Hi, I haven't followed the whole thread, it just came to my mind, that these people are selling variable shutter wheels for Bauer Super-8 projectors: http://www.ffr-film.de/eng-bauer-.html It's the 3rd ad "Verstellbare Flügelblende 2-3" As you can see in the picture the 3 blind have to be adjusted manually, but maybe the design can help working out something automized for the Eiki…
cheers Bernd Am 03.08.2014 um 00:40 schrieb FCO. JAVIER HURTADO MOMPEO: > Thanks Scott and everybody > (I saw a picture of a Bolex shutter, very inspiring and also the kinoton but > very expensive this redesign je) > You are right this is a redesign more tha n a modification. > But I will keep on with the main structure of the Slim Slot Load Eikie > projector because his load and drive film system allows to run the film more > fast tan 24fps and slower and also allows to make more or less radical speed > changes without damage the flm. > On the other hand yes we are using Arduino micros to control the step motors > which will move the two shutter, the main motor which runs the film and the > sprockets of the Eiki (this motor originally is an AC motor, which is really > dificult to control it) and also the light (perhaps a power led instead of > the original lamp) > I think that the main problem we have is mechanical to redesign the two > shutters there is almost no space in the box of the projector. > So we are not trying to change the speed schutter mecanically > I try to ask whether with this variable obturation to change the amount of > black or the amonut of light would produce a perceptible effect on the > projection. Because my technical partner thinks that would be the same > dinamics than to speed up or down one single shutter with the step motor. > Well we will try it and see > > > ________________________________________ > De: FrameWorks [frameworks-boun...@jonasmekasfilms.com] en nom de Scott > Dorsey [klu...@panix.com] > Enviat el: dijous, 31 / juliol / 2014 15:54 > Per a: frameworks@jonasmekasfilms.com > Tema: Re: [Frameworks] technical question about modifying the shutter > operation of an EIKI 16mm film projector > > I don't think it would be a matter of modifying it but completely > redesigning it. > > You might want to look inside a Bolex camera to see an example of how a > variable shutter works. The Bolex has two sets of shutter leaves and a > gadget that pulls them apart as a ring is moved forward and back on the > shaft. This works well, but it's not a thing you could easily fabricate > into an existing projector. > > If I were doing it, I would toss the existing projector entirely and I > would build an electronic projector from the bottom up along the lines of > the Kinoton projectors. The Kinoton has stepper motors driving the two > sprockets and a stepper motor driving the shutter, and they are all > controlled by a small microcontroller. You could do something similar > using an existing junk projector chassis and add a second shutter. It > would be fairly easy for software in the microcontroller to change the > shutter phase. > > It would seem much easier to do this than to try and implement a variable > pitch shutter entirely mechanically, and it would also make speed control > a whole lot easier. > --scott > _______________________________________________ > FrameWorks mailing list > FrameWorks@jonasmekasfilms.com > https://mailman-mail5.webfaction.com/listinfo/frameworks > > > Aquest correu electrònic i els annexos poden contenir informació confidencial > o protegida legalment i està adreçat exclusivament a la persona o entitat > destinatària. Si no sou el destinatari final o la persona encarregada de > rebre’l, no esteu autoritzat a llegir-lo, retenir-lo, modificar-lo, > distribuir-lo, copiar-lo ni a revelar-ne el contingut. 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