Re: [TCML] Spark gaps?

[Carl Noggle <cn@xxxxx>]

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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