Re: toroid parts...

Tesla List wrote:
> >From ntesla1-at-vm.sc.eduSat Aug 10 13:35:39 1996
> Date: Sat, 10 Aug 1996 13:46:10 -0300
> From: Dan <ntesla1-at-vm.sc.edu>
> To: tesla-at-poodle.pupman-dot-com
> Subject: toroid parts...
> Hi all,
> Recently I was in the Newark, New Jersey airport (USA), and I saw a really
> amazing thing: (don't laugh now ;)
> All of the trash cans in the entire terminal are topped with really nice,
> spun aluminum toroids. All anyone would have to do is cut the toroid off the
> top of the can, attach a center-disk, and that would be it, no problem.
> There seemed to be two sizes: (esimating from memory) 5 or 6 inches by 24
> inches, and 8 inches by 36 inches. And being mass-produced trash cans, they
> can't cost *too* much, but I had little inclination to try and find out
> where they buy their trash cans during a half-hour lay-over. ;) I only
> mention it because someone might find the company that makes them, and if
> they're already set up for that type of spinning...
> Also, I was at our local Home Depot do-it-yourself store, (Columbia, South
> Carolina) and noticed that they had aluminum ducting, like the type one
> would use for a clothes-dryer exhaust conduit, from 4 inches in diameter, in
> 2 inch increments, up to 10 inches in diameter! And none of the conduit was
> expensive. However, the material is easily dentable and requires care in
> handling. I figured if I was going to buy say, 3 of each size amd make
> toroids of varying diameters, I might go ahead and fill each one with
> polyurethane packing foam, the kind that sprays from a can and expands to
> fill the packing space. (After the toriod is completed of course) The foam
> wouldn't provide *that* much more support, but some is better than none.
> Thoughts?
> Dan  <ntesla1-at-vm.sc.edu>


I think you will find that whatever you use to reinforce the center of
the toroid will make the entire assembly very stiff. I have used
masonite and just plain 1/8" plywood with excellent results. I use a
bead of alumunum glue on both sides of the center piece to firmly attach
it to the duct and let it dry well. Then I connect the center mounting
hole to the toroid using aluminum tape with adhesive on one side.

Good luck