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. Si heu rebut aquest correu electrònic per error, us preguem que n’informeu al remitent i que elimineu del sistema el missatge i el material annex que pugui contenir. Gràcies per la vostra col·laboració. Este correo electrónico y sus anexos pueden contener información confidencial o legalmente protegida y está exclusivamente dirigido a la persona o entidad destinataria. Si usted no es el destinatario final o la persona encargada de recibirlo, no está autorizado a leerlo, retenerlo, modificarlo, distribuirlo, copiarlo ni a revelar su contenido. Si ha recibido este mensaje electrónico por error, le rogamos que informe al remitente y elimine del sistema el mensaje y el material anexo que pueda contener. Gracias por su colaboración. This email message and any documents attached to it may contain confidential or legally protected material and are intended solely for the use of the individual or organization to whom they are addressed. We remind you that if you are not the intended recipient of this email message or the person responsible for processing it, then you are not authorized to read, save, modify, send, copy or disclose any of its contents. If you have received this email message by mistake, we kindly ask you to inform the sender of this and to eliminate both the message and any attachments it carries from your account. Thank you for your collaboration. _______________________________________________ FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks
