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Re: Small toroids
Original poster: "Ed Phillips by way of Terry Fritz <teslalist-at-qwest-dot-net>" <evp-at-pacbell-dot-net>
Tesla list wrote:
>
> Original poster: "John Richardson by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <jprich-at-up-dot-net>
>
> Hi Everyone,
>
> Has anyone out there made toroids as small as 8"OD from 3" drier duct? I
> have spent half of the afternoon trying to fashion a decent joint, and
> after failing to join the two decently, decided to make the joint with
> masking tape, figuring I could cover the whole thing with aluminum tape
> anyhow. I have already wasted a roll of tape trying to make a smooth
> surface, and I am very close to jumping on the whole darn thing. Any ideas
> on how to make a decent splice without covering the toroid with tape, or
> how can I get a decent finish if I do tape it?
>
> Thanks,
> John Richardson
> (One grumpy toroid maker!)
I haven't made one quite that small, but have made several using the 3"
duct. I did as you did, used masking tape to make the joint and then
wrapped several layers of masking tape on the duct until I got a
reasonably smooth surface. Seemed to take at least 4 or 5 layers.
After that I wrapped on the aluminum tape, burnishing it with the bowl
of a spoon as I went along. With your size the hole in the center may
be too small to get a decent job. Why not make it bigger?
My nephew teaches an advanced science course at a high school for
gifted children, and his classes have made several beautiful terminals
from 3" and 4" flex duct. Guess they had more patience than I do. They
also built a twin coil which gave about 6 foot arcs when using several
12 kV, 60 ma NST's in parallel. After a sales pitch by the nephew, they
got those for nothing by taking apart old signs behind a sign shop.
Ed