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Sprockets: Difference between revisions
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[[File:KS as CS sprockets (standing).JPG|right|thumb| | [[File:KS as CS sprockets (standing).JPG|right|thumb|400px]] | ||
Sprockets are toothed drums that engage with the [[perforations]] (also called '''sprocket holes''') to advance the film through the projector. | Sprockets are toothed drums that engage with the [[perforations]] (also called '''sprocket holes''') to advance the film through the projector. | ||
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===Dual-Gauge=== | ===Dual-Gauge=== | ||
[[File:Century JJ Intermittent.JPG|right|thumb| | [[File:Century JJ Intermittent.JPG|right|thumb|400px|The dual-gauge intermittent sprocket on a Century JJ, attached to the intermittent mechanism.]] | ||
Sprockets designed for [[dual-gauge projectors]] have two sets of teeth. Teeth for the larger gauge are located on the outside edge of the sprocket, while teeth for the smaller gauge are recessed in the center of the sprocket at a smaller diameter. The difference in diameter allows the film to be transported at the correct speed without adjusting the projector’s drive speed. For example, the combined intermittent sprocket for a 35/70 projector will advance 35mm film by four perforations per step while 70mm film is advanced five perforations per step. | Sprockets designed for [[dual-gauge projectors]] have two sets of teeth. Teeth for the larger gauge are located on the outside edge of the sprocket, while teeth for the smaller gauge are recessed in the center of the sprocket at a smaller diameter. The difference in diameter allows the film to be transported at the correct speed without adjusting the projector’s drive speed. For example, the combined intermittent sprocket for a 35/70 projector will advance 35mm film by four perforations per step while 70mm film is advanced five perforations per step. | ||