Is this a Sinn thing?
So I've had my first Sinn a U50 for a few weeks now and noticed that if I leave it wound up in the watch box face up it will lose 6secs a day. If I wear the watch for a normal day (for me that's about 14hrs) it will gain about 2 to 3 secs in that period. So I find when I wear it for say a week it's pretty much spot on due to gaining in the day and losing at night. Is this just a quirk of my watch or of Sinn in general? Every other watch I own either gains or loses so found this a bit odd but great for accuracy.
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Chris
Welcome to my WatchCrunch profile.
London
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Last active: 6 months ago
7.25”
It's kind of a thing with most watches from what I can tell.
Many stories of this sort of thing here on the Crunch.
It doesn't matter enough to me to check the accuracy frequently, but there has to be a reason a timegrapher allows for testing in 6 positions.
Also, this is the exact problem a tourbillon is designed to solve.
This is why some watchmakers regulate movements in multiple positions—the accuracy often changes depending on how the watch is sitting. From what I’ve learned, it seems that many brands (aside from much higher end ones) don’t regulate the movement in the “dial up” position, because the watch rarely sits like that when you’re wearing it. Unless I’m remembering incorrectly, I’m pretty sure Marc from LIW did a Watch and Learn video about this. I’ll post it if I can find it.
It's kind of a thing with most watches from what I can tell.
Many stories of this sort of thing here on the Crunch.
It doesn't matter enough to me to check the accuracy frequently, but there has to be a reason a timegrapher allows for testing in 6 positions.
Also, this is the exact problem a tourbillon is designed to solve.
Yes I don't normally check that often as not normally wearing the same watch but been enjoying this so much since I got it that it's on most of the time atm
This is why some watchmakers regulate movements in multiple positions—the accuracy often changes depending on how the watch is sitting. From what I’ve learned, it seems that many brands (aside from much higher end ones) don’t regulate the movement in the “dial up” position, because the watch rarely sits like that when you’re wearing it. Unless I’m remembering incorrectly, I’m pretty sure Marc from LIW did a Watch and Learn video about this. I’ll post it if I can find it.
Cheers I'll have a search tomorrow when at work.
I just learned recently that the hi beat movements move so fast that the balance wheel creates a gyro effect that counteracts accuracy differences depending on which position the watch is in.
This is just how some mechanical movements are. They are heavily affected by gravity and the rate depends on the position (which is why the tourbillon exists to level that out). Your measured rates are quite good but with noticeable positional deviation, not uncommon. Note that even the tightest METAS standard (the one for large movements) allows for a maximum of 12s/day in positional rate deviation, for a movement the size of a SW300 it is even 14s/day. Quite possibly your watch would pass the accuracy test for a Master chronometer (of course the magnetism is a different matter) or fail just barely. That isn't bad at all!
What you are observing is that the watch runs slow dial up. I have an Ebel which does that so it isn't a Sinn exclusive, sorry 😜. It runs about 3s slow on average, dial up it is even slower, but dial down it gains time... so I place it dial down when going to bed 😎
This is not a Sinn or a „your watch“ thing; it happens quite often and is the desired outcome for watchmakers
This is just how some mechanical movements are. They are heavily affected by gravity and the rate depends on the position (which is why the tourbillon exists to level that out). Your measured rates are quite good but with noticeable positional deviation, not uncommon. Note that even the tightest METAS standard (the one for large movements) allows for a maximum of 12s/day in positional rate deviation, for a movement the size of a SW300 it is even 14s/day. Quite possibly your watch would pass the accuracy test for a Master chronometer (of course the magnetism is a different matter) or fail just barely. That isn't bad at all!
What you are observing is that the watch runs slow dial up. I have an Ebel which does that so it isn't a Sinn exclusive, sorry 😜. It runs about 3s slow on average, dial up it is even slower, but dial down it gains time... so I place it dial down when going to bed 😎
I'll have to try different positions over a period and see how they are. Not that I'm bothered as very happy with the time keeping but quite curious now.
I'd say to size or maybe a little smaller due to how thin it wears. I love the size on my 7.25 inch wrist and managed to get a very comfortable fit. It does make some of my 42mm watches now feel large.
I just learned recently that the hi beat movements move so fast that the balance wheel creates a gyro effect that counteracts accuracy differences depending on which position the watch is in.
Can you explain that?
Because as far as I'm aware, gyroscopic precession (the gyroscopic effect essentially) is very much tied to angular velocity / momentum. And if the balance wheel constantly changes direction, then clearly the angular momentum is clearly zero (momentum is a vector i.e. direction matters, and moving back and forth means the directions cancel out).
Therefore, the one movement the gyroscopic effect should show up in would be the Grand Seiko Spring Drive movement, because it has a glide wheel that always spins in one direction.
Can you explain that?
Because as far as I'm aware, gyroscopic precession (the gyroscopic effect essentially) is very much tied to angular velocity / momentum. And if the balance wheel constantly changes direction, then clearly the angular momentum is clearly zero (momentum is a vector i.e. direction matters, and moving back and forth means the directions cancel out).
Therefore, the one movement the gyroscopic effect should show up in would be the Grand Seiko Spring Drive movement, because it has a glide wheel that always spins in one direction.
It’s possible the YouTube video I watched was completely wrong about it. I can try to find the link.