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Re: Copper Banding?

Original poster: "Terry Blake" <tb3@xxxxxxx>

Hi Karl,

The spacing material is  0.25" thick x 0.75" wide polyethylene foam strip
(sticky on 1 side).  I have had hits to the primary, but the foam is
recessed by 1/4", so it is not really exposed to the high voltage.   I do
have some burn spots caused by the clamp I use to tap onto the primary, but
they have not been a problem.

If I needed to repair an area, I could easily lift out a small segment of
the primary (foam is sticky on 1 side only), cut away the burnt foam with a
razor blade, and then replace with a new foam piece (if needed).  It would
take maybe 5 minutes.  There would be no need to redo the whole thing.

Cheers,

Terry Blake
Coiling in Chicago.
http://www.tb3.com/tesla/index.html


----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, February 25, 2005 1:43 PM
Subject: Re: Copper Banding?


> Original poster: Karl Lindheimer <karl@xxxxxxxxxxxxxxx>
>
> Hi Terry B.,
>
> I found you photos interesting, and you have given me an incentive to
> perhaps one day wind a "banded" primary.  One thing though.  You spaced
the
> flat bands apart using sticky tape, or foam weatherstripping?  Did you
ever
> have any problems with flashover between bands?  I would imagine that if
> the foam ever became carbonized due to a streamer hit, or inter-turn
arcing
> that your primary would be ruined, and need to be re-wound.   How has it
> held up so far?
>
> Curious,
>
> Karl
>
> On Feb 24, 2005, at 9:39 AM, Tesla list wrote:
>
> >Original poster: "Terry Blake" <tb3@xxxxxxx>
> >
> >Hi Tyler,
> >
> >I'm not sure about copper banding, but I have used a spring-bronze
> >weatherstrip and a 0.25" thick polyethylene foam strip (sticky on 1 side)
to
> >make a few primaries.  The spring-bronze weatherstrip is 1.25" wide and
> >about 0.01" thick.  It is the same stuff used to seal around doors.  I
like
> >it better than copper, because it does not kink, and is very springy.
> >
> >Here is a link to my HUGE Tesla coil that used such a primary for up to
> >7.5KVA.  It put out 9 foot streamers.
> >http://www.tb3.com/tesla/hugecoil/primary/primary.html
> >
> >Here is a link to a smaller primary and shows how I was able to construct
it
> >by myself in 30 minutes.
> >http://www.tb3.com/tesla/oil/mini/primary.html
> >
> ><<SNIP>>
>
> >Enjoy.
> >
> >Terry Blake
> >Coiling in Chicago.
> >http://www.tb3.com/tesla/index.html
> >
>
>
>