Re: Could you detail your 'fridge pump vacuum pump set up please?

Just reading the email real quick I noticed the talk about refrigeration.  I
happen to own a business doing just  that and if you have any questions
please feel free to email me.  I'll read the rest of the mail to get the
scope of what youre trying to do but I just thought I'd let you know.
-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Friday, August 27, 1999 10:13 AM
Subject: Re: Could you detail your 'fridge pump vacuum pump set up please?

>Original Poster: Terry Greene <xray-at-cstel-dot-net>
>Ok, pretty simple really. Cut lines and bend the OUTLET line pointing
>straight up. Now take a short piece of tubing that fits over the outlet
>tube and put it on. Now run down to the auto parts store and pick up one
>of those clear fuel filters that screw apart. Remove the filter element
>and put it back together. Install it on the outlet line. Now fill it
>with refrigerant oil. Might want to put another small filter of some
>sort on the outlet side of that filter housing to keep out dirt. Now run
>down to any appliance store and pick up a refrigeration service valve.
>Be sure to get the correct size as there are a few different sizes of
>lines on these things. The type I picked up was a sweat on saddle valve
>that required the end of the line to de pinched off ans soldered.
>  In operation the oil in the outlet side will keep it lubed and sealed.
>The clear filter housing acts as a nifty visual "guestimate" flow meter.
>When the oil stops bubbling, you know it has pulled all it's going to
>pull. If you need to you can always attach a real flow meter to the
>outlet side of the oil resevior/visual guage.
>  I'm told that refrigerator pumps are designed in a manner that they
>don't cool themselves all that well without freon flowing through them
>and that continuous use is not advisable. I'm also told that freezer
>pumps will stand continuous duty well because they are designed
>differently. Don't know myself, but in practice I've pumped down A\C
>systems and left my fridge pump running for hours and never had a
>problem. However, if you have the option the freezer pump might be the
>better way to go. A\C pumps like those used in home systems naturally
>move a LOT of volume, but I'm told they need freon flow for cooling
>worse than fridge pumps and are not at all well suited to continuous
>duty. Again here say. Either way, these pumps generally wind up in a
>land fill so if you don't salvage them, so you don't have much to loose
>if you toast one.
>Good luck, have fun, and be careful with those high energy toys! :-)
>davidhosking wrote:
>> Hi,
>> I saw your post on the tesla list and as I am currently thinking of
>> building a co2 laser and need a vac pump
>> i thought this might be ideal.
>> Kind regards,
>> David Hosking
>> Pharmacist,Amateur scientist, Pyrotechnician & Tesla Coiler.
>>  "Be very careful what you put into your brain
>>   because you will never get it out!"