Mechanical Watch

Re:Mechanical Watch by justAlittleCom on Wednesday May 04, 2022 @06:38PM (#31266781)

Mechanical watch nerd here. This describe an ETA (swiss) movement, I really prefer the Japanese movement (I know mostly seikos). The mechanism are more simple and more robust. For instance, on ETA the crown mechanism is really sensitive, a lot of tiny fragile parts with a lot of tension in them, it go wrong easily.

Also, seeing this web page I got frustrated by the fact it doesn't tackle what got me the hardest time: how can the crown move the hands without any clutch mechanism (some have) ? It's a matter of friction and torque, so it's hard to get while reasoning on a "perfect" mechanism.

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Re:Mechanical Watch by rssoconnor on Thursday May 05, 2022 @11:31AM (#31274631)

It doesn't go into a lot of detail but the article does say:

> Notice that when we turn the minute wheel only the cannon pinion turns. That pinion fits tightly inside its driving gear – it usually turns with that gear. However, when the driving gear can’t rotate because it’s blocked by the rest of the gear train, the cannon pinion can overpower the friction of that tight fit and rotate on its own. This lets us set time without interfering with the gear train, which could break the delicate parts.

Personally, I was wondering how one can wind the watch from the crown without engaging the weight of the autowinding mechanism. I'm guessing that winding with the crown causes the ratchet to slip on both pairs of blue/yellow gears.

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Re:Mechanical Watch by elSidCampeador on Wednesday May 04, 2022 @11:40PM (#31269141)

Hi where can I learn more about the Japanese movements?

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Re:Mechanical Watch by ngcc_hk on Friday May 06, 2022 @07:31AM (#31283891)

In fact the issue do not change the time around 12 is a bit of mystery to me. Is that applied to all mechanical watch or just European ?

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