Patek Philippe 5470P 1/10th of a Second Monopusher Chronograph

[@buddyrupp6235]

Stunning visual

[@junileon5717]

Omg 8k video

[@gduri]

Wow

[@MagnetOnlyMotors]

2:33 those gear teeth can’t be meshing as they don’t match.

[@HighTime1]

It is indeed suprising but on another close-up I have, they do mesh. The "spring" system allows both pinion and wheel to remain in contact permanently. I'll post a more detailed article in the future with the pictures.

[@MagnetOnlyMotors]

@@HighTime1 why wouldn’t they be matching pitch? Doesn’t make gear sense.

[@HighTime1]

@@MagnetOnlyMotors Well, I won't go into too much details (and I'm not a watchmaker) but here is what I can tell. There are 4 1/10th pinion teeth between 2 clutch wheel teeth (the math should have fixed that, considering the time measurement requirements). The clutch wheel has to mesh also with the antibacklash wheel (1 rev/min, both with similar teeth size). The small 1/10 pinion (1 rev/12 sec) has to display 1/10, hence, to avoid aproximations when starting/stoping the chronograph, the teeth must be smaller. The pinion isn't bigger because of the lack of room, the 1/10th high speed, hence high inertia implied. Bigger teeth on the 1/10th pinion wouldn't be as precise (or would have led to accelerate strongly the hand's speed for a different 1/10th scale choice) or at the cost of energy consumption.

[@MagnetOnlyMotors]

@@HighTime1 sorry, I understand about gears and mixing different pitches not to mention different teeth sizes simply don’t work. I don’t get why this is done here.

[@CookieSunglasses]

poggers