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Re: Different secondary design ?
I've not made a secondary this way, but I have used cardboard moulds for
epoxy resin work in the past. One improvement on using hot water is to add a
little liquid detergent, it speeds up the penetration of the water no end.
Steve
----- Original Message -----
From: Tesla List <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, May 14, 2000 6:08 PM
Subject: Re: Different secondary design ?
> Original Poster: BillEaver-at-aol-dot-com
>
> Jeroenb and list
> My 2ndary is made like this. 10.5"dia cardboard tube
> covered with LDPE sticky tape, with close wound #21 DBL enamel
> magnet wire. Coil is 30.5" long with 960 turns at 2640 feet of wire
> length. Heavy brass foil strip soldered to wire for ground contact,
> with four coats of "Klenks Tub and Tile enamel epoxy paint" to
> cover the whole thing. Waited 5 days for this to cure like the box
> says ... next Fiberglass with two wraps of glass cloth (fine weave)
> Then two final coats of resin. The coil is now turning slowly on the
> same geared motor that it was wound on so it doesn't drip or sag.
> My game plan is to spray the cardboard with a water and oil mix
> and then tear it out to expose the bare wire to coat it with epoxy paint.
> Then close off the inside of the coil with thin Fiberglass sheet board.
>
> You don't need oil in your cardboard softening spray, just use hot water.
> I will fiberglass another smaller tube into the center of this 2ndary so
> that I can run this coil under oil as this size of coil has many self
strike
> tendencys.
> Denis Despins
> KC6TRW
>
>
>