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Problem with Speedmaster No861 moonwatch.

B
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Hi, I have a problem with my Omega, If I use the Second-hand function and forget to cancel it it runs down the system quite quickly which obviously results in the watch stopping, Is this normal or is it a fault? Regards David.
 
Dedalus05
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I would expect the power reserve to run down quicker when the chronograph is engaged compared to it not engaged, but how wuickly are we talking about?

Also, welcome to the forum.
 
Archer
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The power reserve doesn't change, so the mainspring unwinds at a constant rate no matter if the chronograph is running or not. However the watch will stop sooner with the added load, so a shorter run time of a few hours is normal.

It really depends on exactly what "quite quickly" means. When was your watch last serviced?
 
befobe
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Just a beginner question, for @Archer I guess:... If the "added load" makes a "shorter run time", why can't we say that the "power" does "change" when the chrono is on?
 
M
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As Archer explained the power reserve is the same, as the mainspring will take the exact same time to unwind.

What changes is the minimum power needed to move the hands, because, with the chronograph on, you now have more weight to move and friction to overcome each time the escapement opens. And the watch will stop, not when the power reserve is exhausted, but when it is below the new, higher, minimum needed to move the movement and the hands.

In fact, if you then disengage the chronograph, the watch will probably start running again for a while, showing clearly that the power reserve was not exhausted. It was just too low for the increased load you were putting on it, but ok for a lighter load.
 
Dan S
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B buddyboy
Hi, I have a problem with my Omega, If I use the Second-hand function and forget to cancel it it runs down the system quite quickly which obviously results in the watch stopping, Is this normal or is it a fault? Regards David.

How quickly? In other words, if you wind the watch fully, and then let it run with the chronograph going, how long does it run before stopping, approximately?
 
B
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B buddyboy
Hi, I have a problem with my Omega, If I use the Second-hand function and forget to cancel it it runs down the system quite quickly which obviously results in the watch stopping, Is this normal or is it a fault? Regards David.
Dan S Dan S
How quickly? In other words, if you wind the watch fully, and then let it run with the chronograph going, how long does it run before stopping, approximately?
Hi Dan, From a full wind at 06 00 in the morning, If I engage the second hand at 22 00 and forget to cancel the watch stops at approx' 03 00
 
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Dedalus05 Dedalus05
I would expect the power reserve to run down quicker when the chronograph is engaged compared to it not engaged, but how wuickly are we talking about?

Also, welcome to the forum.
Hi, Thanks for the reply, On a full wind and all systems engaged, The Chrono' Stops after 23 hours, The main watch carries on and stops after 52 hours, Any help? Regards David.
 
B
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Archer Archer
The power reserve doesn't change, so the mainspring unwinds at a constant rate no matter if the chronograph is running or not. However the watch will stop sooner with the added load, so a shorter run time of a few hours is normal.

It really depends on exactly what "quite quickly" means. When was your watch last serviced?
Quite some time ago, I live in Fuengirola Spain and am not sure of a qualified company around here.
 
Foo2rama
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befobe befobe
Just a beginner question, for @Archer I guess:... If the "added load" makes a "shorter run time", why can't we say that the "power" does "change" when the chrono is on?
Because the power reserve did not change, just the available torque.

So fully wind a watch and it makes it 30 hours with the chrono off

Fully wind a watch and start it with the chrono it makes it 25 hours. Turn off the chrono and it will get another 5 hours.

The issue is the mainspring in a wound down state does not have enough torque to overcome the friction of the chrono and rest of the movement. Turn off the chrono and reduce the torque needed and it can drive the rest of the movement.
 
Foo2rama
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B buddyboy
Hi, Thanks for the reply, On a full wind and all systems engaged, The Chrono' Stops after 23 hours, The main watch carries on and stops after 52 hours, Any help? Regards David.
That seems a little extreme, when was the last time the watch was serviced? Sounds like something is adding a lot of drag in the chronograph part of the movement when engaged.
 
befobe
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Foo2rama Foo2rama
Because the power reserve did not change, just the available torque."

Oooo that's smart. Thanks, perfectly clear.
 
B
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Foo2rama Foo2rama
That seems a little extreme, when was the last time the watch was serviced? Sounds like something is adding a lot of drag in the chronograph part of the movement when engaged.
Some time ago, 5 or 6 years, I live in Fuengirola Spain and am not sure of a dealership here, I'm a bit loath to mail it to UK in case it gets lost in transit.
 
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