[TCML] Spark gaps?

[Carl Noggle]

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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