Re: Secondary winding frustration

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

Original poster: Liviu Vasiliu <teslina-at-yahoo-dot-com> 

For very thin wire I would go for manual winding.
Motor driven winding jigs are too risky. Another
method will be to wind the pipe imediatly after you
varnished it. The varnish will fix the wire (it will
not become loose)so you can decrease a little the
tension in the wire. Od course you have to be
attentive with the wires alignement so the speed will
be low (but I found that little interspaces between
wires dont matter too much, its more dangerous to have
overpassed wires).

teslina
 >
--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > 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.
 >
 >
 >