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Re: Rotary Gap Electrodes - A first-hand experience
Tesla List wrote:
>
> >From jim.fosse-at-bdt-dot-comThu Oct 24 22:53:35 1996
> Date: Fri, 25 Oct 1996 02:35:01 GMT
> From: Jim Fosse <jim.fosse-at-bdt-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Rotary Gap Electrodes - A first-hand experience
>
> >Date: Wed, 23 Oct 1996 01:27:25 -0700
> >From: open_minded <bturner-at-apc-dot-net>
> >To: tesla-at-poodle.pupman-dot-com
> >Subject: Rotary Gap Electrodes - A first-hand experience
>
> >
> [snip to save chip;)]
> > One interesting thing though - I sure vaporized the tips off the
> >stationary electrodes in my rotary gap! Whoooeeeee. I had 1/8" tungsten
> >rods fixed into brass holders. At full poop, the stationary rods
> >achieved a nice, brilliant yellow after about 20-30 seconds. The rotating
> >electrodes (same stuff) stayed nice and cool.
> >
> [big snip to save chip;)]
> Brent,
> What power level were you operating at? I've never even heated
> up my stationary electrodes at 20A * 220V = 4400W. with my rotary
> using 3/8 bolts.
>
> jim
Jim -
Didn't measure the amps out of the wall, but from previous
recollection was around 30 amps -at- 120 volts. I do have 0.06uF worth
of primary capacitance though.
I think that the 1/8" couldn't dissapate the heat fast enough. I
have obtained 3/16" rod and will try again.
3/8" diameter yields a cross-section area of 0.110 inches. 1/8"
diameter yields 0.123 square inches, or a hair less than 1/10th the
area. Now when you multiply by length, the 1/8" rods have far less
thermal mass than 3/8". This is what I think is the problem. 3/16"
will give me 0.027 as a cross-section -- roughly 2x the area, so I
am keeping my fingers crossed.
- brent