Re: drying coil forms

To: tesla-at-pupman-dot-com
Subject: Re: drying coil forms
From: Bert Hickman <bert.hickman-at-aquila-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Mon, 10 Jan 2000 07:10:16 -0700
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Tesla List wrote:
> 
> Original Poster: Justin Gould <justing.mrl-at-dubbo.nsw.gov.au>
> 
> This is just a thought, but would it be possible to make a formless
secondary?
> I would envisage the process going something like this:
> 
>         1. Wind coil on carboard tube of appropriate dimensions
>         2. Epoxy/Varnish with lots of coats (enough to hold shape)
>         3. Soak coil in water (or whatever) to disolve cardboard form.
>         4. Sand & coat inside for extra support for wire.
> 
> Any thought?
> 
> Justin G.
> 
<SNIP>

Justin,

This approach should work quite well. Greg Leyh fabricated the secondary
of his giant coil, Electrum, using a similar technique, using fiberglas
resin to hold the #12 AWG winding in place, then using high pressure
water to remove the original interior cardboard form. 

http://www.lod-dot-org/electrum/electrumpics.html

Safe coilin' to you!

-- Bert --