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wrote: to OK found it :) http://www.eskimo.com/~billb/amateur/bllindx.txt just read the article know

pumping down a make and that no no i was talking about a real home made vapor diffusion pump damm i cant remember in witch magazine and what article it was :( ill try to trace that info

Were you thinking of this? http://www.sas.org/E-Bulletin/2001-12-07/features3/features.html It is a sorption pump and is useful for small things. I think it could be used very well for testing gauges

on but I think I can get the info shortly. the bottom spinning sets flat to the bottom and if memory is correct there are small notches 3 or 4 to allow the oil under it. I think the oil level is what

I was talking to a guy who was studing physics / vacuum in the 50'S at that time current thinking was that diff pumps would soon not be used anymore because other pumps were faster / eaiser etc. They

Time is a real problem right now I have way to many projects going on but I think I can get the info shortly. the bottom spinning sets flat to the bottom and if memory is correct there are small

I have been on this list for a while but have never participated. There has been some discussion re dimensions and manufacture of diff pumps. Everything I have read indicates that dimensions are not

Hi Ron, I would love some dimensions if you have the time. From what I can see of the glass design it should be simple to build in aluminium or stainless. Do the chimneys actually sit in the oil or do

Geoff Welcome, the glass pump looks real sharp It looks like a lot of work to put it together. E-bay seems to be where most of us get used stuff. The workings of most of these pumps seem to be simple

Hi I am new here, James Lerch told me about you guys. I have just finished reading the archives. Interesting and seems like a good resource. I am busy trying to find parts for a vacuum system for ATM

Bill One of the pumps I bought had a plug normaly used for 220V --I pulled the cartridge out and it was stamped 110V ---Glad I checked! if you can match the size your pump with a catalouge pump you

Have you tried calling up Alcatel? http://www.alcatelvacuum.com/all/dyn/contacts/

OK, I just bought a used diffusion pump. Inlet is about 3 inches. Outlet is about 1 inch. Height is about 12 inches. Water cooled with normally closed thermostat device on the water jacket. Since I

seal high decades enough, barrier (standard)

Now I have a handle on how diffusion pumps work would anyone be willing to post a sketch/drawing with dimensions of all the various bits. Such as how the various chimneys and baffles fit, their angles

Many times I have used old refrigerators or deep freezers as cooling plants for a variety of tasks. Find a throwaway that still works but is rusty (no value) remove all the cooling equipment in one

Temperature differential is created by m

Obviously not, (if everything is done right) since things like high vacuum capacitors and other ultra high vacuum devices work fine for decades without so much as a getter. The tricks are getting

Comments: wrote: setup trap Here's a hair-brained idea. Since once a reasonable vacuum level is achieved (1 micron or whatever it takes to start the diffusion pump) - the actual mass flow through the