I removed the burnt wires and sanded/scraped off the black PVC. I'd
recommend putting a small piece of aluminum foil or something that doesn't
melt between the wire and PVC when you solder it so you don't burn the PVC,
and just take it out when you finished.
On Thu, Sep 18, 2014 at 10:34 AM, Carl <cn8@xxxxxxx> wrote:
> 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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