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  • in reply to: Sequence past #9282
    AvatarMarco_Girardini
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      Afferrato ;-) Thanks again!

      in reply to: Sequence past #9278
      AvatarMarco_Girardini
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        Grazie mille Mirco! Giulio, prima di tutto scusa, mi sono accorto solo ora che anche tu mi hai posto una domanda riguardo al bvcÈ un vetro stratificato prodotto in Canada se non erro ed è nato proprio per realizzare blank molto economici per ottiche dedicate allastronomia (bvc sta per black vitreous ceramic , proprio per via del suo tipico colore nero -che a quanto ne so ne rende anche più facile la lavorazione rendendo molto più evidenti eventuali difetti della superficie ma, obviously, parlo per sentito dire…-. È abbastanza raro a quanto vedo ma questo ne è un esempio http://www.astromart.com/classifieds/details.asp?classified_id=261737)

        Per quanto riguarda uno stratificato normale, per pura curiosità personaleCome mai non è utilizzabile? Per via di eventuali bolle o disomogeneità? Parlo da ignorante ma, volendo lavorare un specchio con una freccia 15/17 mm ad esempio, che assottiglierebbe in maniera eccessiva un blank da 19mm, non sarebbe possibile lavorare uno stratificato di due strati da 19mm? In tal modo lo strato sovrastante verrebbe effettivamente modellato mentre quello sottostante darebbe rigidità allo specchio, sempre senza andare a lavorare la zona di giunzione delle due lastre! O ci sono problemi di atra natura (del tipo della tempra) che ne impediscono l’utilizzo?

        in reply to: Sequence past #9260
        AvatarMarco_Girardini
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          Perfect, thank you so much! (Siete rapidissimi! :good: )

          in reply to: Sequence past #9257
          AvatarMarco_Girardini
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            tornando alla lavorazione dell’ optics: questa sera sono passato in una vetreria qui vicino per avere informazioni circa la realizzazione dei blank e mi è stato detto che, per quanto riguarda il pyrex arrivano al massimo ad uno spessore di 19mm o, alternatively, mi è stato detto che possono realizzare un blank in stratificato ma non in pyrex (mi è statod etto che il pyrex attraverso la stratificazione verrebbe temprato e quindi diverrebbe impossibile da lavorare). Le domande che ho ora sono:

            -è possibile realizzare il blank in calciosodico? se si, ha prestazioni paragonabili al pyrex?

            -se lo specchio in calciosodico è fattibile, e nel caso sia tecnicamente possibile (per la vetreria intendo) realizzare il blank stratificato, questo poi è lavorabile? la stratificazione non da luogo a tensioni interne/disomogeneità nel materiale? (ho già letto del BVC, non so se sia in qualche modo paragonabile)

            Grazie delle dritte!

            in reply to: Sequence past #9256
            AvatarMarco_Girardini
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              come non detto, mi permette di modificare solamente lultimo post

              in reply to: Sequence past #9255
              AvatarMarco_Girardini
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                And, thank you very much for the notice, you're right and I'm aware of it, in fact, I added the number only because I was unable to find private messaging within the forum and unfortunately this is also the only contact I have with mirco… I replace immediately with the email, Thanks again!

                in reply to: Sequence past #9252
                AvatarMarco_Girardini
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                  of course, for me too it will soon be difficult to find the time since I am under examination… as soon as you have time let me know so I try to organize myself! maybe we'll talk over the phone which is a little more comfortable! my number is 349——- ;-) and not to spite someone but not having the faintest idea what to do I would prefer to talk about it in person rather than in the forum, at least until I have a’ idea a little more precise on the various stages of processing (also because I am in no hurry to start given the short exams…) See you soon!

                  in reply to: Sequence past #9248
                  AvatarMarco_Girardini
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                    Thanks again for the warm welcome! It's nice to see how despite this being a very niche topic (we are already few amateurs, I dare not imagine self-made amateur astronomers…!) You can all be so active and enthusiastic!

                    in reply to: Sequence past #9246
                    AvatarMarco_Girardini
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                      hahaha but look at you! coincidence…! regarding l’ SQM seems to be all right, I did some tests comparing it with that of’ observatory of nine and has a very good answer, account to arrive at an error of 0,05 magnitudes which in my opinion for a self-built SQM is not bad…! (in the site of the link that I put you find a little something about that). Returning to the processing of optics, since I seem to understand that you have a lot of experience behind you, if you don't mind I'll take advantage of your knowledge… ;-) I have been touring this site for weeks but it is literally a world! and obviously I don't have too clear ideas on what to do… if you don't mind I would like to find us soon as soon as you have time, I have many questions! See you soon!

                      in reply to: Sequence past #9244
                      AvatarMarco_Girardini
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                        Thanks a lot maximum! Ah, good, I don't know where Mirko is from but if we are close neighbors it could be useful!
                        While we're there… Could you tell me if by chance there is some glassworks in the Vicenza area where I could find the blanks? I have already sent a couple of emails but have not received any reply… I will introduce myself there in person…!

                        in reply to: Sequence past #9242
                        AvatarMarco_Girardini
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                          in reply to: Sequence past #9241
                          AvatarMarco_Girardini
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                            Thanks a lot Mirko, that's just what I needed!
                            In response to your curiosities, I am a mechatronic engineering student from Sandrigo (Vicenza), i have a newton 250/1200 BD SkyWatcher and an 80ED SkyWatcher gold series that I usually use on an nEq6 with an Atik 314l +, plus the self-made frame I mentioned earlier (this link is from a site “secret” I'm working on where you find some details, I have yet to publish it so water in the mouth! :whistle: if you want to take a look look at the February issue 2016 again orion) then… I usually watch from my garden where despite being close to the center of Sandrigo, Luckily, it also arrives at 5,5 with the naked eye in the best evenings. And finally… Mainly astrophotography! your? (Ah, congratulations to all those who contribute to this site, it is full of information!)

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