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hello guys out of curiosity I was wondering if you could make a bell
x alluminare astronomical mirrors made in casa.so that the procedure
It is carried out under vacuum,and since I have a good vacuum pump I got this idea.
I state that I do not know very well the process.
thanks to those who will respondCiao Uraniborg,
to love anything is possible if you have the right tools and knowledge, But I see mooooooolto really hard to build a bell for aluminizing homemade, that it works.
The first problem is being able to reach the vacuum pressure necessary, each pump has its pressure limit (empty) He manages to reach. If I remember correctly for this type of application you must get at least on the millibar (10-5 torr). So every minimum infiltration of air between the seals, welds, in fittings etc., not to mention the outgassing of materials, They would never allow to achieve those values.
Other real headache to solve is the construction of the steel case. Going high vacuum, The case is to be considered in all respects a pressure tank (Depression here) in which there is almost an atmosphere that tends to crush inwards. That's if the tank is not designed properly, apart from being able to break, could also only slightly deformed, that adversely affects the seals (then air infiltration). It must therefore be very rigid and well-studied.
When building components for the high vacuum is very important the quality of the welds, you should make you do by specialized firms, They do well to pay.
Finally, you know you'll build or otherwise handle an electrical apparatus, which must reach voltages of the order of 50-70000 Volt to be able to adequately vaporize the aluminum filament. With all the security issues etc. which you will of course keep account.
in conclusion, I see it as a very challenging project, only very expensive, and there would be penalties only if you plan to use it often or for work. The commercial cost, all things considered modest, does not justify the un'alluminatura, in my opinion, an investment of time and resources into a project like this.
Not that this is meant to stop, is just to expose the ones I think are the problems to be solved in order to succeed, Then if you still want to partake in the project, I will be happy to read the posts of your progress and maybe exchange ideas and opinions on the difficulties you'll encounter.
I not even know enough about the tcnologia. I can therefore only put links:
(In my working life I have had experience of casting under vacuum for the production of transformers in which it needed an isolation EHV and working in high frequency, where the vacuum only served to remove any bubbles from the casting of silicone resin).From the Stelafane link to the item Coating and aluminizing : (Where to Find us some written document, qiuindi and more easily translated the movie spoken).
http://stellafane.org/misc/links.html#Coating%20and%20Aluminizing
Then there are these:
P.S. Suspected (but I'm not sure) that for the quality of the deposit is not sufficient to a mechanical vacuum pump (ie the liquid ring type), but it also serves a diffusion in cascade to the first.
because you have been exhaustive in risposte.certo is a great undertaking
something in the mechanical portion x the small diameter could groped
especially the electrical safety would be the prince rock
not a technical experiments and attempts make me afraid
with the tensions in the game. I have a tried and tested set x groped
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