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I have just finished my third MOT rewind but the last two I decided to try to save the secondary because it is a grate source of copper wire for anything from lits wire to small (not to small) tc secondarys the only problem is removing them without damaging them or the core is a pain in the A!!!!!S so dose anyone now a better wsy. ?
Also dose anyone now of anything that can be used as a quick and easy secondary former rather then carving one out of a price of wood.?
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
To take the MOT core apart, there is really only using a angle grinder to cut the welds open on the sides. This should leave the core relatively unharmed.
The wire from the secondary is a rather large gauge compared to the length wound on a MOT, it is really not suitable to use for a Tesla coil secondary unless you aim for MHz resonance. The varnish on the wire is also some hard splintering not very nice stuff to work with.
If you want to source cheap wire for secondary coils, look for small motors, solenoids or larger industrial relays, the solenoids in these will contain nicely would up on a roll copper wire ready to roll off its form.
Sewage pipe is always a hit, made from hard PVC and if you are lucky you can find scrap pieces near road work. Do not use wood as secondary form as carbon tracks will quickly evolve from the slightest flash over between windings and will render your secondary useless.
Sorry I wasn't very clear on that the question is what is the easiest way to remove the secondary from an MOT without damaging it spicificly overcining the problem with the glue (dam glue) the tc was just an example of one of the hundreds of things you could do with the wire And the former is to wind a new MOT secondary on before transferring it to the MOT core
Registered Member #187
Joined: Thu Feb 16 2006, 02:54PM
Location: Central Ohio
Posts: 140
When I was building my VTTC I ran into a similar problem. I wanted to use a MOT to power it but I was afraid the MOT secondary voltage would blow the 811A vacuum tubes, I wanted to run it in full-rectified mode which would have put around 1600 volts through the tubes, which probably would have blown them.
I ended up setting the MOT on a hotplate on a low setting for an hour, and kept nudging the heat up until the varnish softened. At that point the sec wire was easy to peel out of it. I was careful to go turn by turn so I would not damage the remaining windings. It took about two hours or less. It worked wonderfully.
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How do you remove your MOT seconderys without damaging them
