I should have done that Alex, it ended up being a bit troublesome, and
I did melt the PVC some. I'm happy to report though, the coil is back up
an running beautifully! No corona or anything. I'm going to put a few
more coats of polyurethane on once the epoxy on the repair is fully cured,
but I got no corona from it, which is a plus... Thanks for your help guys!
Scott Bogard.
On Thu, Sep 18, 2014 at 1:01 PM, Alex Yuan <alexhanyuan@xxxxxxxxx> wrote:
> 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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> >
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