I've been working on a high vacuum project that should make it easy for almost anyone to copy with only basic hand tools. The links are to the fusor site where...
3715
javaguy11111
Aug 25, 2011 1:14 pm
I have been following your work there with great interest. Looking forward to seeing how well the diffusion pump works....
3716
Gomez Addams
railgap
Aug 25, 2011 5:09 pm
... Very nice work! Can't wait to see the pump-down results....
3717
miketrouba
Aug 26, 2011 7:34 am
Greetings, I was given this site by one of your fine members. I have for sale 3 one pound (poind) bottles of this oil. It was part of a lost freight sale. I...
3718
Attila
schneyolo
Sep 2, 2011 2:49 pm
Hi All, I ran into a trouble during my evaporation session. My aluminium coating doesn't pass the tape test for adhesion. My cleaning methode is: -First I...
3719
eosraptor1
Sep 2, 2011 4:15 pm
5 angstrom per second is 0.5 nanometers per second. That is 10 times to low a rate of deposition. I thought the deposition rate was supposed to be 5 to 20...
3720
miketrouba
Sep 3, 2011 5:16 am
I guess I need to end this offer. No one has sent a reply, I figured someone would be at $200 a bottle. If there is any interest, please let me know. Thanks ...
3721
Vladimir Chutko
vchutko
Sep 3, 2011 5:41 am
Hi Attila, 1. Very low evaporation rate. For Al it should be at least tens A/s. I evaporate Al on a cold substrate at 40 A/s. 2. 4x10-5 torr is not very good...
3722
trikeflight
Sep 7, 2011 9:28 pm
The specifications for several two-stage, rotary vacuum pumps list an "ultimate vacuum rating" of around 15-20 microns Hg. Has anyone come close to these...
3723
Gomez Addams
railgap
Sep 7, 2011 9:44 pm
... From my limited experience and a lot of reading, those ultimate pressures apply to a brand new pump fresh from the factory, with brand new oil of the best...
3724
trikeflight
Sep 8, 2011 1:33 pm
Thanks Gomez -- FYI, I bought a Viot 2-stage rotary vacuum pump (2.75 lpm) for some plasma experiments. To check out the pump's ultimate performance, I...
3725
Attila
schneyolo
Sep 8, 2011 7:30 pm
Hi Vladimir! Well thank you for the advises! Yesterday I increased the evaporation rate up to 230 Anström/sec(23nm/sec) The adhesion is much better, but still...
3726
Andrew Aurigema
eosraptor1
Sep 8, 2011 8:03 pm
I got one more thing to add. I have a dual diff pump with Dow 704 oil in it and a really really really tiny leak in the left pump. This puts a tiny flow of...
3727
Thomas Janstrom
t_janstrom
Sep 9, 2011 12:32 am
Have you baked the fittings sensor etc. while pumping down? Might get you a bit further down, but if it's holding vacuum then it's not going to be the magic...
3728
Thomas Janstrom
t_janstrom
Sep 9, 2011 12:40 am
HI Drew, Glad to hear you're making progress! Better get that leak sorted, have you thought about a drop of shellac to fill/seal it? Was the done thing back in...
3729
Vladimir Chutko
vchutko
Sep 9, 2011 2:46 am
Hi Attila, 230 A/s - in my opinion it is too much..... Anyway I suppose that bad local adhesion is because of a bad cleaning. If there would be oil...
3730
trikeflight
Sep 9, 2011 5:11 am
@Thomas The pump is new. Is a break-in period required before the best vacuum is reached. Right now, I only have about 2 hrs running time on it. Bruce...
3731
Attila
schneyolo
Sep 9, 2011 6:41 am
Hi ! Well, actually I even don't think if there is as an oil backstreaming,because my DP has a water cooled cold cap and water cooled cold trap too, but I had...
3732
Thomas Janstrom
t_janstrom
Sep 9, 2011 6:47 am
Yeah the pump will need to be run in, not too sure how long it will take though. I seem to remember Gomez mentioning a numbered period some time ago, but can't...
3734
Attila
schneyolo
Sep 9, 2011 7:06 am
Hi! One more thing. Before I put the new planetray system into my chamber, I had have an another where was no bearings and no lubrication. And the adhesion was...
3735
Vladimir Chutko
vchutko
Sep 9, 2011 7:07 am
Good vacuum lubricant - MoS2. The lubricant is a mix of MoS2 black powder and acetone. Bearings look very dirty but works. There are also a lot of expensive...
3736
Attila
schneyolo
Sep 9, 2011 9:38 am
Hi Vladimir! Well the graphite powder is no problem, I can make it! But how can I shield the glow discharge cathode? How big should be the area of the cathode?...
3737
Vladimir Chutko
vchutko
Sep 9, 2011 3:00 pm
Hi Attila, Please see attached paper - I done it a couple years ago for students. BR Vladimir...
3738
Attila
schneyolo
Sep 9, 2011 8:16 pm
Hi Vladimir! Thank's it looks very nice! It try these things and I let you know. BR Attila...
3739
panguane
Sep 10, 2011 1:03 am
Recently i have an order to make a vacuum furnace for composite heat treatments of composites. how much the pressure is in the vacuum chamber of furnace as...
3740
Gomez Addams
railgap
Sep 11, 2011 3:07 am
Your pump is probably back-streaming but this is where my own knowledge runs out - surely they take that into account when stating ultimate pressures?...
3741
Gomez Addams
railgap
Sep 11, 2011 3:07 am
... Most likely....
3742
Gomez Addams
railgap
Sep 11, 2011 3:22 am
... Oh boy, not from memory. And I'm sure it differs between belt drive and direct-drive due to the difference in RPMs. I could swear there was something...
3743
trikeflight
Sep 11, 2011 1:50 pm
Gomez -- The roughing pump I have been evaluating is a Viot 2-stage, 1/3 hp, direct drive pump with a displacement of 2.75 cfm. They cost about $160 new on...
3744
Andrew Aurigema
eosraptor1
Sep 13, 2011 1:36 pm
Hi all, For your consideration I submit my reasons you don't want to burn tungsten elements dry. I was trying out a new 1000 amp transformer in my vacuum ...
