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  • in reply to: Build a Telescope #12129
    AvatarFrankq_it
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      hello Giulio, happy to hear from you
      The problem with the ring is that the tool has not yet worn enough; in fact, if you look at the photo in the center you do not see the print of the dice. Is’ happened because I started with the tool from 240 then dissatisfied, I mounted the tool from 300 but it was new.
      Now I reassemble the 240, mirror below and let's get it back in order.
      I noticed that Waite created grooves in the tool between the nuts. Are needed?

      Franco

      in reply to: Build a Telescope #12124
      AvatarFrankq_it
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        Hi Massimo,
        Now I'm working with the full diameter tool. I will continue with grana 80 to switch to 120 when I'm near.
        The smallest tool is the one I used for the tests, with mirror below, then I didn't like the result I built the new tool.
        I've always worked dry, at what level water is added?

        Milling machine

        I uploaded the video to my Drive; here is the link
        Video Roughing

        Furthermore, re-measuring the mirror I realized that a ring has been created between the edge and the center, that is, the center is less deep than 2 cent/mm. how should I operate to remove it?

        Franco

        in reply to: Build a Telescope #12120
        AvatarFrankq_it
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          Hi everyone.
          Is’ almost a decade since my last post in this article; problems of all kinds have diverted my energies.
          I bought the blanks and abrasives and built a roughing machine. Most material I had accumulated over the years, as a good maker, and finally it helped.
          I built 2 tools, 300 e 240 mm diametro. I used M10 nuts and glue for outdoor tiles, two thick discs 40 mm

          I had a three-phase motor with reducer that I had purchased to motorize an antenna, I made a rotating table and an oscillating arm that moves the tool / blank
          3D printed sprockets reduce the revs of a 220V moped.

          Two weeks ago I started, it was a constant try and try again, then I put the full diameter tool underneath, the blank above and away, now I have arrived at an arrow of 3 mm, focus 1812; the spherometer measures me 30 cent / mm practically on the entire mirror, I miss the focal length F1500.
          All with grain 80! And now the problem arises. I continue with the 80th step to the 120? Still full diameter or I put the tool diameter 240, mirror above or below?

          I tried to put two photos but something is not working
          I also shot a video but I don't know how to post it on the Forum

          Franco

          Franco

          in reply to: TOT and MOT #11944
          AvatarFrankq_it
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            Ciao,
            I understand that in order to draw the optical scheme of a telescope I need to know the focuser that I'm going to mount?
            Franco

            Franco

            in reply to: TOT and MOT #11942
            AvatarFrankq_it
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              Thanks for the reply.
              Is’ It is possible to recover the distance of the secondary mirror from the primary or from the focus?

              Franco

              in reply to: Project newton compact astrophotography #11541
              AvatarFrankq_it
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                Hi everyone
                I have a 3D printer Hypercube, I built from scratch recovering the pieces from my previous printer also autocostruita. Is’ sufficiently precise and use it to build cogwheels and mechanical parts.
                Using the PLA which is high temperature softens and degrades under the sun (you have to paint it), but for use in a telescope I do not think that there are problems.
                Alternatively, the PLA is the PETG, that of bottles of mineral water, but I have not tried it yet
                For the CAD 3D I suggest Fusion 360 Autodesk. Is’ free for students and makers, just sign in Autodesk specifying who do not work for uses.
                Is’ Parametric and once obtained the solid export the .stl file for stampante3d
                As for the PC, you can find anywhere PC used reconditioned. I have two PCs a I5 and I7
                paid rispettvamente 180 e 210 €.

                Franco

                Franco

                in reply to: Foucault… "alternativo" ? #8803
                AvatarFrankq_it
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                  Ciao

                  I've used for my 300F5 6 zone e 5 on the 250, e 7 on the 360.

                  Mask with 6 zones

                  a simple threaded rod M6 (as I have always done) that the pace of a mm

                  Massimo though it used M10 that has a step 1,5 mm, each division is worth 0,015 mm
                  Why?

                  Franco

                  in reply to: Foucault… "alternativo" ? #8797
                  AvatarFrankq_it
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                    Ciao,
                    Practically I read and trawled items Grattavetro but I realize that, I become more wise It becomes more difficult to store the new information.
                    Question: For a mirror 300 F5 is a better Coudier mask 4 zone o 5?

