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Re: Big Toroids, collective conscious brain storm

Original poster: "Mark Broker" <mbroker@xxxxxxxxxxxxxxxx>
I first wrapped fiberglass drywall joint tape over a 4x18" toroid, then covered it with a super-lightweight vinyl spakling compound. The stuff went on easily, stuck well due to the mesh tape, sanding was "very" easy, and was not "fragile" once taped. When smooth, I covered it with a layer of Aluminum duct tape and burnished it with an oiled spoon (wifey was not pleased :p ). It's pretty rigid, though it does dent alarmingly easy (fingernails, for instance).
I know others who have made 6" toroids in this fashion - Steve Ward, I think, being one. I'm not sure I'd want to try it with anything larger, though - it may "feel" stiff, but the dent resistance is questionable.
On a whim, I once poured some epoxy into a drierduct toroid and set it spinning at low speed on a lathe. The epoxy never really coated well, but it "really" helped stiffen it up, even in the thin spots. That must have been circa October, 2003, and I did post here about it. 

Cheers,

Mark Broker


On Wed, 13 Sep 2006 21:42:40 -0500, Tesla list <tesla@xxxxxxxxxx> wrote:


Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

Hi,

Suppose a drywall toroid (simple sanding, yet fragile at this stage) was
made than coated with epoxy (sprayed)?. This would greatly increase the
strength and keep it very smooth. Perhaps Dr Resonance's paint will do the
trick? Otherwise the challenge is to coat plastic or something like that and
use it as a grounded target to discover the best enduring coating. D.C., can
you use your paint as a target?

Jim Mora

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Wednesday, September 13, 2006 5:12 AM
To: tesla@xxxxxxxxxx
Subject: RE: Big Toroids, collective conscious brain storm

Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>

Years ago, I built a drier duct toroid, and covered it
with drywall mud. I got it real smooth, then painted
it with a metallic paint. I don't remmeber which kind
of paint I used, but it ended up looking more like a
crackle tube than a tesla coil. The arcs never really
left the toroid, but rather ate away the paint, much
the way a CD on a tesla coil does. It was really cool,
but may not be what you're after. Has anyone tried
using metallic paint on a topload?

Adam

--- Tesla list <tesla@xxxxxxxxxx> wrote:

  > Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>
  >
  > Terry,
  >
  > You did quite a lot of electrostatic modeling. How
  > important is the actual
  > complete toroid considering the inside is a flat
  > plane generally?
  >
  > I just got of the phone with a boat fiberglass
  > repair expert. Suppose we
  > were to make a large alum duct toriod as usual on a
  > large flat surface, and
  > wrap it in fiberglass or yet to be discussed fabric.
  > They have epoxy spray
  > guns and could gel coat them for real smoothness and
  > keep it thin enough to
  > be unnecessarily too heavy.
  >
  > I liked the idea of nickel paint they use on cheaper
  > plastic PC covers for
  > RF shielding. Hey it Passes class B or C FCC, should
  > work great. Anybody got
  > a cover or some of this paint to use as a target for
  > testing?
  >
  > Jim Mora
  >