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Re: Cleaning/Repairing Edwards E2M5

Posted: Thu Feb 14, 2019 6:20 pm
by Richard Hull
10 or even 15 microns is about the best one can ever hope for on a used pump. and will perform flawlessly using a diff pump or turbo. Short of a rebuild I would not expect much better. You have done the best that might be expected for a used pump. From my point of view, you are good to go for use in a real fusor. Even with the oil as is, you have a fine pump.

Richard Hull

Re: Cleaning/Repairing Edwards E2M5

Posted: Mon Mar 25, 2019 8:14 pm
by Ameen Aydan

Bruce Meagher gave me his gauge to use and test and it’s giving the exact same results. 25 torr and that’s the max. My gauge reads 35 torr so I do need to calibrate slightly. Does anyone know if it is bad if I don''t calibrate? This clearly shows that there is nothing wrong with my gauge.

He did give me an intake flange but it was too big. Does anyone have one the are willing to lend me for a month or two? Email me thank you

These results are still using the Teflon seal. Because I got 13 micron last try then it seems that my problem is the inlet not being secure enough. I doubt that my pump would be doing something wrong if I previously got anything a good result...

An inlet should do the job

Ameen Aydan

Re: Cleaning/Repairing Edwards E2M5

Posted: Tue Mar 26, 2019 1:57 am
by John Futter
Get rid of the teflon tape
use loctite 569 Hydrulic sealant (thickliquid) or Loctite 290 (superwickin)
Teflon tape is for plumbing of water systems not high vacuum

Re: Cleaning/Repairing Edwards E2M5

Posted: Thu Sep 26, 2019 1:39 am
by Ameen Aydan
Would JB weld do the same?

Re: Cleaning/Repairing Edwards E2M5

Posted: Thu Sep 26, 2019 8:12 am
by Rex Allers
Can you give us a pic of what you plan to connect to what?

I love JB Weld for connecting things that have vacuum down to 1 micron or a bit less. But where I have used it is to permanently connect pieces. It is not wise for something threaded you may ever want to unscrew.

Last discussed, I think it was sealing threads. Not a job for JB Weld unless you never want the option to undo it.

Assuming you are still trying to evaluate your pump's capability, give us that pic of how you will connect pump to your gauge.