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Hey anyone got Edward E02 Diffusion Pump Manual

I bought the lowest-cost pump I could find, nominally two-stage and I imagine it was intended principally for drying out automobile air-conditioning systems after a pump replacement and confess I was disappointed by the distance to absolute zero on the vacuum gauge. I checked the oil was at the high end of the sight gage and there were no leaks but still less than one or two inches of mercury was not to be has. Still, enough for a home built bell-jar and a few demonstrations with balloon, boiling water etc.

http://solusiotakcerdas.com/vauygck.php?patinacreme ++++++++++++++++++++++++++++ From: patinacreme 11/25/2015 12:02:42 PM

Just received a Veeco EP-2A with a small amount of damage to the jet stack. There's something wrong with how the top jet cap should be attached. I have photos explaining at http://www.peltier-info.com/veeco.html If you're familiar with this pump I sure would appreciate some insight into what's needed! Thanks, Steve

Interesting residue from a Sharpie or Magic Marker on a mirror that I cannot remove before aluminizing it! Here's how it happened: David C is making a 12.5" mirror and based on ronchi and foucault/couder zonal readings, it looks pretty good. We tried using a wire test, and to do so, I used a Magic Marker to draw a chord or diameter and marked some points on it. (Saw professionals at NuTek near Baltimore do the same thing, thought it couldn't hurt. We then tried to do star testing. However, trying to do that outside when uncoated was a nightmare. So I figured it would be asier if I did a quick-and-dirty coating in our Consolidated Electrodynamics vacuum chamber and alumizer, vintage mid-1960s. Literally "quick and dirty" because I didn't even wash it off. The aluminum stuck just fine, but you could see our fingerprints and the Sharpie line through the aluminum. Did some more testing. Yesterday, we decided to do a real coating. So we got out the 'green river' and the paper towels and stood outside in the snow and cold and watched Venus and Mars do their slow evening dance whille the aluminum came off, which it did. Then we took the mirror into the CCCC kitchen to clean off anything remaining (and warm up) using our regular agents: Alconox powder and powdered USP calcium carbonate (separately) with water and cotton balls. Guess what? We could still see, clearly, where I had drawn the line with the permanent marker, despite repeated washings and scrubbings. We even tried laquer thinner. No change. We haven't tried acetone, because we were out, and intend to do so, but at this point I'm not sure it will work either... Methyl Ethyl Ketone? I sure hope it doesn't need polishing again, because figuring a 12.5" mirror is a WHOLE lot of work. Weird. Anybody have comments or ideas? Guy Brandenburg, Washington, DC guysmathastro.wordpress.com http://gfbrandenburg.wordpress.com/ http://home.earthlink.net/~gfbranden/GFB_Home_Page.html ============================

Could be, Drew. I hadn't considered the heat of the aluminum at all. Won't make that mistake again.

And you said this happened after you aluminized with the shaprie marker on the glass ??? I can only guess that the 2000 deg F aluminum gas flashed the dye and you are seeing the combustion product stuck to the glass. It may only be a few atoms thick. Who knows, it may be graphine ! ! ! ! ! It sound silly but flash combustion staining can happen. My 28" f/1.05 full thickness mirror fresh back from rework went into my chamber for coating. It was precision clean upon entry. Due to the very improbable coincidence of my wife turning off the coolant water to the diff pump coolant jacket and the thermal cutoff switch not actually cutting off and there not being any oil vapor cold traps above the diff pumps.... there was a vanishingly thin ( not visible ) fog of vacuum oil in the chamber from the diff oil getting too hot. It contaminate the mirror without my knowing it. I ran the aluminization and was reduced to incoherent babbling when I opened the chamber. Upon stripping the coating with green river and cleaning with foaming dawn detergent, then calicum carbonate then cleaning and rinsing again and again, blowing a little breath fog on the mirror brought the damage out every time. Seen below is breath on the mirror acting as a fog water break. Nothing short of wiping the mirror surface down with a soft wet cloth dripping wet with very watered down jewelers rouge and distilled water remove the surface contamination. The re-coat was flawless and no hint of the contamination could be seen. Not saying this is what happened to your mirror, but that dye is carbon based and aluminum gas ( however little of it there is ) is seriously hot. Drew in rainy Florida ps..... all the things that led up to my surface getting trashed with oil have been 200% fixed. There is now dual redundant safety everything when it comes to them nasty diff pumps.

