Re: Secondary winding frustration

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Brian" <ka1bbg-at-webryders-dot-net> 

Hi, snap goes the wire, put the roll of wire up on a ball bearing so it
rolls easily, then use a felt pad with a spring clip to adjust the tension.
i use a clothespin for 28 wire, but smaller wire less pressure. you will
probably have to stop the roll with you hand to prevent it from turning
after you stop. cul brian f.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, January 02, 2004 10:57 PM
Subject: Secondary winding frustration


 > Original poster: "RIAA/MPAA's Worst Nightmare" <mike.marcum-at-zoomtown-dot-com>
 >
 > In the pursuit of ever longer sparks (and for a challenge) I'm building a
 > hand held TC (a la BH-10 vacuum tester only bigger) with a high surge
 > impedence to lower sync rotary gap losses. Realized really high
 > voltages/low currents (30kv+ 10mA) are out of the question for a portable
 > handheld unit due to weight, so I decided to canibalize 1 of my other
coils
 > for its 120-7500/40 nst's. Anyway, I have a winding jig rigged that's
 > adjustable from from ~10-120 rpm assuming I don't go over the 90 vdc
rating
 > of the motor. I'm attemping to wind a 3.75 od acrylic tube with 19" of 36
 > awg (175 tpi/~3300 turns according to my wire table). I was going to use
 > 39awg, but that would have made the Fres down to less than 87 khz with my
 > 8" sphere (want it to where it barely breaks out or doesn't without a
 > breakout point, hope that's big enough) and out of range of the primary.
 > Anyway how is this stuff kept from breaking when winding? It's hard to
find
 > tune the tension to where it's tight but not stretching. I don't want a
 > solder joint (or lots of them) in the middle of the coil so every time it
 > breaks I have to start over (aggravating if this happens with over 1000
 > turns already on it). I'm thinking of adding another moter to unwind the
 > roll (fresh so weighs 10.5 lbs and has quite a bit of inertia). I can't
 > imagine how a commercial winding machine does a clean job of this. Any
 > ideas/suggestions appreciated. Up till now I've never dealt with anything
 > smaller than 30awg.
 >
 >
 >
 >