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Thanks for the suggestions. The coater I have was given to me by Bill Pollack who has posted here before as Arcstarter. It was originally used for coating quarts crystals used in electronic

Roger, This is not unusual at all. Nickel is very aggressive to the refractory metals at elevated temperatures. Copper and silver are not. The only issue with silver is that it does not wet tungsten

Roger, that's a pretty good vacuum, IMO, not that I'm any kind of expert. Why are you attempting to coat with copper? What is it like when you use silver? Guy Brandenburg, Washington, DC? My blog,

I'm kind of new to this stuff. so far I have successfully coated with copper and silver but If I try nickle in a tungsten boat, the bottom just gets melted out of the boat. Everything I have read

I like that. Aluminum-coated gas atoms! If you get a whole bunch of those together, you could have a massively-multiple-mirror telescope (as in 6 x 10^23 mirrors, if you order 1 mole's worth) weighing

Nah, the storms were well north of me, like 500miles or so north, got a little windy, but not storm windy. Had hoped to get some rain I mean we’re only 70mm short of 1m* for the year to date! LOL

Thomas, Hope the storms I saw on the world news were not over your place. Looked bad for northern area. You saw the emitters for my system. I do get coating coverage on the mirror surface with each

Molten aluminum is a “getter” so as it melts and volatilises it will actually drive the strength of the vacuum up, so your only really coating with the last couple of emitters. Sometimes more is

Interesting method! Guy Brandenburg, Washington, DC? My blog, mostly on Education in DC: http://gfbrandenburg.wordpress.com/ My home page on astronomy, mathematics, education:

Yea……. but there is a lot of them little guys so if the first few to hit the beach don’t make it, well the next 10e20 of them might. The vacuum gets harder with each set of emitters I run. There

That does sound a bit high; I think the mean free path of the aluminum atoms would only be about 8 inches. Guy Brandenburg, Washington, DC? My blog, mostly on Education in DC:

I am going to say 2.5 x 10-4 torr. Seems too high but that is what my last cold cath meter said. Sent: Monday, March 22, 2010 5:46 PM To: VacuumX@... Subject: RE: [VacuumX] record time How

How much is pumping pressure for you? Guy Brandenburg, Washington, DC? My blog, mostly on Education in DC: http://gfbrandenburg.wordpress.com/ My home page on astronomy, mathematics, education:

Sweet. I cant quite brag on time as it takes 6 hours to pump Baby George down to coating pressure, but I did use a vintage 1970' XMS-1 to automatically put exactly 124.0 nm of aluminum on an old 4"

Hi! I think it is World Record :) Congrat! Attila The Hun

I may have set a record tonight. I started washing a previously stripped mirror at about 7 PM. By 7:40 it was in the vacuum chamber; evewntually got the pressure down to about 7x10^-5 torr. By 8:45 pm

Hi guys, The pending sale of my 8 inch diffusion pump and the Welch 1397 mechanical pump fell through due to shipping costs to California so I have posted photo's of them in a new "For Sale" album on

OK, no problemo! Ken

Ken,It turns out that what I have on hand is about what you are selling (the DuoSeal). So I will need to decline to purchase another one. Guy Brandenburg, Washington, DC? My blog, mostly on Education

Seems my memory may be playing tricks with me? I didn't find, at least within that 60 foot circle, my G/P vacuum controller. I may have slipped it into one of the crates buried at the bottom of my