Re: Rotary gaps
Subject: Re: Rotary gaps
Date: Thu, 20 Apr 1995 18:11:27 -0400 (EDT)
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Subject: Rotary gaps
es>I am planning to build a rotary gap and would appreciate any suggestions or
es>comments from those who have already done this.
es>I am planning to use a 12.0" diameter nylon disc probably 3/8" or 1/2" thick.
es> If I remember what I've read, my first choice for electrodes should be
es>tungsten, then brass then copper. Is this correct? I can only find tungsten
es>in 5/16" dia. I think it is available in up to 3/8" but I haven't found any
es>yet. I was thinking that I wanted about 1/2" dia. electrodes. Any comment?
Hi Ed (great name),
Uhm... some of you all probably know this already, but tungsten rod
is sold as inert-gas welding rod. I have seen up to 1/4" stuff from
Mcmaster-Carr (expensive). Richard Hull has used 1/8" THORIATED tungsten
rod for one of his rotarty gaps. Thoriated tungsten is also a common
welding rod material and is used as a decent thermionic emmiter in vacuum
tubes (better than plain tungsten). I assume that's why Hull uses it: it
should have lower resistance for a given current/voltage. Or higher "Q" as
Mr. Quick would say :)!