[TCML] Re: Tar

[Russell L Thornton <Russell.L.Thornton@xxxxxxxx>]

Bob,
The two vacuum pumps that you mentioned will do fine and in fact more than 
you need.
They are designed to boil water in a closed system at room temperature. 
You just need
enough to pull the air out by expanding existing bubbles so they have to 
escape their
little hiding places.  If you could get the cover to seal you could, more 
than likely, get
an AC/refrigeration or sign shop to pull a vacuum for you at a price much 
less than buying
a pump that will just take up room in your shop. You could use the same 
story many use to get neon
sign transformers for free by stating this is for education 
demonstrations.  I expect they
would pull a vacuum for free, too.  They aren't out anything but a few 
watts.
Good luck with it.

Russell at the Cape
Another successful NRO satellite is now protecting our nation. Go AF!


Message: 6
Date: Tue, 20 Jan 2009 21:30:18 -0500
From: "Bob Arenella" <rja12@xxxxxxxxxxx>
Subject: Re: [TCML] Re: Tar
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Message-ID: <DF4B52B65CA646579EBADA2647A12B36@blackie>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
                 reply-type=original

Hi all,
                     Been lurking here for a good while. This subject 
brings 
up some questions about an X-Ray transformer that I'm about to put back 
together. Typical 125 KV xfmr, core strapped to brackets that are bolted 
to 
the cover. I've got new Shell Diala A oil. The xfmr has been out of oil 
for 
about 1.5 years. I'll assume I can't just put it back together, add oil & 
let 'er rip.

                     My questions are: How can I apply vacuum to this 
thing 
so there are no air pockets in the windings? I don't think the cover will 
hold vacuum. Just how much vacuum does one need to accomplish this? I see 
some small, inexpensive pumps on eBay that are rated at 3-5 CFM & will 
draw 
30" Hg. would something like that fill the bill? Would the vacuum pump 
used 
to service auto AC systems work?

                     A friend suggested heating up the core to about 140 F 
& 
just lowering it into the much cooler oil. I don't want to ruin this thing 

the first time I fire it up. Any & all suggestions greatly appreciated !!

Thank you,
Bob A
----- Original Message ----- 
From: "Russell L Thornton" <Russell.L.Thornton@xxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, January 20, 2009 9:38 AM
Subject: [TCML] Re: Tar
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