Bill
innocent
Walk softly and carry a big stick
Posts: 8
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Post by Bill on Oct 5, 2004 13:49:51 GMT -5
dunno what gives....the last time I wore the GMT is was loosing a little every day. It chose a good time to misbehave!
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Post by Houston on Oct 5, 2004 14:06:11 GMT -5
If your're running -4 to +6 seconds your watch conforms to the COSC criteria.
It depends on how you use the watch too. When I give my Electric Blue a lot of wrist time, it ran on average +2.45 seconds over a span of ten days ( the range being between 0.5 and 4 .0 seconds over the course of the ten day period ).
Then I varied its use between 2.5 hrs daily and almost all of the daylight time. It ran consistently between +2 to +3 seconds per day and even as good as +0.5 second per day when on my wrist a lot BUT when I cut down the wrist time, the difference became +3 to +4 seconds per day.
All in all, still within the prescribed limits to be certified a chronometer. Some people are much more lucky than you and I and seem to have their +ves and -ves cancelleing out. But that's the luck of the draw I guess.
Hope you are enjoying your watch.
Best wishes
Weenson
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Post by JBHII on Oct 5, 2004 20:55:47 GMT -5
If your're running -4 to +6 seconds your watch conforms to the COSC criteria. It depends on how you use the watch too. When I give my Electric Blue a lot of wrist time, it ran on average +2.45 seconds over a span of ten days ( the range being between 0.5 and 4 .0 seconds over the course of the ten day period ). Then I varied its use between 2.5 hrs daily and almost all of the daylight time. It ran consistently between +2 to +3 seconds per day and even as good as +0.5 second per day when on my wrist a lot BUT when I cut down the wrist time, the difference became +3 to +4 seconds per day. All in all, still within the prescribed limits to be certified a chronometer. Some people are much more lucky than you and I and seem to have their +ves and -ves cancelleing out. But that's the luck of the draw I guess. Hope you are enjoying your watch. Best wishes Weenson Weenson - good point here. I've noticed my Omega's seem to do better in the accuracy department when worn. John |
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Post by Aaron on Oct 7, 2004 2:20:26 GMT -5
The more wrist time the better the accuracy.Very much noted as I have been doing the Seamaster Accuracy test for John and Day 1 was the first time the watch was worn.Since the 1st of October the watch has been worn all day and the accuracy is getting better each test day.
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Post by rkammer on Oct 14, 2004 10:42:41 GMT -5
During the accuracy test mine averaged only about 1 1/2 seconds a day but on the day that I left it in the watch box all day, it gained 5 seconds. They definitely like to be worn.
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Post by Aaron on Oct 16, 2004 17:41:51 GMT -5
Hi Ray,
After the test I gave it a days rest and mine did the same thing.It gained 5 seconds in the face up position.
I have since tested this theory several time and had the same results.
Cheers Aaron
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Post by JBHII on Oct 17, 2004 0:01:04 GMT -5
Hi Ray, After the test I gave it a days rest and mine did the same thing.It gained 5 seconds in the face up position. I have since tested this theory several time and had the same results. Cheers Aaron Convential mechanical watch theory/rule of thumb says that any automatic movement should gain more time in the dial up position. I can't remember why exactly....but that's the theory. John |
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Post by clepsydra on Oct 17, 2004 11:58:45 GMT -5
Not to be contrary, but the vertical positions will, at least in theory, present with slightly faster rates, not slower.
Here's why: In the horizontal plain (DU and DD), the watch's balance staff is seeing the least amount of friction on one pivot only while it's supported by the cap jewel, therefore providing with a full range of balance amplitude which, on a well running watch, is usually in the area of 270° to 300°.<br>
In the vertical positions (CU, CD, CL, CR), the balance staff is resting on the sides of both pivots inside the hole jewels introducing more friction to the pivots which (usually) compromises balance amplitude, sometimes bringing the amplitude down to 240° or 250° or lower (as an example).
Lower balance amplitude presents with a faster rate (shorter periods of locking/unlocking of the escape wheel), even though the theory of isochronism is supposed to negate this effect.
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Post by JBHII on Oct 17, 2004 13:42:17 GMT -5
Not to be contrary, but the vertical positions will, at least in theory, present with slightly faster rates, not slower. If by the vertical position you mean dial up, then you're not being contrary - we're in agreement that the watch should speed up in the dial up position. Thanks for that impressively detailed explaination as to why this is the case! Best, John |
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Post by clepsydra on Oct 17, 2004 21:00:16 GMT -5
When I said 'vertical positions' I'm referring to crown up, crown down, crown left, crown right; the two horizontal positions are dial up and dial down.
Theory, intuition, and physics hold that the vertical positions will present with a watch that runs a bit faster for the reasons delineated above.
Dial up and dial down should present with a somewhat slower rate
Movements that employ an overcoil balance spring are less susceptible to positional error as the balance spring remains concentric and has less of a tendency to sag under its own weight in the vertical positions.
However, as you already know, all watches will behave somewhat differently, even watches by the same maker and of the same model and serial number run. With as few as 160 parts and as many as 500, it'd be impossible to expect them to run identically.
And thanks for the compliment.
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Post by Aaron on Oct 17, 2004 22:42:39 GMT -5
There is so much to watches,that I don't know and the more I here the more I want to find out.
Cheers Aaron
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Post by MikeS on Oct 18, 2004 9:25:22 GMT -5
the surface! And Don't read John's Reviews unless your wallet is full! ;D
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SEMPER FI - THERE IS NO COMPROMISE 
