Re: Copper Banding?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "david baehr" <dfb25@xxxxxxxxxxx>


In a previouse post, it was stated that a banded pri. would have less 
inductance than a copper tubing pri. Could someone explain this ? IF YA got 
50' of copper tubing , and 50' of banded pri. , wouldnt be about the same 
????????////

>From: "Tesla list" <tesla@xxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: Re: Copper Banding?
>Date: Sun, 27 Feb 2005 11:00:28 -0700
>
>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
> > >
> >
> >
> >
>
>