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Re: Cigar secondary coil form (fwd)
---------- Forwarded message ----------
Date: Wed, 29 Apr 1998 12:21:30 -0700
From: Jim Lux <jimlux-at-earthlink-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Cigar secondary coil form (fwd)
>
> ---------- Forwarded message ----------
> Date: Wed, 29 Apr 1998 03:11:11 +0500
> From: "Alfred A. Skrocki" <alfred.skrocki-at-cybernetworking-dot-com>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Re: Cigar secondary coil form (fwd)
>
> On Tue, 28 Apr 1998 21:17:25 -0500 RODERICK MAXWELL
> <tank-at-magnolia-dot-net> wrote;
>
> > I have been looking far and wide for a polystyrene coil form larger
> > than 4" in diameter but I never found one. So I decided to make one of
> > my own!...
>
> Making your own tube for a secondary form is a very viable option. I have
> made large diameter plexiglass tubes like 2 feet in diameter by heating a
> 1/4 inch thick sheet and then bending it into tube shape and then joining
> the seam with methylene chloride. It's sure a lot cheaper buying the
sheet
> than an already formed tube! It's a shame it can't practicaly be done
with
> very low loss material like polyethylene or teflon, but damn near nothing
> will work as an adhesive for these!
You can "weld" polyethylene pretty easily if you have the requisite plastic
welding "torch" (it's basically a cartridge heater and an air supply, and
blows hot air out the tip). You can also epoxy polyethylene if it is
properly oxidized first (with chromic acid, I believe). And, you can epoxy
polyethylene by pretreating it with a sparker, which creates little tiny
holes in it that the epoxy can bond into, providing a mechanical
connection, if not an adhesive one.
You should be able to weld/fuse teflon the same way, although I am not sure
about whether you would have to do this in an inert atmosphere or something
more exotic.
Why not just use the windings themselves to hold the sheet of whatever in
place? You'll do your winding under a few pounds tension, which with a
typical 500 or so turns gives you 1000 pounds plus force holding the gap
together....