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Re: [TCML] Emergency Secondary repair, also archives down???



Hey--

I had to repair a 12" dia secondary with a similar problem, and another with a 2 inch cut across the turns. In each case I took off all damaged turns, then drilled a small hole in the open area. I cut each adjacent turn to about 2" longer than the length to reach the hole, stripped the wire back about 1 1/2 inches and stuck both ends into the hole. Then I reached inside the secondary and twisted the wires until they were tight on the outside. That leaves a wire reaching diagonally across the damaged area. You can fold over the twisted ends, but the interior of the coil has only a longitudinal E-field, so it should not corona. The repairs both worked, but the 2" wide one had corona from the diagonal wire and was the source of a few sliding sparks on the coil. I built a nice container for the coil out of a cardboard concrete form tube.

In each case, we were able to rewind each section using the same joint technique at each end.

Good luck!

---Carl





-----Original Message----- From: Scott Bogard
Sent: Wednesday, September 17, 2014 8:38 PM
To: Tesla Coil Mailing List
Subject: [TCML] Emergency Secondary repair, also archives down???

Hey all.
    So I finally burnt up my first secondary coil, (hopefully my last
also) and I was going to show it off on Saturday (not a paid gig, but still
I'd rather not disappoint).  I was going to look up the accepted procedure
on repairing them in the archives like a good boy, but they didn't work on
my machine, I got a 404 error...  Well the error occurred when I tried to
"search the site including archives".  Anyway, is there any last second
pointers for the uninitiated?  The coil is a 4*18 wound with 28 AWG, is
there any chance of saving her?  The turn got hot and smoked a bit, before
glowing red, it is pretty bad, but the damage seems confined to about 3
turns or so, about 2/3rds up the side, it suffered a fall at some point and
despite re-coating it with polyurethane, well you know the story.

Scott Bogard.
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