... Gold will adhere to glass. I have made many "tape tight" gold coatings on quartz and Pyrex. The trick is not to get the coating too thick. All those...
Aluminum Oxide is transparent and is normally formed after a freshly aluminized mirror is exposed to air. Some coaters will introduce a pure oxygen to the...
The outside glass-face of the space capsules is/was coated with gold as a reflective coating, thin enough to see trough, is that "Glued" onto Chromium?...
James, Consider using Unistrut in a "Y" Configuration to mount your optics. Then you can adjust for ANY size optic in a few seconde. It would also be nice if...
... 20 ... in ... fold ... There is another problem. The mirror will sag under it's own weight when facing near vertical...especially with a support scheme...
I am building a 6"F5 Newtonian. I order a spyder from a well known company avertisted in S&T. Thier ad asks for the ID of the tube and the size of the minor...
Tom have you took into consideration the effect that temperture changes may have on larger mirrors? It seems to me like you would have to adjust the flex a...
Hi Bill, Well, quite literally, that is quite a stretch they expect you to do. But let's look at this for a minute. Are you expecting the vanes to fit snugly...
Spiders are built for particular sized tubes and when you use something else than that, you are in minor trouble. Typically, you either disassemble the spider...
Hello, Could you upload the pic into the photo section or provide a pointer? I'm interested in seeing this approach, but the picture did not get saved. ...
... As I understand it, flexing/pulling a sphere to a paraboloid is not done to maintain a given focal length...it's done to maintain a given figure. ...
First of all, you are doing the right thing: you should build you telescope only with components that are made by well known companies advertising in S&T....
Hello everyone, I'm new to the group. Thought you might be interested in the first truly new unique reflective system to come aound in a long time. The optical...
Peter Please understand my qualifier (NEVER TRIED IT) means I don't realy know for sure but I have heard from a good source. When I have a need to coat with...
Ken I was also thinking of the gear motor thing but I'm thinking that the gear box at vacuum may act like a slow leak and a source of contamination. I've been...
... the gear box at vacuum may act like a slow leak and a source of contamination. I've been thinking of a magnetic drive like those found on water pumps. ... ...
Hi... For those that don't know, there is a Vacuum related Group on Yahoo where these types of questions and answers are more regular than here on ATM_FREE......
... From: "Ken Hunter" <atm_ken_hunter@...> ... As soon as I get a chance, I'll see If I can "coat" a plain non-clean DC motor, and report what happens. ...
... From: "Ken Hunter" <atm_ken_hunter@...> ... As soon as I get a chance, I'll see If I can "coat" a plain non-clean DC motor, and report what happens. ...
AC clock motors do not have brushes so this isn't a problem. Electron beam can be generated in an ultra high vacuum. I supose you could consider this to be an...
Here are some professional articles on mirror supports that may be a source of ideas for us amateurs. Not every idea can be used by us (actuators, computer...
I once stumbled across a German patent for a mirror cell that used a single counterweight to balance the axial weight AND the lateral weight of the mirror....
Any Idea what I could expect to pay for a 3" thick 8" blank. Just starting to think about grinding my own mirror. Or maybe someone could lead me to a price...
... If I had a 3 inch thick blank that was 8 inch diameter, I'd cut it into 2 blanks each 1-1/2 inch thick. You really don't need to have a blank that thick...
Good Morning! I have removed the moderation for those new members who have been registered more than one week and those that have posted moderated ATM type...
