[TCML] I think I ruined my 6" secondary.
pslawinski at gmail.com
Tue Jul 8 08:48:06 MDT 2008
If you use the stuff I recommend from Home Depot impact does not see to be a
problem. I've dropped the coil a few times and it has not show any signs of
cracking. The stuff does not seem brittle at all. It also gave the coil a
very nice appearance aside from the bubbles, which I could have removed had
I known to go over the thing with a hair dryer.
On Tue, Jul 8, 2008 at 8:45 AM, Yurtle Turtle <yurtle_t at yahoo.com> wrote:
> Thanks. Lotsa good info here. .300" thick cardboard sounds like it ought to
> be pretty rigid, compared to SonoTube. I tried browsing Behr's website, to
> see if this is an epoxy, but couldn't find it. I assume you used Behr Build
> Like I mentioned, I usually use spar varnish, but this will sometimes
> yellow with age. I wanted to use epoxy on my next coil, but may have to
> reconsider. Although, as long as I don't bang mine, it may be OK.
> --- On Mon, 7/7/08, bunnykiller <bunnikillr at cox.net> wrote:
> > From: bunnykiller <bunnikillr at cox.net>
> > Subject: Re: [TCML] I think I ruined my 6" secondary.
> > To: "Tesla Coil Mailing List" <tesla at pupman.com>
> > Date: Monday, July 7, 2008, 5:29 PM
> > Hey Adam...
> > a bit more detail on my coil...
> > the secondary form is a 12.25 OD X .300" wall
> > thickness shipping tube
> > approx 60" O.A.L.
> > I sanded the outer and inner surface areas and
> > "primed" with Behr 50.
> > I used my lathe to apply an 18ga. double Formvar magnet
> > wire. I also
> > added 10" of #10 THHN solid copper at the bottom of
> > the coil for current
> > reasons.
> > Next I applied 2 coats of Behr 50 in 48 hrs with the
> > secondary still on
> > the lathe at 5 rpm ( let the 1st coat dry for 24 hrs)
> > applied 2nd coat
> > next day and let dry for 24 more hrs.
> > removed secondary from lathe and recoated inner form with
> > Behr 50, put
> > back on lathe for 24 hrs.
> > From what I remember, the "elasticity" of the
> > coating remained for
> > about 3-4 yrs. Eventually it became "stiffer"
> > over the next couple of
> > years, but still quite durable against scratching. In the
> > last 2 yrs or
> > so it has evolved into a semiflexible coating ( not
> > brittle) but the
> > wire under the coating seems to have an easier time
> > releasing itself
> > from the Behr 50 when subjected to impacts ( generally
> > falling over and
> > hitting something). The spots of wire release seem to
> > average about 2"
> > in dia. at impact point.
> > I have run the coil at full power from my 30KV polepiggie
> > at 65A (
> > 280VAC into pig @ 65A) and have no problem with arcing in
> > the seperated
> > areas ( must be the double formvar coating :) )
> > As far as storage... it resides in my workshop... no A/C
> > just the
> > temps that nature provides ( 20 - 105 F and 1 nasty
> > hurricaine) since
> > 2000 AD :)
> > Scot D
> > >
> > >
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> > Tesla at www.pupman.com
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