RE: [] conical secondary (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sun, 17 Jun 2007 07:37:18 -0500
From: David Thomson <dwt@xxxxxxxxxxxx>
To: 'Tesla list' <tesla@xxxxxxxxxx>
Subject: RE: [] conical secondary (fwd)

Hi Bart,

A four foot coil can't be that much harder to wind than a five foot coil.
Several of my coils are double wound (bifilar) and one of them is triple
wound (trifilar).  I could easily have removed one of the double wound wires
to make a space wound coil.  

The Plexiglas is easy to cut with a jig and a quarter inch hole drilled in
the center.  Just revolve the square Plexiglas sheet into a band saw and it
quickly produces a nice circle, although winding on a square is just as
easy.  I used to spray the Plexiglas with contact cement the night before
winding, but then I found much better results by painting a couple layers of
polyurethane on the Plexiglas.  As the polyurethane gets tacky, I start
winding.  On the large coils, I stop periodically and place a flat board
weighted with bricks on top to hold the wire in place and allow it to dry.
It may take a week to wind a large coil with fine wire, or about an hour to
wind a 13" coil with fine wire.  Preparation and patience are the key.

I understand, however, the desire to build an aesthetic wooden frame that
resembles Tesla's design.  I admire yours and others efforts to go through
the trouble to produce real art with Tesla coils.  

David W. Thomson  

> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx] 
> Sent: Saturday, June 16, 2007 8:54 PM
> To: tesla@xxxxxxxxxx
> Subject: Re: [] conical secondary (fwd)
> 
> 
> ---------- Forwarded message ----------
> Date: Sat, 16 Jun 2007 19:21:29 -0700
> From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: [] conical secondary (fwd)
> 
> Hi Dave,
> 
> Yes for small flat secondary's. I did the same for simple 
> closewound flat coils. That's very easy. However, try a large 
> 1/4" space between turns for a big 5 foot diameter coil. The 
> methodology of winding the coil takes on a whole new life.
> 
> Take care,
> Bart
> 
> Tesla list wrote:
> 
> >---------- Forwarded message ----------
> >Date: Sat, 16 Jun 2007 19:14:34 -0500
> >From: David Thomson <dwt@xxxxxxxxxxxx>
> >To: 'Tesla list' <tesla@xxxxxxxxxx>
> >Subject: RE: [] conical secondary (fwd)
> >
> >Hi Bart,
> >
> >  
> >
> >>and flat secondary's are a real pain in a$$. Winding it is 
> easy, but 
> >>building the supports for large flat coils is the difficult part.
> >>    
> >>
> >
> >A large sheet of quarter inch Plexiglas works fine.  I have 
> over a dozen
> >tight wound flat spirals up to 4 feet in diameter with 
> various gages of
> >magnet wire on this type of form.
> >
> >Dave
> >
> >
> >
> >
> >
> >
> >  
> >
> 
>