Re: Toroid ? Bendaway_Plus, stainless, titanium stabilized

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Scott Hanson" <huil888@xxxxxxxxxxxx>

John -

Why, specifically, would the type of metal the toroid is constructed 
of have any bearing on functionality or performance?

At the voltages and currents present at the top of a Tesla coil, the 
actual material the topload is constructed from really doesn't 
matter, as long as it is reasonably conductive and appropriately dimensioned.

That's why a chicken-wire toroid can provide the same level of 
"performance" that a dimensionally-identical spun copper toroid 
could, all other factors remaining equal. Greg Leyh's Electrum and 
his "40kW Experimental coil"  both use toploads constructed from 
multiple hoops of metal tubing (see www.lod.org for construction 
details). Electrum's topload is a 7' diameter sphere fabricated from 
type 304 stainless-steel tubing , while the 40kW coil uses 2" 
diameter aluminum tubing to form the hoops for the 108" diameter 
torus. Neither of these materials would be good choices for use in a 
TC primary circuit (with high peak current at high frequency), but 
both can work perfectly in a topload.

I've even used 18" diameter acrylic spheres sprayed with special 
nickel-based conductive paint for a topload, and they worked just 
fine. Spun aluminum, spun copper, aluminum foil tape over any type of 
substrate, steel chicken wire over plywood or styrofoam forms, steel 
or aluminum hoops, conductive paint, copper plating, etc, etc will 
all give very similar performance if properly matched to the coil and 
utilize good workmanship to control minumum radius of curvature.

Regards,
Scott Hanson


----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, September 04, 2006 2:26 PM
Subject: RE: Toriod ? Bendaway_Plus, stainless, titanium stabilized


> Original poster: "" <tesla@xxxxxxxxxxxxxx>
>
> I can't help but address the issue of steel for a toroid.  You want aluminum,
> copper or perhaps brass.  I've made exceptional toroids from 6' lengths of al
> ducting from Home Depot with a 1/8" al circular piece in the middle attached
> with al tape - cost was under $75.00 and that device has kept intact 
> for over 5
> years.  The best, of course, is a smooth toroid from, oh, say, O.W. Landergren
> who has been making toroids since 1927 and have that process down to a rote
> procedure.
>
> Cheers,
>
> John Cooper
> www.Tesla-Coil.com
> www.Tesla-Coil.org
> www.FrankensteinsLab.com
>
>
>
>
>
>
>
> Quoting Tesla list <tesla@xxxxxxxxxx>:
>
> > Original poster: "Rich & DJ" <rdj@xxxxxxxxxxxx>
> >
> > If you want to use 12" dia the smallest circle you can form with it is
> > 86" on the outside, 37" bend radius, weight 1.83 per ft, cost about $800
> > a section then there is shipping. It is great, we used it in duct work
> > for our clean room and vents for diffusion pumps because of the
> > hydrofluoric acid fumes.
> > Rich from the middle of Missouri
> >
> > -----Original Message-----
> > From: Tesla list [mailto:tesla@xxxxxxxxxx]
> > Sent: Monday, September 04, 2006 12:40 AM
> > To: tesla@xxxxxxxxxx
> > Subject: Toriod ? Bendaway_Plus, stainless, titanium stabilized
> >
> > Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>
> >
> > Hi,
> >
> > Has oneone looked into this product before? It claims resilance and
> > looks it
> > to have it in spades. No bends or dent likely on this excepting extended
> > drop tests maybe.
> >
> > It looks to be somewhat smooth too. Coat with alum tape?
> >
> > I'm wanting to build a 54"x12" toriod. Maybe we can get a sample piece?
> > I
> > wonder what the wieght is per foot?
> >
> > Jim Mora
> >
> > The message is ready to be sent with the following file or link
> > attachments:
> >
> > Shortcut to: http://www.ducting.com/Bendaway_Plus.html
> >
> >