How it works - my take.
In order to turn the small gear the shaft has to have a keyway (doubt this - old approach) or is machined slightly oval. Since the rotation used to tighten is less than 180 degrees (see movie) this would make sense. Once the small gear with a mating oval center is engaged by the oval shaft and begins to turn, the wedge-shaped rack moves and wedges against the oblique metal disk so that it becomes a clutch and clamps against the shaft to lock it. The screw seen at the top of this disk (on the picture) is to vary the amount of tilt and thus the clamping pressure of the disk on the shaft.
Mark http://www.sawmillcreek.org/attachme...1&d=1278944715
Last edited by Mark Koury; 07-12-2010 at 10:34 AM.
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