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Breguet: A Serious Design Fault

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There is a serious problem with the stop-work in watch No. 28 and the other watch. If the barrel wheel is loose it could rotate when the watch is shaken, and then it could cause the stop-work to fail.

The following two animations show that if the barrel wheel rotates at the right time, then the finger will butt against the barrel wheel crown. As the weight is unlocked it will attempt to rotate the arbor wheel, resulting in catastrophic damage.

Animation-Breguet-No28-Winding-Finger-Fault.gif
No. 28 Winding finger fault
Animation-Breguet-Other-Winding-Finger-Fault.gif
Other Watch Winding finger fault

The first (left) animation below shows that if the barrel wheel rotates at the right time, then the crown of the arbor wheel will butt against the barrel wheel crown. As the weight is unlocked it will attempt to rotate the arbor wheel, again resulting in catastrophic damage.

The second (right) animation below shows that the fault disappears if δ = 9

Animation-Breguet-Other-Winding-Crown-Fault.gif
Other Watch Winding crown fault
Animation-Breguet-Other-Winding-Fault-D9.gif
Other watch winding with δ = 9