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Re: First Italian teslathon, PICS available! :-)
Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
The cylinder with two hemispheres on each end is a very popular style for
VDGRF design. It allows a very wide belt to be used which translates into
relatively high output currents --- usually several hundred mA. We rebuilt
one with this style terminal (84 inch dia.) for the Science Museum of
Minnesota and it put out over 330 mA when energized.
The rings are a voltage grading system which allows for more accurate
voltage regulation which is necessary for nuclear experiments with heavy
ions, etc. These are not usually required for home brew VDGRFs unless
you're going to do accelerator experiments.
You can form a simple voltage grading system by winding two turns of bare
copper wire, 12 AWG, around the central insulating column every 12 inches.
At one point where the copper wire ends twist in around the 2 turns and form
a sharp point leading downward toward the next ring. This allows leakage
and provides a more even potential gradient along the belt and insures
better regulation at the top terminal. 1/2 inch dia. copper tubing soldered
into rings also work. They are usually suspended with a few drops of
silicone on 120 degree spacings.
Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo WI 53913
> In the background of a couple of the photos there is a Van de Graaff
> generator. Can you please put me in touch with someone who knows about
> it. I have just got one which was built in the 60's and I want to find
> out about the rings around the support.
> Cheers, Chris (NZ)
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Monday, 10 May 2004 12:51 p.m.
> To: tesla-at-pupman-dot-com
> Subject: First Italian teslathon, PICS available! :-)
> Original poster: "Mc Gyver" <mcggyver-at-tiscali.it>
> Hi all!
> Some pics of 1st Italian teslathon available in this site:
> Our first teslathon took place on 17th april 2004 in Vimercate,
> near to Milan with the helping hand of A.I.R.E. ( italian oldradio
> club )
> and the municipality of Vimercate.
> Many thanks at Vimercate's mayor for the souvenir plate! ;-)
> Happy viewing :-)