video METAL MELTER!
Here's a microwave oven transformer that's been modified into a dangerous little device. Now it can pump out 800 amps of electrical current, so let's use it to melt some metal!
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I saw this project, and remembered I had a MOT somewhere. I found it the other day, and I decided to modify it. The only tools I had to work with were a 10 year old hacksaw with a dulled blade, and a hammer. 6 hours of intermittent hacksawing and bashing later, and the weld was finally broken! I tapped the primary out with ease, but the secondary was a different story. I sawed and bashed and did everything I could with my tools to it. No luck whatsoever with getting that out. All I managed to do was wedge it in a bit better. I decided to make a trip to the hardware store, and pick up some cable and some tools. I got a chisel, a new blade, and a rubber mallet. That still wasn't enough to bash out the secondary though. I even tried drilling it out a bit, but that was useless. So I decided to bake it at 250 for about an hour, When it came out, I slowly chiseled and hammered and pried away at the secondary, until finally it was all gone. I now wish I had taken a picture of the huge pile of copper strands all over my workbench. From there, it was an extremely easy build. I cable-tied the transformer back together once I was done, and I was ready. At that point it was about midnight, so I figured I would have to wait until the morning. Morning's soon, so I'll let you know if it works or not once I test it! Wow, I've just written a bit of a novel here.
tl;dr: It is extremely difficult to build one of these without the proper tools. Buy the right tools, and bake the MOT in an oven for a bit if the secondary is stuck.
As an electrician, 30 plus years, I would be interested what the modifications are to the microwave to have the 3 volt out put and high amperage.
Care to share?
Aquaponic Glenn at www.olomanagardens.com
that's hot but may i know what's the guage and turns of the primary coils of the transformer and what's the approximate cost of that???? cause i need to build it!
Regards,
Samad Haque.
I'm currently working on a video on how to build this. It cost me about $4 for the wire and lugs because I got some scraps from my brother. The MOT was free out of a microwave.
The video should be done in a couple of weeks. I used 2 AWG insulated stranded copper wire.
Thanks!
I made a 1 MOT stick welder, but you can imagine it was barely enough power to burn a 1/16th rod.
Why did you use 4 MOT's? I've heard 2 is common .. but 4? :) Please tell!!
Thanks for your compliments!