Please look up the definition of a Diffusion Vacuum Pump before continuing!

This pump is made from readily available materials and has been shown to achieve a .022 TORR vacuum!!!!

Use extreme caution when working with vacuum

This pump needs a "Roughing" pump to get down to a near vacuum then it will work as described.
No a refrigerator compressor will not work as a "Roughing" Pump for this
No a vacuum cleaner will not work either!

You will need a refrigeration service type pump for the "Roughing" of the vacuum.

Yes you may have to go to IKEA to get some of the parts!

Step 1: Materials

You will need a stainless steel tube (I used an exhaust pipe section)
Some 1/4 inch copper tube and
stainless steel flat sections.

I found that the local scrap yard had lots of stainless steel parts. Selecting the right few took a couple of trips.

You will also need to know how to braze. I used stainless brazing rod for joining all parts.

I used a stainless 2.75 od exhaust pipe adapter for the body. Some scrap stainless flats for the ends.

All cutting was done with a Dremel and cut-off abrasive wheel.

Several Ikea stainless cups were sacrificed for this build!

<p>Dear bro!</p><p>Diffusion pump oil is not available <br>in my country and also I can't bear the expense in importing of DP oil. <br>Here in my country side there are a lot of silicone base oil to which i <br>can use as a low vapor pressure oil, but think is I really dont know <br>which staff has to use.in this purpose. Can you do me a favor?..... If <br>you can help me out in this project of making oil for diffusion pump. <br>And also i need help in making diffusion pump.</p>
<p>Thanks for this !!!!</p>
<p>Thank you...I finally understand how a diffusion pump works. Been looking at these awhile and scratching my head. You might link to this swf with an animated cross section of how it works on a molecular level.</p><p>http://www.edwardsvacuum.com/uploadedFiles/Resource/Corporate/About_Us/diffusion_pump.swf</p>
<p><a href="http://www.edwardsvacuum.com/uploadedFiles/Resource/Corporate/About_Us/diffusion_pump.swf" rel="nofollow">http://www.edwardsvacuum.com/uploadedFiles/Resourc...</a></p>
I'm curious what sort of torch you are using? As well as the rough total amount you ended up spending? Thanks! Very cool!
The torch is a Smith Little Torch. Quite small for this job but I used what I had. <br> <br>The Stainless metal was $1 per pound at my local scrap yard &quot;Federal Metals Calgary&quot;. The retail parts were under $10 and the tubing was purchased over 10 years ago for about $20.
I'm a bit lost. Some background, a working principle and a schematic would make this a great instructable. Also, could you explain a bit more about the construction? For example in step 6, where does the copper coil come from? It's just there all of a sudden without explanation. Thanks.
Sorry about that. I got in the zone with the build. The copper tube is a gravity feed cooling apparatus. Wrap 3-4 coils of copper tube around the body of the pump. Braze this tot he body. Water is gravity fed in a steady drip to facilitate cooling of the pump body and allow the pump to cool the heated oil.
You win a follower with this pump i am making my own but i have a question can i use 2 fridge compresors in series as a mechanical pum i know that the ideal pump is the rotary vanes one, but here in Mexico they are really expensive i know that one can get a vacuum of 100mbar
Awesome project! <br><br>Surely you can aluminize using this vaccum pump, isn't?
Thanks! <br> <br>That is definitely one of the plans!
I envy you a bit... Is there something like good envy?
Yep, called &quot;admiration&quot; and &quot;inspiration&quot;.

About This Instructable




Bio: Bit of a background in various electrical and mechanical fields, obscure sense of humour and typically willing to help...
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