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RE: Large Foam Toroids

Original poster: "Lau, Gary" <gary.lau@xxxxxx>

The foam toroid must still be covered with strips of aluminum tape.  See
the link below for details and photos.  When dealing with toroids of the
size being discussed, the cost of a spun aluminum toroid becomes
prohibitive.  Unless you're willing to accept the coarse corrugations of
irrigation duct, or the fragility (and corrugations) of aluminum flex
duct, the tape-covered foam toroid is the only (relatively) economical
means of getting a smooth, sturdy, large toroid that I'm aware of.
Having gone this route, I recommend it.

Regards, Gary Lau
MA, USA

> Original poster: "Cameron B. Prince" <cplists@xxxxxxxxxx>
>
> The idea and information regarding the use of foam toroids for Tesla
coils
> originated here:
>
> http://users.rcn.com/laushaus/tesla/foamtoroid.htm
>
> > -----Original Message-----
> > From: Tesla list [mailto:tesla@xxxxxxxxxx]
> > Sent: Sunday, July 10, 2005 12:17 PM
> > To: tesla@xxxxxxxxxx
> > Subject: Re: Large Foam Toroids
> >
> > Original poster: "marc" <xp88@xxxxxxxxxxxxx>
> >
> > I purchased an O. W. Landergren toroid several months ago.
> > They are NOT inexpensive!
> > But.. it is a sturdy, spun AU toroid. You will have to drill
> > your own center hole..
> >
> > How do you modify a foam toroid? copper/aluminum tape??
> > Metallic spray paint??
> >
> > How do you mount it?
> >
> > Marc
> >
> >
> > > [Original Message]
> > > From: Tesla list <tesla@xxxxxxxxxx>
> > > To: <tesla@xxxxxxxxxx>
> > > Date: 7/9/2005 4:14:49 PM
> > > Subject: Re: Large Foam Toroids
> > >
> > > Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx> > >
> > You may want to check with O. W. Landergren. I know > you'd
> > need a pretty big bulk buy, and they cost more, > but maybe
> > not too much more. They make some pretty big > spun aluminum
toroids:
> > >
> > > http://www.hot-streamer.com/adam/bigass_coil/toroid.jpg
> > >
> > > Adam
> > >
> > > --- Tesla list <tesla@xxxxxxxxxx> wrote:
> > >
> > > > Original poster: "Cameron B. Prince"
> > > > <cbp@xxxxxxxxxx>
> > > >
> > > >
> > > > Hey guys,
> > > >
> > > > David Rieben and I are planning on ordering a couple >
> > > of 48" x 12" foam > > toroids from Global Foam Company.
> > > > (http://www.globalms.com) We wanted to > > check with
> > you all to see if any of you are also > > interested so
> > that we could > > possibly place a bulk order.
> > > >
> > > > They have quoted us $345.00 for the toroid and > >
> > $142.00 for shipping, each.
> > > > We are hoping that we could get a break if we order >
> > > 10 or so. If you are > > interested, please let one of us know.
> > > >
> > > > If any of you have alternative sources for large > >
> > toroids of this size, > > please also let us know.
> > > >
> > > > Thanks,
> > > > Cameron
> > > >
> > > >
> > > >
> >
>