Re: materials of electroddes for Neon gas tubes..

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Terry Fritz <vardin@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Ed,

Hey!  It's been 30 years since ;-))

But yes...  It did get hot, but I fixed it somehow...  I think the 
motor "start" windings were still being engaged....  Be sure to hook 
it up just like it was originally in the fridge...  It only needs the 
higher resistance "run" windings once it is started.  I had a bunch 
of switches and stiff to do it manually.  It would all go up in smoke 
now and then :D

There were three terminals... Common, start, and run...  Ohm them 
out...  The start winding was very low resistance.  It needed a motor 
start cap in there somehow too to get it going...

They do use the refrigeration fluid to carry heat out of the 
pump...  But it should not be "too" bad when doing a vacuum...

I would just use mineral oil or real vacuum pump oil in it.  Car 
stores also sell air conditioner oil.  Don't use automatic 
transmission fluid like I did unless you want to learn to love that 
smell ;-))  Mike a little oil catcher filter out of foam rubber if it 
smokes oil vapor out the back...

Cheers,

        Terry


At 04:43 PM 10/5/2005, you wrote:


>         Does your compressor get hot really fast?  I pulled a 
> rotary compressor
> out of a defunct air conditioner and while it pumps fairly well (haven't
> put a gauge on it yet but it will get down to a pressure which clearly
> shows "striations" in a discharge) it overheats in a manner of a minute
> or so.  I can extend the run by dropping the input voltage after it
> starts to just above the motor stall speed, but still no substitute for
> one of my good Welch pumps.  I did  lose some oil out of it during the
> dismantling process and I've never gotten any to replace it but doubt if
> that's the problem.
>
> Ed