Seasonal variation

[Rock]

Because I am retired and have time to do stuff like this, I monitor the two watches I wear daily (alternately not together!) each day using the online time-service 'Timeanddate.com'.
I had observed over the years that the DJ is consistently more accurate in Summer and the Sub in the Winter - by about 1-2 secs gain daily.
We have just had a 'cold-snap' here (daily lows <50 F.) which is unusual in this neck of the woods and only seen occasionally in my lifetime.
I was intrigued to see the DJ daily average jump from it's usual 3 - 4 secs to 5 & 6 secs on the two coldest days. The Sub is loving it however and it's daily average has dropped from it's usual 5 - 6 secs to 3 - 4 secs on the same days.
I wonder if anyone else observes this phenomenon.

[DCheeta]

Hahaha, man I wish I had time, I’d be doing stuff like that too! When I retire...

That’s a pretty interesting observation. I see that your Sub is a 14060M and has a cal 3130, and I assume your DJ has a 3135. That makes it even more interesting as the movevents are almost the same, architecturally. Maybe it comes down to a variation in the lubricants. I hope a watchmaker sees this thread and sheds some light.

[padi56]

Originally Posted by Rock

Because I am retired and have time to do stuff like this, I monitor the two watches I wear daily (alternately not together!) each day using the online time-service 'Timeanddate.com'.
I had observed over the years that the DJ is consistently more accurate in Summer and the Sub in the Winter - by about 1-2 secs gain daily.
We have just had a 'cold-snap' here (daily lows <50 F.) which is unusual in this neck of the woods and only seen occasionally in my lifetime.
I was intrigued to see the DJ daily average jump from it's usual 3 - 4 secs to 5 & 6 secs on the two coldest days. The Sub is loving it however and it's daily average has dropped from it's usual 5 - 6 secs to 3 - 4 secs on the same days.
I wonder if anyone else observes this phenomenon.

Many things effect all mechanical watches such as gravity, metal expansion and contraction,different temperature variations,mainspring power-reserve, subtle changes in lubrication and friction, shocks, and so on.

[Andad]

Originally Posted by padi56

Many things effect all mechanical watches such as gravity, metal expansion and contraction,different temperature variations,mainspring power-reserve, subtle changes in lubrication and friction, shocks, and so on.

I agree, I slow down when it gets cold Peter.

[Yess]

I think power reserve is crucial. I'd assume a fully wound watch would keep the most accurate time.
I've found a watch I wear 12 hours+ a day keeps exceptionally good time. If I don't wear it all day, it's all over the shop!

[18078pres]

How could those mild temp changes effect a watch when its worn ? On the wrist its going to stay close to your body temp. Or are you talking being stored ? Ether way I never seen that behavior in my watches.

[Rolex-istanbul]

Originally Posted by padi56

Many things effect all mechanical watches such as gravity, metal expansion and contraction,different temperature variations,mainspring power-reserve, subtle changes in lubrication and friction, shocks, and so on.

Every accuracy topic, my friend you telling the same.

Accuracy can be controlled, i am controlling it.

You need to learn the watches behaviour and try to establish a lifestyle to optain the desired accuracy.

My watch is +2 second in 2 years now. Not daily its 2 years 2 second fast.

How did i do it? i learned my watch for the first 3 months. what makes it go fast andwhat makes it go slow.

In what rate? everything i learned and now i am happy to say that i optained this accuracy on a mechanical watch.

what did i sacrifice for this accuracy?

My Marriage, my personal life. I got no hobbies now. i sleep at 21 00 wake up 5 00.

every day i walk 15kms so i am thinner.

This is dedication an no one can beat me o this.

[Rock]

Originally Posted by 18078pres

How could those mild temp changes effect a watch when its worn ? On the wrist its going to stay close to your body temp. Or are you talking being stored ? Ether way I never seen that behavior in my watches.

I did wonder about the "body temp" variable myself.
Each watch is on the wrist for only about 12 hours in every 48 and on the winder for the rest (actually winding for only 12 hrs of the 36)
You'd never notice the phenomenon unless you were monitoring it daily AND recording the results AND then glancing over the results across several years.

[padi56]

Originally Posted by 18078pres

How could those mild temp changes effect a watch when its worn ? On the wrist its going to stay close to your body temp. Or are you talking being stored ? Ether way I never seen that behavior in my watches.

Why do they think they test all the movements at the COSC to get the chronometer certification, at 5 different temperatures and positions.