Given: winding pinion 16 teeth, crown wheel 36 teeth, ratchet wheel 54 teeth, barrel 66 teeth. How many turns of the crown are required to wind the mainspring 8 turns?
The ratio of the number of revolutions is inversely proportional to the ratio of the number of teeth.
Crown wheel teeth (36) divided by winding pinion leaves (16) = 2.25
Ratchet wheel teeth (54) divided by crown wheel teeth (36) = 1.5
Therefore…
(2.25 x 1.5 = 3.375) x 8 = 27
So 27 turns of the crown will wind the mainspring 8 turns.
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