Calculate the vibrations for a watch with the following: barrel 120 teeth, centre wheel 80 teeth, centre pinion 12 leaves, third wheel 75 teeth, third pinion 10 leaves, fourth wheel 70 teeth, fourth pinion 10 leaves, escape wheel 15 teeth, escape wheel pinion 7 leaves, number of turns of barrel 7.
Vh = Z1•Z3•Z5•(2Ze) = N1
Z2•Z4•Z6
Vh = 80•75•70•(2 x 15) = 18,000
10•10•7
Clue: If there are 15 teeth on the escape wheel, the answer will either be 18,000 or 21, 600. If there are 20 teeth on the escape wheel, the answer will be either 28,000 or 36,000.
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