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RE: Making Flat secondaries - disaster #1...



Original poster: "Pete Komen by way of Terry Fritz <twftesla-at-qwest-dot-net>" <pkomen-at-zianet-dot-com>

Terry,

A local glass shop here in Las Cruces drilled holes in glass for reasonable
cost.  The glass cannot be tempered.  You could get it cut in an octagonal
shape to get rid of the pointy corners and large overhang.  I think they can
even smooth the edges.

Regards,

Pete Komen

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Friday, February 15, 2002 7:53 PM
To: tesla-at-pupman-dot-com
Subject: Making Flat secondaries - disaster #1...

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi All,

I worked on my new flat secondary tonight and I wanted to warn you 'not' to
try this method ;-P

I took a sheet of 18 x 18 inch plate glass 1/4 inch thick and I glued a 1/4
inch brass bolt to the center with silicone.  I got a big "Lazy Susan" turn
table bearing to rotate the glass on.

The plan was to use double sided tape on the glass to hold the #24 wire
windings as I turned them to place:

http://hot-streamer-dot-com/temp/flat0.jpg

Once done, I could spray coat it to make it stronger.  An alternative was
to use spray adhesive in place of the tape.

This is how it turned out:

http://hot-streamer-dot-com/temp/flat1.jpg

I think the inductance is sort of low :o))

The basic materials are all sound but the #24 wire could easily pull away
from the tape in large chunks.  The tape was no match at all for the
stiffness of the wire.

"Next", I am thinking of using a second sheet of glass (I really worry
plastic will not be stiff enough) and spacing it at 21.5 mil to wind the
coil between the sheets.  I will probably have to glass drill a hole in the
sheets for the terminal and bolt to hold the sheets together.  Wow!!  I am
really looking forward to drilling the glass =:O)))  The winding will have
to be loose enough so as not to press against the sheets too much.  A tiny
bit of pressure from each wind could add up to a ton (maybe literally) when
500 winds are in place.  One disadvantage of having the wire between sheets
is that I can't probe it for secondary voltage profiles.  Maybe not a big
deal since Paul's programs are real good :-))  I sort of wonder what effect
the coil holding forms will have on the coil...

Cheers,

        Terry