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Thomas, Inconel, Chromium, Titanium, Nickel are the materials that usually used for neutral density filters deposition. However if you like just to add partially transparent mirror on a thin

Hi Drew, I thought that SIO had to be evaporated verticaly! From my (limited) understanding SIO melted into a pool and then evaporated upwards. Can you enlighten me? Regards, Alfredo

Hi All, I've placed some more links to patents on E-Guns, but I was wondering if any other member that has pratical experience with these could help me (and others) with some more detailed info or

Hi Thomas, Last time I wanted to make a solar filter, someone on the list suggested that I evaporate nickel-cronium wire used for heating and it worked nicely. Regards, Alfredo

Hi Zafar, I meant is to say is that I included the link in the links section of this group. But here is the link:

Ken, Yes I did use the ramp control. 2 minutes of 30% then 2 minutes of 60% then 90% till 1.37 kA were achieved. But my grounding problem prevented me from getting any real power to the baffle box.

Vladimir, thanks for the reply, any info will be appreciated. I was under the impression that solar filters made of coated Mylar use aluminium, but I may be totally wrong. At least some of the coated

Dear Alfredo I will interested in the patent you mentioned. Kindly send me the reference zafar To: VacuumX@... From: aneves@... Date: Tue, 24 Aug 2010 01:45:00 +0000 Subject:

Hi All, I've been interrested in learning about E-Gun evaporators and have added a link to a patent that describes such an E-Gun for those interrested. Regards, Alfredo

Thomas, Al with thickness > 80 -100 nm doesn't transmit visible light. If you will, tomorrow I can give you data for thicknesses from 0 to 80 nm. However Al is not used for neutral density filters -

Hello, I've been lurking here for quite some time. I haven't got the space to build myself a vacuum system, but that certainly doesn't keep me from dreaming. And this post really caught my eye. Does

Does anyone have any information on a Dynavac CS300 Coating Unit - or know where I might get some information ? It uses an ULVAC diffusion pump. ULK-04 (B1) When I originally acquired the unit, the

Ted and Peter, Thank you for the information and the reference. I never did like to use a formula blindly without knowing it's precedence. Best Regards, Alfredo

Hi Alfredo, If you can get your hands on "Rourke's(or Roark,s) Formulas for Stress and Strain", under formulas for elastic stability of plates and shells, you should find a formula for thin tubes

Drew... Expensive those little springs... Did you use the electronic controller to ramp up and down the current? I used it to control a lamp but not an evap system myself. Wondering how that worked

On the collapsing pressure of cylinders subjected to external pressure. At one stage I was very interested in cylinders which would withstand being immersed to 1000 m depth in the ocean. So I tried to

Ken, I opened the little crystal holder yesterday to see what was in there that made it so expensive. Aside from them spring clips holding the crystal holder in place it did not look all that exotic.

Hi Well I have two chambers the smaller is 15,7 " in diam wall thickness is 3mm. That was a air tank of a compressor. It is steel, I could make 1x10-4 torr vaccum inside, so it works. I don't want to

well, I don't understand that formula.... If I have 0.5" wall thickness and 16" diameter, t^2/D^2 = 0.25/256, and 1- 1600(t^2/D^2) = -0.5625, i.e for all t/d>1/40 we'll obtain a square root from

Hi Attila, I've been looking all over for such a formula! Thanks. So if I use: t = 0.125" d = 16" I get 50 pounds/inch Which means that if I have a bell shaped stainless steel chamber with 1/8" wall