Re: [TCML] Spark gaps?

[jhowson4@xxxxxxxxxxx]

Well, I already have the tungsten, If you recall I did a group buy and some custom cutting over the summer. I have enough currently that if i cut it into .75" lengths I would not have to order anymore. Which would be ideal. 


I was thinking of making stator electrodes that look like this. 
With the tungsten press it into the brass, and the hunk of brass being adjustable. in the vertical mount. 
Doing this might take some extra machining time, but it would eliminate my need for close tolerances. which was my problem with the disk based gap I was building. This will be a propeller gap. 
I will be having 24 electrodes, their purpose being for a version of steve youngs twin gap DC coil. 

http://i139.photobucket.com/albums/q295/JHowson/Capture.jpg 



Thanks, 
John "Jay" Howson IV 


"Why thank you, I will be happy to take those electrons off you hands." 

----- Original Message -----
From: "Carl Noggle" <cn@xxxxx> 
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> 
Sent: Monday, November 14, 2011 9:56:05 AM 
Subject: Re: [TCML] Spark gaps? 

You can get sintered copper-tungsten with a composition or about 15% Cu 
- 85% W. One brand name is Elkonite. These machine about as easily as 
free-machining brass, so you can make a hemispherical dome shape and 
thread it for mounting. l have been running my 1800 watt coil for about 
twenty years with a blown gap of this material and it shows no wear and 
has never even needed polishing. Look up copper-tungsten on Google. 
It's good stuff. 

---Carl 



> If you keep the gap temperatures low enough (gap current, air-blast, etc) 
> why not simply nickel-silver braze tungsten disk blanks onto steel 
> threaded studs??? Also try welding shops, the earlier TIG welders used a 
> spark-gap HF arc stabilizer (Tesla coil!) and used screw-in replaceable 
> tungsten tips in the spark gap unit. 
> 
> - b 
> 
> 
> 
> 
>> Hello all, 
>> 
>> 
>> Does anyone have a recommendation for the spacing of the tip of a tungsten 
>> electrode, to the hunk of metal that it mounts in? I am trying to minimize 
>> the amount of tungsten per gap, as to maximize the usage of the tungsten I 
>> have. 
>> 
>> 
>> Its going to be a propeller style gap. powered with either a mot stack or 
>> a PT. 
>> Currently I was planning on stationary electrodes consisting of 1/2" OD 
>> brass, with .75" length of 1/4" OD tungsten press fit into the brass such 
>> that it would be protruding .375". 
>> 
>> Suggestions? 
>> 
>> 
>> Thanks, 
>> John "Jay" Howson IV 
>> 
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> 
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