Re: strength of vacuum

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "RIAA/MPAA's Worst Nightmare" <mike.marcum-at-zoomtown-dot-com> 

Actually I was planning on encasing the secondary in acrylic tubes with 1/2"
walls and sealed with cyanoacrylate glue (actually solvent welds the
acrylic) with the topload sticking out the top.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, November 01, 2003 2:38 PM
Subject: Re: strength of vacuum


 > Original poster: Yurtle Turtle <yurtle_t-at-yahoo-dot-com>
 >
 > Of course, what good's running a Tesla coil inside a
 > solid steel vessel?
 >
 > "I know you can't see inside, but trust me, it's
 > sparkin' like mad!!!"
 >
 > Adam
 >
 >
 > --- Tesla list <tesla-at-pupman-dot-com> wrote:
 >  > Original poster: Jim Lux <jimlux-at-earthlink-dot-net>
 >  >
 >  > At 02:35 PM 10/31/2003 -0700, you wrote:
 >  > >Original poster: "Dr. Resonance"
 >  > <resonance-at-jvlnet-dot-com>
 >  > >
 >  > >The size of enclosure for TC parts in large high
 >  > vacu. would have so much
 >  > >surface area that the 15 PSI would probably crush
 >  > it.
 >  >
 >  > Nothing that a competent boiler manufacturer
 >  > couldn't make.  Big round
 >  > tanks with hemispherical ends can be easily
 >  > fabricated and will easily hold
 >  > vacuum.  The load's not all that high..  Say you
 >  > wanted a 6 foot diameter
 >  > chamber.  The hoop load would be 72 * 15 pounds per
 >  > linear inch of
 >  > chamber.. call it 1500 pounds.  If the chamber walls
 >  > were, say, 1/8" thick,
 >  > the stress would be 1500*8 psi, or 12000 psi, well
 >  > under the yield for
 >  > aluminum or steel.
 >  >   Naturally, you'd want a bit more sophisticated
 >  > design to account for
 >  > asymmetrical loads, etc.
 >  >
 >  > A bigger problem would be the surface finish and the
 >  > outgassing.  Large
 >  > chambers take a very long time to pump down (or a
 >  > very big/fast pump)
 >  > because of the large surface area.  I don't have my
 >  > Kurt J. Lesker catalog
 >  > handy here, but there's some rule of thumb about
 >  > outgassing rates per
 >  > square cm of area.
 >  >
 >  >
 >
 >