Suddenly losing 1 sec/day...issue?

[travisb]

One second????? That's not even an issue.

[OG1982]

Originally Posted by gerry100

08 Explorer II 16570, bought in March '21 with a full service form an AD.

Until a few weeks ago, I could keep the watch within 1 sec of my iPhone with the old overnight resting position trick.

Over the last few weeks I've been losing 1 sec a day despite resting face up at night.

My activity level and wear has not changed.

Something has changed but is it significant or unusual?

I think if it was significant, you'd be losing more than 1 second.

What was it running at before the old overnight trick? If the watch is consistently -1 sec p/day then it's more a regulation than a accuracy issue.

Of course, it is still well within spec and if it stayed that way I would be more than happy with a watch that performed in that way, day in and day out.

[brandrea]

Originally Posted by Harry-57

It's within Rolex spec and I wouldn't worry about it. If in doubt, get it serviced.

Exactly

[padi56]

Originally Posted by gerry100

08 Explorer II 16570, bought in March '21 with a full service form an AD.

Until a few weeks ago, I could keep the watch within 1 sec of my iPhone with the old overnight resting position trick.

Over the last few weeks I've been losing 1 sec a day despite resting face up at night.

My activity level and wear has not changed.

Something has changed but is it significant or unusual?

Hope this is a joke about 1 second difference but if its not remember there are 86400 seconds in a day. Gravity affects mechanical watches the most thats why they are tested in 5 different positions. And in those different positions there will be slight deviations almost daily in the timekeeping. Dont forget this the escapement of a mechanical watch in 24 hours pushes the gears 432,000 times. And the fact that the movement is constantly affected by the earth's gravity, metal expansion and contraction, temperature variations, mainspring power-reserve, subtle changes in lubrication and friction, shocks, and so on. The fact is that no mechanical watch made will keep perfect time, very close yes but perfect no. Just forget about the 1 second and just enjoy your watch its fine and nothing wrong.

[NachoNeal]

Maybe try experimenting with different resting positions.

[swexlin]

I understand what the OP is trying to say, as it has happened to me as well, on two Tudors, that were running +1-2 fast, until they weren't. Suddenly both started running 3-6 slow, with no change in habits.

My SD43 lately has been spot on, with light wearing and winding every other day. Except now - I set and wound it Monday morning, yester day was 1 slow, today was 2 slow, so yes, all of a sudden, became -1.

Yes, in spec. Yes, silly....but I understand what the OP is asking.

[gerry100]

Thanks for the inputs, I'll get back to update ) if I remember

[bluestreak]

The error of measurement has got to be greater than one second. I guess I see what the OP was going for, but expecting this level of precision is almost nonsensical in a mechanical watch.

The specs also are listed in terms of *average* rate of gain or loss. There is no expectation that day to day the value will be the same as it was the day before. There’s just too much variation in movement on arm, temperature, resting position, to expect it to be that consistent day to day.

[csaltphoto]

I'll add my own experience just for data. I've had my sub for about 4.5 years. Serviced right after I bought it. I wind and reset it once a week. On the average it's about +2/spd. BUT... Some weeks it's +1ish and some it's +3. I've never been able to consistently assign the variation to anything. FWIW timekeeping seems slightly more accurate when the weather is warm but I might just be more active. Timekeeping is slightly better when PR is higher so I do give it wind once a week. But yeah, it will vary a little week to week.

[Eagles4133]

I know the OP is getting ribbed on there for his question, but some guys are just sticklers for this thing and if Rolex says it should run a X seconds per day then it needs to run at that. My sub ran 1.5 SPD slow for like 2 years, then last December it decided it needed to run at 1 SPD fast. Is amplitude the reason for the flip, WTFK?

Here's a little bit of advice, consistency is much better than accuracy. I would rather have a watch that ran out of Rolex spec at +4/-4 all the time, then one that jumped from -1 to +2 to -3 to +4 to -2 over time.

[gerry100]

Not a stickler, just an old
Bored engineer trying understand a change.

Satisfied now knowing it’s not a malfunction but a not unheard of phenomena

[shedlock2000]

I think the OP is asking about the delta. Not that it happens to be running at -1spd now, but that it’s changed from its previous consistency.

