Re: Making a Toroid

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Nick Andrews by way of Terry Fritz <twftesla-at-qwest-dot-net>" <nicothefabulous-at-hotmail-dot-com>

You can also get corrugated stainless steel in a similar configuration.  
It's used to line chimneys for some fireplace inserts.  Any good 
fireplace/stove store should have it.  It's way tougher than Al duct, and 
comes in some bigger sizes, too.  Don't expect it to be free, however...

Nick Andrews, Denver, CO, USA


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Making a Toroid
>Date: Fri, 31 Aug 2001 10:36:36 -0600
>
>Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><Parpp807-at-aol-dot-com>
>
>In a message dated 8/30/01 8:03:55 PM Central Daylight Time, Par pp 807
>writes:
>
><< In a message dated 8/30/01 9:25:54 AM Central Daylight Time,
>tesla-at-pupman-dot-com writes:
>
>  Hi Scott,
>
>  Thanks for the suggestions. Are you sure we are talking about the same
>stuff? This is
>  a tuff aluminum and it's very rigid. If I just let it hang straight down 
>it
>won't expand of its own weight. Also, if I try to crush it a little as to
>ovalize it, the stuff will just crack. It's
>  very strong in cross section. McMaster sells only the 2.5 ft length. I
>looked around in our Lowes and I see nuthin like it. The unstretched 2.5 ft
>will not make a circle. I experimented and found that the smallest diameter
>toroid I can make without cutting the coil is around 19 inches which 
>required
>an expanded length of around 3.5 ft. So what I'm gonna do is cut the 2.5 ft
>coil into two pieces and expand each piece as far as needed in order to get
>my 14 inch toroids. Then I plan on using two aluminum pie pans, one on the
>top and one on
>  the bottom. The pie pans (Dutch apple and lemon harangue) will fit very
>nicely within the minor diameter of the toroid. A hole thru the center will
>fit the mounting stud with maybe
>  an aluminum spacer between the two pans so they don't squeeze together.
>  Do you have any ideas on how to join the two ends to keep sharp points to 
>a
>minimum?
>  John Freau says he uses a wooden plug and small nails which doesn't sound
>bad. I think I will try to just burnish the edges and wrap them with duct
>tape. We'll see what happens.
>
>  Thanks again for the suggestions.
>
>  Ralph Zekelman
>
>  << Hi Ralph...
>
>   sounds like the stuff most of us use ( the same stuff from Home Depot 
>etc.)
>   try to
>   leave the tube "compressed"... makes it more ding resistant. Once you
>   streach this
>   stuff out it becomes very weak ( remember its ducting ... made to be put
>   into place
>   and never touched again ) and it doesnt "play" well.
>
>   Definately make a center ring out of thin plywood ( 1/4" or less) to 
>help
>   shape and
>   support the toroid.
>
>   Scot D
>
>
>
>
>    >>
>   >>
>
>
>


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