At 01:07 PM 8/27/02 -0500, you wrote:
>I ended up building a coil winder for the purpose.  There is a DC motor
>which I control with a variable power supply that actually rotates the
>coil, and a servomotor that moves the winding wire back and forth across
>the face of the coil.  It also has a counter so you can wind an exact
>number of turns.  The whole thing is pretty simple, if you can't find one
>to buy.

There's a book on making a coil winder available from Lindsay for cheap.
I don't have it, but it's supposed to be useful.

Here's a picture of a hand-operated one I made from a film reeler I got
at a Disney auction (the handle is geared about 3:1 to the bobbin
holder). I have a digital counter on it with an optical pickup, and it
is mounted on a sturdy base now. The box of Vachon Flakies (sp?) in
the background of the bobbin holder provided vital energy and essential
Polysorbate 80 to fuel the machining process.

http://www.trexon.com/graphics/winder.jpg


You could also use a small lathe with a counter (electronic or the
flip-lever type) and do it by hand.

Frankly, for such a small quantity, you don't need anything special.
If we had many to do, I'd pick up a CNC winder new for about $3-$4K,
which would be great for production into the thousands (quick change-
over due to the large number of programs), but it's not very attractive
compared to just buying completed parts.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
9/11 United we Stand

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