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