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Re: Bending plexiglas to create a coil form (fwd)
---------- Forwarded message ----------
Date: Wed, 29 Apr 1998 23:24:26 +0000
From: randy <randy-at-gte-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Bending plexiglas to create a coil form (fwd)
> Date: Wed, 29 Apr 1998 20:50:32 -0600 (MDT)
> To: tesla-at-pupman-dot-com
> Subject: Re: Bending plexiglas to create a coil form (fwd)
> From: Tesla List <tesla-at-pupman-dot-com>
>
>
> ---------- Forwarded message ----------
> Date: Wed, 29 Apr 1998 14:40:33 -0700
> From: Jim Lux <jimlux-at-earthlink-dot-net>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Re: Bending plexiglas to create a coil form (fwd)
>
> Tesla List wrote:
> >
> > ---------- Forwarded message ----------
> > Date: Wed, 29 Apr 1998 16:02:27 EDT
> > From: FutureT <FutureT-at-aol-dot-com>
> > To: tesla-at-pupman-dot-com
> > Subject: Re: Bending plexiglas to create a coil form
> >
> > In a message dated 98-04-29 15:51:42 EDT, you write:
> >
> What is so special about a round coil anyway. Why not make it polygonal,
> with filleted corners. An octagon would be easy with a strip heater, and
> the corners might not add too much E-field stress...
>
>
Food for thought: remember the old "Airdux" and similar coils
used in MW/HF transmitters? A wire bent into round form, em-
bedded in four plastic supports? Taps were periodially bent inward
to facilitating taps by tine removable clips, but I suppose this
would be undesirable in a TC secondary. I don't know the com-
position of the greyish wire, perhaps tinned copper?
My point being, now you have four, relatively small contacts per turn
rather than a presumably lossier 360 degree contact(with the form).
The big question would be to find a wire with suitable stiffness AND
electrical/insulation qualities. I'm sure a bit of practice would be
required to assemble something that looked and functioned as
desired.
I suppose you could pre-notch the individual plastic rods, and
embed them to the proper depth in a cylindrical foam form, wind a
stiff wire thru it all, and then solvent-melt the foam after melting
or solvent-welding the plastic rod gaps over the wire.
I am guessing that the essentially air-core would not suffer from
insulative problems, wouldn't inter-turn arcing be more likely than
arcing thru the air "form"?
Just my $.02.
Randy
Just my $.02.
Randy