Re: [TCML] I think I ruined my 6" secondary.

[Yurtle Turtle <yurtle_t@xxxxxxxxx>]

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 50.

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.

Adam

--- On Mon, 7/7/08, bunnykiller <bunnikillr@xxxxxxx> wrote:

> From: bunnykiller <bunnikillr@xxxxxxx>
> Subject: Re: [TCML] I think I ruined my 6" secondary.
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> 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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