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Re: Sonotube HV properties (fwd)



---------- Forwarded message ----------
Date: Sat, 01 Mar 1997 15:55:07 -0800
From: "David E. Sharpe" <sccr4us-at-erols-dot-com>
To: Tesla List <mod1-at-poodle.pupman-dot-com>
Subject: Re: Sonotube HV properties (fwd)

Tesla List wrote:
> 
> ---------- Forwarded message ----------
> Date: Fri, 28 Feb 1997 21:40:22 -1200
> From: Ken Smith <ksmith-at-ihug.co.nz>
> To: Tesla List <mod1-at-pupman-dot-com>
> Subject: Re: Sonotube HV properties (fwd)
> 
> At 21:12 27/02/97 -0700, you wrote:
> 
> >Ed, Greg, and all,
> >I have noticed that a lot of little park playgrounds have these slides that
> >are made from plastic tubing that is large enough for the children to slide
> >inside of them. The middle section is a straight section that is bolted to
> >the curved sections. This straight section would make an ideal coil form,
> >wouldn't it? I wonder who actually manufactures the plastic sections, and
> >what they would charge for one? Anyone out there with a tape measure who
> >can tell us what the dimensions (length, diameter) on the straight tube
> >are? I know they are made of plastic with a high insulation value. I would
> >guess that they are fairly expensive, but it looks like they would be
> >excellent coil forms. Has anyone out there used any of these?
> >
> I have followed this secondary debate with some interest (if only academic
> <g> - mine is only 4 inches across (and I am talking secondaries here <BG>))
> 
> If you want to wind a big secondary, could you not go open in the same way
> as the primary. Does there have to be something between the wire and the center?
> 
> My thought was to use 1 inch poly tube as verticals spaced say around a 3
> foot circle with a suitable number of formers up the height of same and at
> the top for rigidity.  Although this would only be an approximation of a
> circle (depending upon the number of pipes) - is seems to me that this
> wouldn't matter. How you would rig this on a jig for winding is another
> matter - but in principle would it work ?
> 
> Over.
> 
> Ken
> Ken Smith
> Weymouth
> Auckland
> http://homepages.ihug.co.nz/~ksmith
> ksmith-at-ihug.co.nz

Ken
 I built a driver secondary for a magnifier secondary exactly
as you are proposing.  I cut two rings out of 3/4" plywood, and
ran 18 vertical slats of fiberglas from the outside.  The rings
and slats have dado slots to interlock, when the slats are
installed from the outside circumference of the rings.  It is
a pain to install all of them, but once "together", 3 wires weree
run through supplied holes, and twisted like to pull assembly together.
Once wires are tightly wound on form, assembly wires are cut
and removed. VOILA, a secondary form that is basically air (light
for its size) to any diameter one has the inclination, handling
equipment and money to fabricate.

DAVE SHARPE, TCBOR