RE: Flat Spiral Winding Techniques

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

Original poster: "David Thomson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dave-at-volantis-dot-org>

Hi Robert,

I'm using both, polyurethane and resin.  (The fiberglass resin is referred
to as a polymer coating by some manufacturers.)  The advantage I have found
with using polyurethane first is that it is more liquid and can get
underneath the windings.  And because it gets under the wires, it is very
important to allow plenty of time for curing.  I wound a coil with just
polyurethane between a Plexiglas plate and a piece of polyurethaned plywood.
Three months later I cracked the coil apart to see if the polyurethane had
set, but it ran out just as liquid as the day it was applied.

After the coil is sealed with the polyurethane, I use the polymer coating
and just as you say, it's set and ready to use the next day.  I haven't
found another product that compares to the efficiency of the polymer coating
when it comes to sealing in corona.  I've just ordered another gallon from a
supplier I found last night on the Internet.  They not only sell polymer
coating but also all kinds of acrylic shapes, tubes, angle pieces, and other
related supplies at reasonable prices.  I've also ordered a can of acrylic
cement.  If it works well, I'll build an acrylic tank for the primary and
secondary circuits and fill it with oil.  The web site is
http://www.tapplastics-dot-com/.

Right now I'm getting so much pressure in my coils that they are shooting
out jets of electricity all over the place.  I'd share the information on
this list, but it would end up going off topic again.  Suffice it to say, I
have verified Tesla's statements on why his coils worked different from
Hertzian coils.  As soon as yahoo is working again, I'll post on the
spiralcoils list.

Dave

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, March 17, 2002 11:24 AM
To: tesla-at-pupman-dot-com
Subject: Re: Flat Spiral Winding Techniques


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

Dave: I use fiber glass resin to coat all my coils. I can have a coil ready
for use the next day.I suggest this on the net and get no responce.You are
using urethane and take days. Can you tell me what advantage your coating
has ? I would like some feedback. I may never change, but I would like to
hear some responce. Thanks
  Robert  H

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Sat, 16 Mar 2002 19:47:16 -0700
> To: tesla-at-pupman-dot-com
> Subject: Flat Spiral Winding Techniques
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Sat, 16 Mar 2002 20:15:36 -0700
>
> 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
>
>
>