RE: Flat Spiral Winding Techniques

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jim-at-jlproduction-dot-com>

Just one thing that you probably already know.
WATCH OUT FOR ANY HEAT SOURCE!!!
I inadvertently laid mine against the wall in my room and the forced hot
air
duct was about 1 ft away. In just a few seconds my perfect secondary had
nasty heat blisters that made the whole thing look crappy. It took
several more coats of clear to hide the bad spots and it never looked as
perfect again.
Jim L

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com] 
Sent: Saturday, March 16, 2002 11:30 PM
To: tesla-at-pupman-dot-com
Subject: Re: Flat Spiral Winding Techniques

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

Hi Dave -

I got back to my flat coil tonight as well. As you know I used carpet
tape
which worked fine for
holding the wire down during winding. I put a plexisheet on top and it's
been there ever since.
Tonight, I removed the top plexisheet for coating.

Someone posted using superglue to hold the windings down. Seemed like
the
right idea so I applied
small super glue runners in several areas (more runners on the outer
compared to the inner
winding). It dried just fine but the fumes (ouch! needs major
ventilation)
(used standard old
superglue, nothing special).

Anyway, after it dried I applied spar varnish to different sections of
the
winding (not all at
once). It's been drying for about 1/2 an hour now and none of the
windings
are coming up. yeah!!
This method is working for me. Kudo's the person who mentioned superglue
runners!

When this varnish coat dries, I can liberally apply it over the entire
coil
without worry. Just
took another look and it's flat as pancake.

Take care,
Bart

Tesla list wrote:

> Original poster: "David Thomson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <dave-at-volantis-dot-org>
>
> I tried winding a flat spiral coil between two sheets of 1/4"
Plexiglas
> yesterday.  The coil wound perfectly.  However, when I tried to heat
the
> Plexiglas, the copper wire expanded within the Plexiglas sandwich and
the
wires
> made a mess.  Scratch the melted Plexiglas idea.
>
> I'm now making a jig to expedite winding a coil and covering it with
> polyurethane and polymer coating.  I'll let you know how this goes.
So
far the
> best method I have found is to spray the surface being wound with
spray
> adhesive (the stuff sold at auto stores for repairing headliners) and
allow the
> coating to dry for two days before winding by pressing the wire on.
After
> winding, I keep the wires held down with bricks and polyurethane a
small
> segment at a time, ever other day or so.  The polymer coating on top
of the
> polyurethane makes an excellent dielectric sealer for the coil.
>
> Dave





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