                    Franco

                    Franco

                    in reply to: Foucault… "alternativo" ? #8788
                    AvatarFrankq_it
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                      Hi everyone,
                      I started to build the Foucault tester, and of course I would do the alternative.
                      There are information related to the building came out lately?
                      In a video on the construction of a tester, I saw that they used as a comparator I possess and that a hike of about 5 mm. But what must be able to slide the carriage back and forth?
                      The slit that makes pass the light of the LEDs should be as wide? And what must be high?
                      Franco

                      Franco

                      in reply to: Build a Telescope #8664
                      AvatarFrankq_it
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                        Ciao,
                        Very well, but what do I have to buy?
                        And for the pitch, where you buy?

                        Franco

                        in reply to: Build a Telescope #8646
                        AvatarFrankq_it
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                          Ciao,
                          this morning I'll get the glasses
                          I need to order abrasives, I recommended grain and quantity?

                          Franco

                          in reply to: #8645
                          AvatarFrankq_it
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                            Ciao,
                            capito il concetto, attrezzo il tavolo rotante per la sgrossatura, per lucidatura e parabolizzazione vediamo dopo
                            Diciamo che con l’abrasivo 400 arrivo ad avere lo specchio sgrossato. Devo affinarlo, lucidarlo e poi parabolizzare. Con quale utensile inizio? Quello di pece?
                            Dal rottamaro dove mi servo tagliano dischi di acciaio spessore 20 mm al costo di pochi euro. Posso utilizzarlo come utensile per la sgrossatura?

                            Franco

                            in reply to: #8636
                            AvatarFrankq_it
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                              Ciao,
                              mi sono rivisto il video e adesso è tutto più chiaro. Waitie sta lavorando uno specchio di 20″ that is 50 cm con un utensile di 15″ 38cm con un area di 1133 cm2. Upload the tool 60 libbre equiv 27,24 Kg con una pressione specifica di 24 g/cm2
                              Mantenendo le stesse proporzioni per uno specchio di 310 mm ho un utensile di 23 cm diametro caricato con 10 kg.
                              Praticamente la stessa macchina deve fare due funzioni diverse; la prima sgrossare il blank e portarlo alla finitura (400?) la seconda che vediamo su Astrosurf si occupa di lucidatura e parabolizzazione.
                              Macchina di Waitie: la tavola rotante và a velocità doppia rispetto alla seconda (35 g/min contro 16 g / min)
                              Question: Se mando la macchina di Waitie a 16 g/min è solo questione di tempo?
                              Dobbiamo costruire l’utensile con quadrotti di ceramica e gesso da dentisti; per il gesso nessun problema ma i quadrotti? Che tipo di ceramica? Mattonelle di Gres tagliate con il disco?
                              Nell’utensile di Waitie ci sono 170 squares, 14 its 38 cm darebbe 27 mm di lato ma si deve considerare anche le righe divisorie perciò io considererei 22 mm di lato. Chissa se esistono in commercio.

                              Macchina di Astrosurf
                              Ha due movimenti separati, l’utensile mi sembra con pece, non si parla di carico.
                              Non riesco a vedere problemi, sicuramente per la mia inesperienza-
                              Notte a tutti

                              Franco

                              in reply to: #8624
                              AvatarFrankq_it
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                                Hi everyone
                                Ho recuperato un motore monofase con riduzione 65 g/min per l’eccentrico. Devo studiare la riduzione per portarlo a 30 rounds-
                                La macchina non é automatica, basta ricordarsi di frenare casualmente o l’eccentrico o il piatto rotante.
                                Ho trovato le ruotein nylon, il piatto rotante in faggio spessore 4 cm diametro 39 cm é sufficiente?

                                Nei giorni scorsi ho letto i vs post e articoli per molare uno specchio manualmente, ma, per farlo a macchina, cosa cambia?
                                Manteniamo utensile sotto e specchio sopra? Allora ci vuole un supporto per lo specchio.
                                Rimane valido invertire sopra e sotto per riprendere la sfericità?
                                Is’ possibile che nei vari video che ho guardato ci fosse l’utensile a quadrettoni con l’abrasivo?
                                Come si mposta il tutto per fare una passata cordale?
                                Abbiate pazienza, io abitualmente gratto solo il parmigiano :good:

                                Franco

                                in reply to: #8601
                                AvatarFrankq_it
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                                  Vedo
                                  Le ruote le fanno in plastica, forse le trovo in teflon
                                  La mensola portautensile ha varie posizioni dal centro verso la periferia e può scorrere longitudinalmente sulla barra. Anche l’eccentrico é regolabile-
                                  Hai idea della velocità di rotazione dell’eccentrico?

                                  Franco

                                Viewing 15 posts - 1 through 15 (of 26 total)