners in Russia.
jfarkinB: Way, way back, I found a book full of radio-frequency heating projects. It had projects for building an induction heater like this one, and a plasma torch as well. Difficulty: everything ran on big honking tubes, fed from big honking transformers, and I was an all-solid-state kinda guy.I'm sure they could redo the book with today's big honking MOSFETs, but I'm not up to designing it myself. I'm also not really up for homebrew projects that can reach across several inches to deal sudden, smelly, charred death.I did see a demo of this once in high school, and it was indeed way cool. The little copper-tubing coil wasn't very impressive, but the four-foot-on-a-side metal cabinet it stuck out of was.
jfarkinB: Well, it's a bit of a stretch to call microwaving "inductive heating", but okay -- if that was really transferring energy directly to the melt metal, I guess it counts. Real inductive heaters run at much lower frequencies, though, I think.
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