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Re: More rotary gap questions... (fwd)

Subject: 
        Re: More rotary gap questions... (fwd)
  Date: 
        Wed, 16 Apr 1997 10:34:19 -0600 (MDT)
  From: 
        List owner <listown-at-poodle.pupman-dot-com>
    To: 
        tesla-at-poodle.pupman-dot-com



---------- Forwarded message ----------
Date: Tue, 15 Apr 1997 14:38:43 -0600
From: "Phillip M. Jarvis" <jarvisp-at-bee.d93.k12.id.us>
To: tesla-at-pupman-dot-com
Subject: Re: More rotary gap questions...

> Tesla List wrote:
> >
> > Subject:
> >         More rotary gap questions...
> >   Date:
> >         Sun, 13 Apr 1997 17:41:04 -0400
> >   From:
> >         "Daryl P. Dacko" <mycrump-at-cris-dot-com>
> >     To:
> >         Tesla List <tesla-at-pupman-dot-com>
> >
> > I wanted to thank everyone for the info on hot vs. insulated rotors,
> > and sources for the laminate ;'}
> >
> > Now I'm wondering about the rotating electrodes, I've heard mentioned
> > brass pins, brass screws with stainless acorn nuts, and some sort of
> > threaded holder with tungsten rods.
> >
> > I'm guessing, from what I've heard, that almost anything will work,
> > as long as your system stays in tune.
> >
> > These 'flaming power arcs' that I've heard so much about would probably
> > destroy just about anything in short order, correct ?
> >
> > I'm thinking about useing the 'brass screw/acorn nut' method, since it
> > seems so easy to make/repair/balance...
> >
> > Does anything in the collective wisdom suggest a better solution ?
> >
> > Thanks again,
> >
> > Daryl
> 

Daryl:

> I just received information from Ross Engineering Corp. (408) 377-4621.
> In addition to making static spark gaps at $450 a pop, they make
> toroids, spheres and corona nuts for spark gaps. What interested me are
> the non melting carbon spheres with tapped holes for screws/bolts. The
> sphere diameters range from 1 cm to 30.5cm. The advantage of carbon is
> that it does not "pit" or "peak", and handles the heat very well. These
> were made specifically for spark gaps, lightening arresters, and other
> high current applications in pulse forming networks.
> I will be getting a price list - they did quote the 3/4" dia. (1.9cm)
> spheres threaded for 1/4-20, 1/4-28 or 10-32 are $40 ea.
> 
> The corona nuts are made from aluminum and should be way more cost
> effective.
> 
> Phil Jarvis