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

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

Original poster: "Brian by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ka1bbg-at-webryders-dot-net>

Well, fishing line is a very highly engineered product. as for trimmer
string maybe not. cul brian f.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, September 10, 2002 2:00 PM
Subject: Re: spacewinding techniques..RE: Designing BIG Secondary Coil


> 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).
> >
> >
> >
> >
> >
>
>
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