Here are some. First few after acetone. Last ones after paint strip per. Absolutely cannot see this on ronchi gram or Foucault

I believe I have eroded aluminum with plasma. The once shiny aluminum foil is now dull and pitted and missing in some places after 2 minutes of purple plasma. A bud tore apart a microwave oven and rigged me up a high voltage DC supply fed by a variac. With about 40 vac input to the microwave oven transformer, the output is about 450 vdc. The little roughing pump is pulling down to about 5 torr and the electrodes are about 10mm apart. The magnetron I ginned up is just the circular magnet from the transformer with a little N35 ( super magnet ) held at its center with an aluminum plug. I covered the magnets with aluminum foil and put the whole assembly on a plastic stand in the little degassing chamber. The magnet gets hot quick so test runs are less than 3 minutes. This is a long way from making telescope mirrors reflective but it is a start. Drew in sunny Florida

Hi, Does anyone know where I can get a large chamber like this? Is there anyone who makes such a device for a reasonable price? Regards, Peter

Anybody out there got a magnetron sputter system they want to let go for a great price ??? I have been trying thermal deposition of silicon monoxide and just can not pump enough power into the chamber without getting stuff dangerously hot. I would need the whole system, power supply and guns with shutters. Thought to ask as somebody may be getting out of the game. I want to be able to do overcoating. Drew in sunny Florida

Ok, I don't do this often, but I know where there is a complete electron microscope up for grabs, shipping for me would be a killer, but for any of our European members this might be do-able.... It's in the UK, ex-RAF. Would need a good clean and refurb (my friend runs a salvage yard), but he is trying to keep it as clean as he can. Cheers, Thomas.

Well, it looks as though the workshop is going to become a reality! Much progress has been made since my last posting and I'll keep you you up to date as progress continues. Here's a link: www.vacuumtubeworkshop.com

I can only imagine what the wife said when she saw that manly rig assembled for the first time. Some one ought to tell her, at least - you are not out drinking every night! Brian

Being a hardcore experimentalist I thought I'd test to see if this forum can still fog a mirror. (That's a metaphorical double entendre, I suppose.) Anyhow, a few months ago I designed and built a new kind of diffusion pump and thought I'd test the waters here with this link: http://www.fusor.net/board/viewtopic.php?f=10&t=9577&p=64482#p64482 The whole idea went downhill very quickly over there as far as responses go. It's hard to find much of an audience when your discussing ways to obtain higher levels of deep nothingness. My wife has suggested that I start looking into prices for a lobotomy. She thinks I'd be better company after the procedure.

I'm having the same difficulty. ;) I'm betting a lot of us are. I've been reading about fusors for many years. They look like great fun, but also a big time-sink...I don't need any more of those! -Dave -- Dave McGuire, AK4HZ New Kensington, PA

Hi, I would like to make a small oil diffusion/vapor jet pump out of st/stl. preferably a two stage pump based on an existing working design. and i was wondering if anybody here has any dimensioned drawings that i could base it on or could point me in the right direction to any books with details in. I did manage to find a few drawings online but they all seem to be for large 4" pumps Any help would be appreciated Ross

After more than a month of fiddling and hard work, the NCA ATM aluminizer is back in operation!! We got it down to 8x10^-5 torr and the coating on John P's mirror was quite presentable. Thanks again to all those who helped!! Guy Brandenburg Sent from my iPhone so full of hilarious errors... ;-€}}

