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Re: [TCML] secondary coil form
Carl,
I went to a local plastic supply company and
asked for PVC "duct" pipe, of the 12" diameter
variety. It is made for low pressure air duct ser-
vice and has thin (~1/8" thick) walls. They had
a 10 ft. piece of it and since at the time another
fellow coiler was in town visiting me, we went
in together to purchase it and then cut it in half so
we would each have a 5 ft. long piece. Yeah, the
large diameter PVC is a bit pricey (IIRC, around
$5 to $6 / ft, back around '03, I believe). Both peices
are still going strong in their respective coils to this
day, though (Green Monster is mine and the other
is in Cameron Prince's big SG coil).
http://www.youtube.com/watch?v=t23mGSW2k6c
http://www.youtube.com/watch?v=KRAgO2Xn-t8&feature=related
David Rieben
----- Original Message -----
From: "Carl Noggle" <cn@xxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Sunday, February 12, 2012 12:59 PM
Subject: [TCML] secondary coil form
Hey--
What does everybody use for a form for winding a secondary? My
secondary was (note the past tense) wound on a cardboard tube as a
temporary measure, and as such things go, it has lasted for 20 years.
However, an errant spark traveled between the wire and the cardboard in
the little triangular air space between the end of the last paper turn
and the wire, and that was the end of a long and illustrious career.
The coil was 12 inches in diameter and 30 inches long, and I would like
to wind one about 10 to 12 inches dia by 36 inches long. The obvious
choice is PVC pipe. What is everybody's experience with PVC, and is
there something better in a reasonable price range?
Thanks much for the help.
---Carl
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