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Re: primarys (how to wind flat coils)
From: Chip Atkinson[SMTP:chip-at-XiG-dot-com]
Reply To: Chip Atkinson
Sent: Wednesday, November 05, 1997 2:10 AM
To: Tesla List
Subject: Re: primarys (how to wind flat coils)
Another method is to make "combs" with either a slot tooth profile, or a
semicircle profile. I have done both. I cut the strips to the correct
dimension and put the teeth in using different methods, depending on the
desired profile.
For slots when making a ribbon primary I use a table saw, since that's
what I have. A radial arm saw would be easier, a hand saw harder, but it
would still work relatively well.
For semicircles, I use an end mill and a drill press. I set up a
pair of fences on the drill press table to prevent the material from
moving. I used an end mill because I had it. If I didn't, I would have
sawn the comb material a bit wider so that I could drill a row of holes
entirely in the material. (The problem is that if your hole doesn't fall
entirely within the material, the drill will wander).
With the end mill, I was done in one pass. If I used a drill bit I'd then
saw the edge off the combs to produce a piece with a bunch of notches.
(Of course you should use a drill or mill the same diameter as your
tubing, and the comb material should be thin enough so that it doesn't
really affect the radius of curvature in your primary. I find 1/4" (6mm)
works well.)
Here's a great trick that I discovered a while back: Saw (or mill) so
that the center of the holes is about 1/16" (1.5mm) (roughly) behind the
edge of the comb material. This way you get a notch with the profile
close to a "C", rather than a "(". The advantage of this is that you can
then snap in your tubing as you coil it up and it'll stay in place.
Chip
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Chip Atkinson; Xi Graphics 1801 Broadway, Denver CO 80202
(303)298-7478voice (303)298-1406fax (800)946-7433sales
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