PE-Caps, tests, and some questions

To: tesla-at-PUPMAN-dot-com
Subject: PE-Caps, tests, and some questions
From: Chris Tominkson <internetinbox-at-yahoo-dot-com> (by way of Terry Fritz <twf-at-verinet-dot-com>)
Date: Wed, 21 Apr 1999 11:51:59 -0600
Approved: twf-at-verinet-dot-com

The other day I tested some Aluminum
Flashing/Polyethelyne caps and I realized that the Al
flashing is really hard to roll, and also the
recomended 90 Mils of PE is way too much to roll with
Al flashing, and I had three other people helping me.

I calculated the caps to be .005 uF, but when rolled
they were way too low (like 7 or 8 times too low),
because of misaligned plates, air gaps, and we were
just unable to make them work. So we made the
polyethelyne 12 Mils thick, with the same plates, and
got a .0198 uF off the fluke, thats huge! And those
were very easy to roll, we probably could have got
even more with Aluminum Foil, since it could be rolled
tighter. 

But why I wrote this post is this: A lot (6+) of
smaller capacitors would be a lot easier to create,
roll, and handle than one or two big ones.

Now the question:
I just bought a Vacuum Pump, Sargent Welch Direct
Torr, model 8811. I was wondering if anybody has any
specs for this pump, or any kind of information about
it. I bought this pump for the rolled caps among other
things, and I have no expierience with vacuum pumps.
Also when does water boil in Torrs, and does anybody
know a good book or reference on vacuum pumps.

Any response would be appreciated

Chris


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