With this model, the interconnection between speed and number of teeth can be derived. The number of teeth are: pinion: z=12, toothed wheels: z=24, 36 and 48 teeth. The bracket can be moved upwards by loosening a butterfly nut, with the result that the ratio of pinion and toothed wheel 1 can be demonstrated first. When the bracket has been moved down, the other speed ratios can be demonstrated.
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