Re: [TCML] sucker gap material

[Bert Hickman <bert.hickman@xxxxxxxxxx>]

Dan,

Gary is right. When used in a spark gap, small amounts of the electrodes 
will be vaporized. This has the potential of spreading microscopic 
fragments of various oxides of chromium and nickel into the air in the 
immediate vicinity. Some of these (especially hexavalent chromium) are 
carcinogenic, while others can stimulate allergic reactions, or even 
cause internal organ damage. These are recognized hazards when welding 
stainless steel. Brass, copper, or tungsten would be safer (and perhaps 
even better performing) choices.

Some more info:
http://www.weldreality.com/Safety stainless issues.htm

Bert


Lau, Gary wrote:
> I would choose brass fittings over SS for a variety of reasons.
>
> The cost of two brass fittings can't be that great compared the rest
> of your coil, even if SS is free.  Machining SS is a lot tougher than
> brass.  I think I recall hearing that if SS is heated, it may emit
> toxic fumes, but can't confirm this.
>
> As to the opening, I think you're referring to the axial hole in the
> fittings.  The thing that matters is the air velocity through the arc
> channel.  I don't think the axial hole diameter will affect this too
> much, as long as it's not too small.  Mine was roughly 3/8" diameter;
> I wouldn't go smaller.
>
> Regards, Gary Lau MA, USA
>
>
> > -----Original Message----- From: tesla-bounces@xxxxxxxxxx
> > [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Dan Casaregola Sent:
> > Tuesday, March 16, 2010 7:48 PM To: Tesla Coil Mailing List
> > Subject: [TCML] sucker gap material
> >
> > I'm building a sucker gap, and was wondering whether stainless
> > steel would be acceptable as gap material as opposed to copper or
> > some other metal.  I have a neighbor who tells me not to buy any
> > type of fittings since he has plenty (all stainless steel).  Second
> > question; what size opening is appropriate in the gap? Larger
> > opening allows greater flow of air, therefore better cooling?  Or
> > smaller opening causing increased pressure of air stream?  Thanks
> > Dan _______________________________________________ Tesla mailing
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