This is an inspiring read. I picked up a metalization system recently, and hope to dig into it soon. I have a basic familiarity with high vacuum systems and techniques, but only basic...I'm certain I will need a lot of assistance. The system is somewhat beat-up, but it seems to be complete. I am located in the Pittsburgh area. Is there anyone nearby who might be interested in hanging out and rendering some experienced assistance? There's pizza and beer, and a large building full of really cool stuff. -Dave -- Dave McGuire, AK4HZ New Kensington, PA

Our vacuum aluminizer at the Chevy Chase Community Center's amateur telescope making workshop has given me quite an education over the past few months or so. We began finding that the pressures would not go down to the required levels for a good coating, last year -- but intermittently; sometimes it worked. (How can we tell? Discovered that unless the pressure on the Varian Cold Cathode gauge goes below about 8 or 9X 10 ^ -5 Torr, then the coating is somewhat transparent - you can see lights in back of the mirror. We were only getting it to about 1.5 x 10^-4 torr, which one would be forgiven for thin\king are not too far apart, but it was too far for success. Plus, in the Strong Procedures in Expewrimental Physics and elsewhere tab les are given for mean free path at various vacuum pressures; at 1x10^-4 torr the MFP for nitrogen at 0C is about 60 cm, or 2 feet, and that's about the distance between our filament and the mirror surface. So the gauge and the book and the mirror coatings roughly agree. By the way, the scotch-tape test shows no pull=off of aluminum in either case) Tightened up hose clamps on the rubber hoses, then found that sometimes cuts the hose! So, doubled up on clamps and don't tighten them so tight - lesson imparted, lesson learned. Also replaced hoses made by me, earlier, from auto parts store with proper thick vacuum rated hoses; David H cleaned out the mechanical vacuum pump, replaced the oil, fixed a number of unsafe electrical features. Sam C added a bleeder valve from mechanical pump and added a senson, discovered that the two of the sensor gauges were contaminated and thus giving false readings. The sensor leading to the bell jar was full of aluminum flakes and the one leading to the back of the diffusion pump was full of DP oil. Was told NOT o clean them out with compressed air because it would destroy the filament. Discovered bleeder valve itself was leaking, so soldered in two new ones in series for reliability in the line from the mechanical Sargent pump. David H removed a mechanical passthrough and examined it, began fixing it, and decided that since there was no need for it in the first place, it would be better to plug it with a plumbing part. John P discovered that the 'monnkeyshit' (technical nickname, I'm told, for Apiezon Q vacuum putty) that was keeping the home-made high-voltage passthroughs not leak, had failed. Located and ordered and received and installed new commercially made ones for about $90-120 each at Lesker, learned about 1/2 national pipe thread angles and threading facts, ordered enough O-rings (in lots of 100 each, from McMC) to keep us supplied for many lifetimes. David H tried warming up the hard wax used to make the homemade ones that Jerry S and Bob B had made many years ago that had sprung leaks; if David's method works, and the passthroughs from Lesker fail, then we have possible backups, as well as some of that monkeys##t.... Friday night, John helped clean and re-assemble and tighten and pump down the system to test it, as I was helping other folks make telescopes. It's working fairly well, but it would only go down to 1.1 x 10^-4 torr, and it needs to be into the 10^-5 torr range in my experience. I suspect we still need to outgass the entire system for quite a few hours until it's back working properly , but also that cleaning out the diffusion pump is going to be needed as well. Then rebuild the high-voltage ion plasma geneator, using our copious photographs and our carefully kept containers of parts as guidance. Without the assistance and example of Bob B, Jerry S, David H, John P, and Sam S, Mike F, Alan T, Bill R, and Bill B, and Jean-Paul R, and others, I could not have gotten as much done as we did. I'm sure I've left out a lot of steps and gotten stuff wrong, but I would like to thank all of those kind souls. Guy Brandenburg, Washington, DC http://gfbrandenburg.wordpress.com/ http://home.earthlink.net/~gfbranden/GFB_Home_Page.html ============================