Re: Toroid construction

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

Original poster: "D.C. Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>


We use a very skilled tig welder.  He tack welds them together at 4 -- 90
degree locations.  He also tigs on the cross braces for the center
connection using stiff 1 in wide Al. strap.  Check around at your local
welding shops.  We gave 4 different shops 4 in long samples and asked them
to do their best at welding them together.  We compared all 4 different
welders until we found the guy that could "cut apart a beer can and
seamlessly weld it back together".  That was our future contract welder.

Dr. Resonance



----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, September 17, 2002 3:54 PM
Subject: Toroid construction


> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Esondrmn-at-aol-dot-com>
>
> I could use some advise from those of you who have made toroids using
> semi-rigid flexible aluminum ducting.  I have two 9" metal pie pans that I
> plan to use back to back, then wrap the ducting around the outside.  When
I
> made some larger toroids for the big coil using corrugated plastic pipe, I
> wrapped it around an acrylic center form and cut the ends to join smoothly
> then used nylon lacing cord to tie the ends together.  How do you join the
> ends of the aluminum ducting?  Use aluminum tape?  I planned to use
aluminum
> tape to attach the ducting to the pie plates.  I will drill a 1/4" hole in
> the center of the pie plates for mounting on the coil.  Do you also maybe
> rivet the plates together?  Do you stretch the ducting out to its full
length
> then cut the ends to fit?  Or, compress it back together, evenly, until it
is
> just the right length?
>
> Thanks for the help, Ed Sonderman
>
>