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Re: Toroid ? Bendaway_Plus, stainless, titanium stabilized



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
>
>