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Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx>


A really tough but very too expensive toroid can be made with corregated
black plastic flexible drainpipe.  It is commonly available at Home Depot
and Lowe's in 3 and 4 inch diameter, but you can get larger diameters at
plumbing stores.  Just cover the surface with strips of aluminum tape.  To
join the ends together, one way is to cut a 4 inch piece of the same pipe,
cut a piece out along it's length so it can be compressed and fit into the
ends of the toroid.  It will expand out into the groves.  Use some small
sheet metal or grabber screws, placed in grove bottoms,  through the toroid
ends into the piece inside.  You will need some help to hold the ends
together until it is secured with the screws.

As far as heavy duty switches, you may want to consider using contactors
(heavy duty relays) instead of switches.  The other alternative is to use
circuit breaker switches to kill two birds with one stone.

--Steve Y.
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, March 26, 2005 10:19 PM

> Original poster: Teslamad@xxxxxxx > > I've been coiling for years now and im about to complete my latest coil. > This coil was built for research purposes. It runs off a 14,400 10KVA > X-former, but unfortunately before it will be operational, it needs a > toroid. I have tried building it MANY times from Home Depot ducting with > unsuccessful (expensive) results!!! The ducting used by other coilers > appears more ridged than mine... hmm... Could you please tell me where to > get this other material or how to handle the ducting (dentable and fragile) > I've been getting from home depot? Also, one other thing, where do you > purchase heavy duty switches for control panels and how much are they (240v > 50A)??? > > Thanks, > ~Drew > > > >