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

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

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).
>
>
>
>
>