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New Speedmaster pro, running a bit slow, question about accuracy range of speedy

Archer
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Mouse_at_Large Mouse_at_Large
Maybe it's just my brain that is getting old, but wrt pendulums, I thought that the amplitude (unless very small or large) did not affect the frequency which is a function of the length of the pendulum. For example as explained here https://sciencing.com/affects-swing-rate-pendulum-8113160.html 😒

To be clear, I used the pendulum example because it's easier for people to visualize than a balance wheel. As has already been noted, the swing of a clock pendulum is very small, and a balance by comparison is very large. Balance amplitudes of 300 degrees are not uncommon (in each direction) so total travel of the balance wheel in one complete cycle can be 600 degrees or more.
 
zeiter
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Archer Archer
No, and no. This is getting into the weeds a bit, but with watches equipped with regulators that act on the balance spring like the 1861 has, the amount of movement of the regulator for a given change in timekeeping is variable, and depends in part on the spacing of the regulator pins on that specific watch.

If the regulator pins are spaced very wide, then a given movement of the regulator will have less impact on the rate then if the regulating pins are spaced very closely together. The spacing of those pins is determined through the positional adjustment portion of the timing process.

Cheers, Al

Al,

Thanks for this information.

Can you clarify: The regulating pins can be adjusted along with the regulator position, if necessary, in order to lessen the effect of very minor regulator movement - is this (roughly) correct?

Great info, as always.
 
Archer
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zeiter wake_me_@_180
Al,

Thanks for this information.

Can you clarify: The regulating pins can be adjusted along with the regulator position, if necessary, in order to lessen the effect of very minor regulator movement - is this (roughly) correct?

Great info, as always.

Regulating pins would not be adjusted for this reason, but yes theoretically they could be.

There is no reason to adjust the sensitivity of the regulator movement, so it seems the comment made to you may have created a concern where there really isn’t one.

Cheers, Al
 
zeiter
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Archer Archer
Regulating pins would not be adjusted for this reason, but yes theoretically they could be.

There is no reason to adjust the sensitivity of the regulator movement, so it seems the comment made to you may have created a concern where there really isn’t one.

Cheers, Al

Al,

Some great online images just helped to demonstrate what you’ve explained. And, you are quite correct regarding my interpretation (erroneous) of the watchmaker’s comment.


I really appreciate this.

180
 
Foo2rama
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At least we don’t have to discuss how running the chronograph does and does not make a wound watch stop faster.

::stirthepot::
 
Archer
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Foo2rama Foo2rama
At least we don’t have to discuss how running the chronograph does and does not make a wound watch stop faster.

::stirthepot::

Not in this thread anyway...
 
D
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painquotidien painquotidien
I have a new Speedmaster pro, I am a very new forum member, and I have a question about accuracy.

My new speedy loses about 4s a day. I just wanted to ask two things

1) why Omega has a target of -1/+12s why the range is not symmetrical in relation to 0?
2) is -4s a day acceptable, I understand that it is essentially out of the range but would it be reasonable for me to get it back to Omega?

Obligatory photo attached
If you need accurate time keeper then a quartz watch is the answer. +/- 0.5 second /day
 
gostang9
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Foo2rama Foo2rama
At least we don’t have to discuss how running the chronograph does and does not make a wound watch stop faster.

::stirthepot::
Doesn’t it? 😵‍💫 👎 😉
 
Foo2rama
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gostang9 gostang9
Doesn’t it? 😵‍💫 👎 😉
Yes and no. 😀 Generally yes, but not why or how many people would immediately think. But my friend you know that. 😉
 
gostang9
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Foo2rama Foo2rama
Yes and no. 😀 Generally yes, but not why or how many people would immediately think. But my friend you know that. 😉
Oh, I have been edumacated on this misconpercepcion before.... I have a paper at home where I wrote 100x:

Chronograph running will not make my Speedmaster run slower!!
Chronograph running will not make my Speedmaster run slower!!
Chronograph running will not make my Speedmaster run slower!!
Chronograph running will not make my Speedmaster run slower!!
Chronograph running will not make my Speedmaster run slower!!
...

I still don’t quite comprehend it, but I do accept it for fear of further humiliation. 😉
 
Foo2rama
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gostang9 gostang9
Oh, I have been edumacated on this misconpercepcion before.... I have a paper at home where I wrote 100x:

Chronograph running will not make my Speedmaster run slower!!
Chronograph running will not make my Speedmaster run slower!!
Chronograph running will not make my Speedmaster run slower!!
Chronograph running will not make my Speedmaster run slower!!
Chronograph running will not make my Speedmaster run slower!!
...

I still don’t quite comprehend it, but I do accept it for fear of further humiliation. 😉

Watch is driven by the unwinding of the mainspring. Running the chrono does not deplete the mainspring faster, as the mainspring unwinds each tick. But when the mainspring is unwound it has less torque and running the chrono requires more torque then just the normal operation. So it can stop faster but stopping the chrono will sometimes make the watch start again.

It's a layman’s answer which I am sure is slightly wrong in terminology somewhere.
Edited:
 
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