Re: [TCML] JAVATC - Question

[otmaskin5@xxxxxxx]

Thanks Greg?- some good ideas.??Dennis? 


-----Original Message-----
From: G Hunter <dogbrain_39560@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Sat, 14 Mar 2009 4:56 pm
Subject: Re: [TCML] JAVATC - Question




If you use drawer or cabinet knobs, make sure they are solid brass.  Most 
furniture knobs are brass plated zinc alloy.  The brass coating will burn away 
quickly, leaving rough, pitted zinc alloy to carry the arc.  Not good.  Make 
sure the knobs you select really are solid brass.  They will be easy to identify 
by their much higher price tag!

I found some 1.25" solid brass balls with a 3/8" blind threaded holes in them on 
e-bay.  I plan to use them as safety gaps on my pole pig.  They were very 
inexpensive.  You may be able to find some too.

Have you thought about 1" or larger copper pipe caps?  They have a nice flat, 
smooth face.  Think of two short lengths of Cu pipe with a cap soldered on each 
end.  Mount the pipes in-line, so the spark gap is between the faces of two pipe 
caps.  As a bonus, if the caps become dirty or pitted over time, you could just 
rotate the pipes 180 and use the other end as an instant spare.

Cheers,

Greg




--- On Sat, 3/14/09, otmaskin5@xxxxxxx <otmaskin5@xxxxxxx> wrote:

> From: otmaskin5@xxxxxxx <otmaskin5@xxxxxxx>
> Subject: [TCML] JAVATC - Question
> To: tesla@xxxxxxxxxx
> Date: Saturday, March 14, 2009, 10:03 AM
> Bart or anyone, I have a question on the Static Gap Design
> input.? I am considering a single gap design using 2 knobs
> from cabinet doors or drawers.? The diameter accross the
> face of the knobs is 1.25".
> 
> First, should I input "round" or?"flat"
> for Electrode Geometry?? I always assumed round was used for
> copper pipe electrodes only, but now I'm not sure.? The
> face?of the knobs where the spark would?occure is
> rounded/convex - seems like I should input 'round.'?
> 
> 
> Second, how should I determine the Electrode Diameter I
> need to input?? Is is the diameter measured?across the face
> of the knob?? Or is it some calculation of diameter based on
> the radius of curvature of the rounded face of the knob??
> The former would be 1.25", but the latter would be
> considerably larger.
> 
> Thanks for your help - Dennis Hopkinton MA
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