Re: El Cheapo Vacuum Pumps +

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: gary350@xxxxxxxxxxxxx 

I am using the compressor from an old refrigerator.  It will pump a 
vacuum to about 28.5.   These compressors are designed to run in oil 
so after ever use I let the intake line suck up a quart of 10wt motor 
oil and pump it back into the original container.   It only takes a 
few minutes to suck a vacuum on a capacitor then back fill it with 
oil.  There is plenty of lubercation inside the pump for it to run a 
few minutes without any problems.  The same refrigertor compressor 
makes a good air compressor it will put up to about 300 psi.  I once 
pumped up an old hot water heater tank when it reached about 280 psi 
it blew up like a small atomic blast.  Good thing I used a whole roll 
of copper tubing to get the tank far away and a 250 ft roll of 14 3 
copper wire.




-----Original Message-----
>From: Tesla list <tesla@xxxxxxxxxx>
>Sent: Aug 4, 2006 11:23 PM
>To: tesla@xxxxxxxxxx
>Subject: Re: El Cheapo Vacuum Pumps
>
>Original poster: "Thomas Coyle" <zxcasd@xxxxxxxxx>
>
>For those of you in physical range of a Harbor Freight, if you're on
>their mailing list you would have received, a few days ago, a set of
>coupons, one of which offers this item for 9.99. I'm picking up a
>couple this weekend. If you want the coupon, send me your email
>address off-list and I'll forward you the email.
>
>Tom
>
>
>On 8/4/06, Tesla list <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx> wrote:
>Original poster: "Steve Ward"
><<mailto:steve.ward@xxxxxxxxx>steve.ward@xxxxxxxxx >
>
>Id be interested if i had some method of powering the pump (no air
>compressor here).  28.3" of vacuum sounds pretty good for plasma
>experiments.  The best i could ever do with my pump pulled from a
>de-humidifier was about 25-26", and that was enough to begin seeing
>some decent plasma effects when using about 20kV from an AC flyback
>transformer.  The difference between 24" and 25" of vacuum was pretty
>noticable, so id imagine 28" would be that much better.
>
>Steve
>
>On 8/4/06, Tesla list <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx> wrote:
> >Original poster: <mailto:Mddeming@xxxxxxx>Mddeming@xxxxxxx
> >
> >Hi All,
> >
> >Anyone wanting an inexpensive first stage vacuum pump that can get
> >down to 30-40 mmHg might want to consider this item from Harbor
>Freight Tools:
> >Item No. 92475
> >Central Pneumatic
> >Air Vacuum Pump with R134A Connector
> >
> >Regular Price $16.99
> >Sale Price $11.99
> >
> >Their on-line catalogue is at:
> ><
>http://www.harborfreightusa.com/usa/common/start.do>http://www.harborfreightusa.com/usa/common/start.do
> >
> >Since Tesla described a number of his experiments with partial vacuum
> >as being in the 50-150 mmHg range, this should put most experimenters
> >in the ballpark.
> >
> >Peace,
> >
> >Matt D.
> >
> >Disclaimer:
> >I have no financial or personal interest in Harbor Freight Tools, Its
> >suppliers or any associated companies, and this is not a compensated
> >endorsement.
> >
> >MDD
> >
> >
>
>
>
>
>
>