Re: pie pan toroids

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

Original poster: "Matthew Smith by way of Terry Fritz <twftesla-at-qwest-dot-net>" <matt-at-kbc-dot-net.au>

Hi Ralph, All

Do you have any pictures posted that we can share?

Cheers

Matthew Smith

Tesla list wrote:
> 
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Parpp807-at-aol-dot-com>
> 
> Hi all,
> I have just completed two toroids for the ends of my 48 inch bipolar. This is
> a first
> time for me so I am hoping for some input from the list.
> 
> The aluminum ducting is a 4 inch ID Super-flex from McMaster-Carr, item #
> 5525K44.
> Thirty dollars gets you a 2.5 ft length of the stuff that can be expanded
> to 30 feet. Not a misprint.
> 
> I formed two toroids of a 16 inch OD. Cutting the aluminum with a scissors is
> easy enuff
> even tho this is a very heavy foil. The problem is getting an even cut as you
> cut across
> the pleating. I am going to need much more practice at that. I bot two rubber
> pipe couplings for inside the toroids to join the two ends. The pipe
> couplings are a semi-
> hard rubber. They are made for joining two pieces of pvc or cast iron pipe.
> They come with
> two of the stainless steel "worm-drive" clamps that you will have leftover
> for your
> collection of general stuff. I bot the couplings for a 3 inch pipe. That's
> the ID, but the walls          of the couplings are at least 5/16 thick and
> the whole thing fits neatly into the 4 inch ID ducting.
> Bringing the two ends of the ducting to form a neat joint is a problem. I
> drilled thru the
> ducting and into the rubber insert. I tapped the holes for 6-32 MSs. I used
> nylon screws, but I doubt that is necessary. The finished joint between the
> two ends of the toroid
> is very far from being neat. Actually, I don't like it. I wrapped some
> aluminum foil
> around it but I am going to have to see how much corona spits out from the
> joint.
> I will know more, later.
> 
> The bipolar coil is horizontal. The 16 inch OD toroid mounts on the 1/4 - 20
> end studs of the coil. I used two aluminum pie pans as sort of hub caps to
> fit the ID of the toroids.
> Sort of like the toroid is the tire and the pie pans are the wheel so the
> flare-out of
> the pie pan faces outward. I put a large piece of thin acrylic against the
> face of each
> pie pan to distribute the pressure over the surface of the aluminum pan. A
> 1/4-20
> brass nut  squeezes the whole contraption together. As the nut tightens, the
> pie pans
> seat against the toroid and the monster goes into a true round shape.
> Neat like nuthin.  :-))
> 
> It now remains to be seen how much corona is going to be spitting out of the
> joint between the two ends of the ducting. I'm afraid there is going to be a
> problem with
> that.
> 
> Cheers,
> Ralph Zekelman

-- 
Matthew Smith
KBC, PO Box 150, Kadina, 5554, S. Australia
Ph: (08) 88 212 395  Fx: (08) 82 190 157
http://kbc-dot-net.au