Re: spacewinding techniques..RE: Designing BIG Secondary Coil

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "robert heidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-desertgate-dot-com>

Colin: I have used thick vinal insulated # 24 wire and Weed-Wacker to space
the wire. By winding the wire with W-W line and keeping tension on the wire
the W-W will jump off the coil form when released as it tends to spring out
into a larger coil. Mono-filament line dosent jump free. A coat of wet
varnish will stick the wire and mono-fillament can be pealed free before the
varnish dries hard. I hope this helps.
  Robert  H

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Wed, 11 Sep 2002 12:48:47 -0600
> To: tesla-at-pupman-dot-com
> Subject: Re: spacewinding techniques..RE: Designing BIG Secondary Coil
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Wed, 11 Sep 2002 13:12:05 -0600
> 
> Original poster: "colin.heath4 by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <colin.heath4-at-ntlworld-dot-com>
> 
> the other option is bailing twine its made from poly prop so would be ideal
> and could be left in place although i dont know about the appearance of it
> though
> many thanks
> colin heath
> ----- Original Message -----
> From: Tesla list <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Monday, September 09, 2002 8:08 PM
> Subject: spacewinding techniques..RE: Designing BIG Secondary Coil
> 
> 
>> Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <jimlux-at-earthlink-dot-net>
>> 
>> At 11:58 AM 9/9/2002 -0600, you wrote:
>>> Original poster: "Malcolm Watts by way of Terry Fritz
>>> <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>
>>> 
>>> 
>>> 
>>>> How are you accomplishing space winding?
>>> 
>>> Bifilar wind two lengths of the same gauge wire. Fix at both ends.
>>> Stand the coil upright, then let one of the lengths go. It neatly
>>> unwinds/unpeels itself to part-way down leaving the spaced wire
>>> intact. Some spray varnish applied to the exposed winding holds it,
>>> then you can snip another length and let it unravel. I ended up with
>>> a bundle of various lengths at the base of the coil, some of which I
>>> re-used for other projects. The ideal would be to unwind the spacing
>>> wire back onto a reel but great care would be needed not to disturb
>>> the wanted winding.
>>> I am planning to wind two others, one 10", the other 12"
>>> sometime in the future using much the same techniques. This time they
>>> will be using thinwall pipe left over from a construction project at
>>> work.
>> 
>> A cheaper approach to the bifilar winding technique is to use nylon
>> monofilament fishing line as the second "wire" for spacing.  You can just
>> leave it on when you are done, or not, depending on your feelings about
> its
>> RF and HV properties (nylon IS hygroscopic..) .  You can get cheap
>> monofilament in a variety of sizes to allow customizing the interwinding
>> spacing.  There are also all manner of less expensive wires to use in a
>> sacrificial way than copper.. iron baling wire springs to mind.
>> 
>> Now, someone just has to turn up a "pounds test" to "monofilament
> diameter"
>> table or equation, and we're all set.
>> 
>> "Weedwhacker" cable might also work as a spacer, but I suspect that it's
>> more expensive than fishing line (although... in a big spool, maybe not).
>> Some of the more sophisticated (expensive?..I haven't checked) weedwhacker
>> line is square or triangular in cross section, which might make for nicer
>> windings.  The stuff should be "real cheap" because it doesn't cost any
>> more than round monofilament to produce, and is probably less well quality
>> controlled (nobody is going to whine about losing the big fish or the
>> smoothness with which the line comes off the spool).
>> 
>> 
>> 
>> 
>> 
> 
> 
>