In addition to watch though shock, but strong impact in the outside world is easy to make the pendulumshaft tip or gear shaft broken, can make the vibration of the walking speed needle.
另外手表虽防震，但在外界的冲击力较强时易使摆轴尖或轮系轴颈折断，亦可使快慢针震动影响走时。
2
The rotating pendulum is a typical underactuated system with a rotating shaft of the motor attached to the end which is free to spin about an axis parallel to the axis of rotation of the pendulum.