Re: Flat Spiral Winding Techniques

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

Original poster: "Brian by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ka1bbg-at-webryders-dot-net>

ok, sure looks like a challanging project. I used to do R+D work in
electronic/mechanical designs. Challange brings much learning to the mind.
i can see the bubbles problem. My brother does decopage and getting the
bubbles out is a real big problem. cul brian f.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, March 19, 2002 10:58 PM
Subject: RE: Flat Spiral Winding Techniques


> Original poster: "David Thomson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <dave-at-volantis-dot-org>
>
> Hi Brian,
>
> >What about using a very slow cure epoxy and putting it on while your
> winding and then leave it clamped for a couple days. cul brian f.
>
> I've tried this.  A coil can be made in this manner, but it becomes full
of
> bubbles as the winding progresses.  This is due to the wire continually
> churning the epoxy as the winding progresses.  The center will be
relatively
> bubble free, but the outer windings will be encased in a milk white air
and
> epoxy mixture.  I have several coils with this condition.  I won't operate
> any of the coils under high power because I'm concerned the air bubbles
near
> the wire will explode if rapidly heated.
>
> Also, over time the mixture begins to thicken up.  Inevitably there are
> places where the epoxy is thicker than others.  This creates more drag in
> some places and less in others.  The result is an oblong coil.  I have
> several of those, too.
>
> Dave
>
>
>
>