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Re: Rotating spark-gap materials?
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To: tesla-at-grendel.objinc-dot-com
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Subject: Re: Rotating spark-gap materials?
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From: Chuck Curran <ccurran-at-execpc-dot-com>
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Date: Thu, 29 Feb 1996 18:17:59 -0600
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Hello Kristian:
>The question is which mechanical parameters are those to look for
>in the material - tensile strenght, bulk modulus, ?? and how to
>calculate the minimum values needed. I'm not a mechanical engineer
>so I don't have the experience about this. Anybody on the list with
>knowhow on this one? I'd pretty much guess that thick bacelite disk
>would do fine..
I'm just finishing the prints for the rotary/series gap that I
plan on constructing during March. About two weeks ago I did dig
out the formula for calculating stress in a rotating flat disk.
Right now it is sitting in my bookshelf at work. I will get it and
send it to you tomorrow.
I was planning on using a 13" diameter G-10 glass epoxy disk and
ran the numbers on it. My calculation showed a stress of about 8300
psi at 10,000 RPM. I don't know if I'll ever need that speed, but
that is the worst case for the disk. G-10 material has a tensile
strength of 38,000 psi so for this situation things look O.K. I
haven't bought the material yet, so after seeing the price you got,
things may change!
Chuck Curran