Re: How to wind a simple Pancake Coil in less than an hour... (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 25 Jun 2007 21:13:02 +0000
From: Jeff Behary <jeff_behary@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: How to wind a simple Pancake Coil in less than an hour... (fwd)

Antonio,

First off, I love your website incidentally.  It is a real treasure!

The multi-layered coils (even 16 turns per layer or more) work really well.  
I have dozens of antiques like this, and made quite a few too.  They are 
much more efficient than just a flat spiral, and can operate on much lower 
power levels (even less than 100 watts).

I created this thread just as a basic page for someone who wants to try and 
build something simple first.  The multilayered coil is next, and is much 
more involved in the winding process.   However, if you use thin paper for 
the interleaves you can wind the wire as you would normally back and forth 
and still have the equivalent of many turns per layer.  The only difference 
is that each turn will increase in diameter around .001" or so depending on 
the paper used.  This doesn't effect performance noticeably.  This does make 
winding the coil easier, because you don't have to cut the paper for each 
layer and then try to reinsert it at a new location or worry with the 
windings coming loose/etc.  If you have done this before, you know it is 
kind of messy and you must be careful not to have all of the seams in the 
same location or the coil will turn egg-shaped...and sometimes you also need 
more than two hands.  The continuous paper method is one I never have seen 
in the past and I think it does well.  Since each turn is a little bigger 
and each theoretical "layer" is slightly conical - you almost end up with 
the concept used in the "Klingelfuss" Induction Coils (often mentioned in 
the early 1900s)  - but a bit simpler, sturdier, and in this case adopted 
for Tesla Coils.

Some more photos are here:
http://www.electrotherapymuseum.com/WhatsNew.htm


Jeff Behary, c/o
The Turn Of The Century Electrotherapy Museum
http://www.electrotherapymuseum.com

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