[Frameworks] technical question about modifying the shutter operation of an EIKI 16mm film projector

[Bernd Luetzeler]

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-bounces at jonasmekasfilms.com] en nom de Scott Dorsey [kludge at panix.com]
> Enviat el: dijous, 31 / juliol / 2014 15:54
> Per a: frameworks at 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
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