Re: Primary

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-uswest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Greg,

I agree 100% that wood should not be used as an insulator. That's why I use
the single hole / tywrap
method to attaching primary windings to a wood primary form. A single 1/4"
hole is drilled through the
runners allowing a tywrap to be inserted from the bottom runner up through
the hole - then around the
primary winding - and back down the same hole locking on the bottom of the
runner. I tried this a few
years ago after using a dual hole drill method that bites! The key here is
the tywrap actually acts as a
standoff - but you can't make the hole in the runner too big or the primary
winding will actually contact
the runner. A couple test drills will help the builder find the right drill
size in his/her arsonal.

Take care,
Bart

Tesla list wrote:

> Original poster: "Gregory Hunter by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <ghunter31014-at-yahoo-dot-com>
>
> Others have gotten good results with the primary
> conductor directly in contact with wood or particle
> board, but I'm not comfortable with the idea.  Wood
> products are OK for a primary deck foundation, but not
> for insulation.  Use plastic, glass, or ceramic stand
> offs of some sort so the copper tube isn't in contact
> with wood.  I used PVC pipe insulators.  It was cheap
> and effective.  Have a look at the world's simplest,
> cheapest spiral primaries at:
>
> www.angelfire-dot-com/ga3/tesla
>
> Cheers,
>
> Greg
>
> --- Tesla list <tesla-at-pupman-dot-com> wrote:
> > Original poster: "by way of Terry Fritz
> > <twftesla-at-uswest-dot-net>" <Leik3-at-aol-dot-com>
> >
> > Hi everyone!
> > I'm about to start on my primary and wanted to run
> > some numbers past you all.
> > First I have a 15/30 and I'm going to use 1/4 inch
> > copper tubing (refrige)
> > spaced at about quarter inch. Oh yeah, 2 1/2 inches
> > between the secondary and
> > first turn of primary. Does this sound reasonable??
> > Is the turn spacing too
> > close? I read somewhere that You could use that
> > perforated particle board,
> > but it seems to me that it would arc along the board
> > (it happened with
> > regular wood).
> > Any suggestions?
> > Thanks,
> > Dennis
> >
> >
> >
>
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