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Re: Esthetically Pleasing
Perhaps it should be mentioned (however unnecessarily)
that commercial copper tubing is available in various
grades of hardness (or annealing, to be more precise)
The hardest (or least annealed) is almost rigid and
would take two men (and a strong boy) to bend at all
let alone neatly.
The softest grade (K - I believe - but I'm an electrician
not a plumber) can be bent =easily= without tools.
- - - - - - - -
A wonderful way to make a neat-o flat spiral primary
is to start with a heavy copper or aluminum sheet the
same width as the diameter of the finished spiral.
A hole is drilled in the exact center of the sheet.
The sheet is fixtured on the table of a vertical milling
machine. A spiral slot is milled from the outer edge
of the sheet toward the center. This by rotating the
sheet by means of a pin in the center hole while at the
same time using the power feed to advance the table.
The ratio of these two (rotation vs. table feed) determine
the pitch of the finished spiral.
It's best to practice with a thin sheet of hardware-store
aluminum first.
While this can be done on a Bridgeport as described,
it becomes duck-soup if one uses a vertical CNC machine
with a B-axis rotary table.
See ya 'round,
Robert Michaels
From robert.michaels-at-online.sme-dot-org Sun Feb 16 21:45:39 1997
Date: Sun, 16 Feb 1997 18:34:38 GMT
From: Robert Michaels <robert.michaels-at-online.sme-dot-org>
To: tesla-at-poodle.pupman-dot-com
Subject: RE: DC TC 2/2
(Continued from previous message)
wide that a spark barely jumps the distance. In such
case the capacitor could experience voltages close to
the peak-to-peak voltage.
T>Assuming it would be possible to pulse the DC power supply without a
T>tube would the output sparks at the secondary be longer or more
T>powerful? The same?
Definitely one or the other - IMHO
- - - - - - - -
Hey - I like your implied idea: smoking those funny-looking
cigarettes while TC'ing. Kewel! (yeah!)
Up in smoke,
Robert Michaels