I’m sorry you’re getting so much negative feedback, OP, I understand your concern.

I would say that the change depends upon how long it is since it’s last service. The change in its current accuracy, whatever it happens to be, may indicate either a slight jarring somewhere or that the oils are starting to do their job a little less well.

More info is really needed on the watch in order to give you a better answer. That it’s only just out of what it was suggests nothing serious has occurred.


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[bluestreak]

Originally Posted by shedlock2000

I think the OP is asking about the delta. Not that it happens to be running at -1spd now, but that it’s changed from its previous consistency.

I’m sorry you’re getting so much negative feedback, OP, I understand your concern.

I would say that the change depends upon how long it is since it’s last service. The change in its current accuracy, whatever it happens to be, may indicate either a slight jarring somewhere or that the oils are starting to do their job a little less well.

More info is really needed on the watch in order to give you a better answer. That it’s only just out of what it was suggests nothing serious has occurred.


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But even if he’s talking about the delta. It’s a change of *1 second*. Sometimes people expect a bit too much out of these watches


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[00Seven]

[bluestreak]

Lastly, these with companies guarantee specs based on accuracy (how close the measurement is to a given standard). As far as I know, there are no guarantees as to precision (how close the measurement is to the previous measurement). Which is what the OP is talking about.

[shedlock2000]

Originally Posted by bluestreak

But even if he’s talking about the delta. It’s a change of *1 second*. Sometimes people expect a bit too much out of these watches


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Yes, I get that — but it’s an anomaly that the OP is looking to explain.


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[996marty]

Originally Posted by padi56

Hope this is a joke about 1 second difference but if its not remember there are 86400 seconds in a day. Gravity affects mechanical watches the most thats why they are tested in 5 different positions. And in those different positions there will be slight deviations almost daily in the timekeeping. Dont forget this the escapement of a mechanical watch in 24 hours pushes the gears 432,000 times. And the fact that the movement is constantly affected by the earth's gravity, metal expansion and contraction, temperature variations, mainspring power-reserve, subtle changes in lubrication and friction, shocks, and so on. The fact is that no mechanical watch made will keep perfect time, very close yes but perfect no. Just forget about the 1 second and just enjoy your watch its fine and nothing wrong.

If this👆👆👆isn’t the perfect answer I don’t know what is. You learn something new everyday

[Gerardus]

1 second?? It is getting weirder…

[padi56]

Originally Posted by bluestreak

Lastly, these with companies guarantee specs based on accuracy (how close the measurement is to a given standard). As far as I know, there are no guarantees as to precision (how close the measurement is to the previous measurement). Which is what the OP is talking about.

Have to agree first the bare uncased movements are still tested at the Swiss COSC to a AVERAGE of -4 to +6 seconds to own the right to bare the word chronometer on the dial. And in this test the movement could vary by up to 10 seconds on any single day in the first 10 days of testing and still pass the COSC test. Now Rolex further tests on a machine with movement in its case to this new precision -2+2 test. What does this mean well in the real world at time of testing on a machine in a controlled environment at time of testing movement met the spec. Does this mean it will perform exactly the same every day for life, absolutely not as there are many variables on the wrist such as owners wearing habits, mainspring power-reserve plus many others. Much like they test cars for fuel consumption and miles, and now electric cars for range how many actually achieve there quoted figures .Not many simply because there are many variables driving basically its the same for mechanical watches.

Below test on a machine this movement test would still pass the -2+2 Rolex precision test.

Position Of Watch seconds Per Day
Dial Up +2
Dial Down -1
6 o’clock +3
9 o’clock -3
3 o’clock +5

[Big Tex Rolex]

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[kuuttingg]

Originally Posted by Locust

Better throw it away

[gerry100]

Added a little wind and reset

Rests on its back at night

Seems to be steady at < - 1 sec/day

[JJGreen]

LOL

You might be one second late for meetings and other commitments. Take that into consideration.

[gerry100]

Retired,‘don’t do meetings

[dgkula]

Dont worry about it!

[WatchTimes]

[Largoshark]

Originally Posted by gerry100

Added a little wind and reset

Rests on its back at night

Seems to be steady at < - 1 sec/day

Oh phew! I can sleep again.