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Hawk99 · 4 January 2010, 05:37 AM

Hi All,
It's been a while since I ever really checked the accuracy of my Sub (was running +2sec/day from service 4 years ago), but recently I noticed that during an hour jog my watch gains over 20seconds.
My watch is not worn loose, and my jogging style does not put the watch through excessive pounding.
I thought the movements (1570 in my case) had technology to handle these types of shocks. What could cause this gain in time? Is a full service required? Or just a regulation?
Thanks for your insight.

Juggernaut · 4 January 2010, 07:33 AM

hmmm..my sub is running a bit slow. Maybe I'll take it with me on my next jog!

gregdolley · 4 January 2010, 10:07 AM

That's not good. You should take it in for service. It's not regulation, there's something causing the time to speed up when you jog.

Tools · 4 January 2010, 02:32 PM

There is likely nothing wrong with your watch..

The hairspring turns the balance wheel about 300 degrees of rotation for the correct amplitude and timing........

This balance wheel has three forces working on it... the mainspring torque, gravity, and centripetal force..

The last one is the biggie when you jog or put your wrist through a repetitive movement..... particularly over a long period of time...

Your arm swinging is likely countering the attempt of the spring to rotate the balance a full 300 degrees......... this reduction in amplitude quickens the locking and unlocking (tick-tocking) of the escapement.... it ticks faster..

It's like sticking your hand out the window of a car and moving it forward... if the car isn't moving you can easily move it with x force applied... put the car in motion and that same x force will not move your hand as far... The force is, of course, not wind, but rather that centripetal force of your moving arm.

Now, perhaps a stronger mainspring could counter this affect slightly.. but I don't think that I would do anything but understand it, then not worry about it....

Hawk99 · 5 January 2010, 03:09 AM

Thank you TOOLS for your detailed explanation. That makes a lot of sense.
I am glad to know whats possibly going on in there.
Regards,

Dr.B · 5 January 2010, 03:12 AM

Stop Jogging....

Hope it all goes well, listen to TOOLS, he knows.

Hawk99 · 5 January 2010, 03:31 AM

Yes I will heed the words of TOOLS. The name alone had me accepting the explanation.
But what about the Milsubs? They had the same movement (maybe older) and cannot see the military accepting a watch that could be off by 30 sec after a serious run. Just a thought.

Prince · 5 January 2010, 03:32 AM

Quote:

Originally Posted by Dr.B

Stop Jogging....

Ya beat me to it!

flatpat · 5 January 2010, 04:39 PM

I dunno. I respect Tools explanation, but 20 seconds fast for just an hour or so of just jogging doesn't seem right. Especially for a high quality watch that is adjusted for isochronism. Maybe "jog on down" to a watchmaker and see if he can throw it on his vibrograph real fast and see what its shows.

slevin kelevra · 10 January 2010, 04:07 AM

edit

ayres · 10 January 2010, 05:46 PM

interesting phenomenon... i'm a runner (though it does nothing for my waist line), and i would say it is a love/hate relationship, as i hate bringing myself to do it, but it feels so good afterward. so, i run with my rolex. i should also point out that every few months, i'll test for accuracy/consistancy throughout a week. when i owned a sub nd, i ran with it for about eight months before it began gaining five seconds on the evenings when i ran. now, your thinking, five seconds?... it's nothing. and it isn't. but my sub nd had insane skills at keeping the time - no matter what i did throughout the day.

being the scientist that i am, i began trying to duplicate the gain. i began checking my sub's time before i ran and after i ran, and sure enough... it was happening only when i ran - but not every time. other than that, it was at +1 sec/day.

why did it not gain time for all those months i ran with it? what made it suddenly begin? why did it not happen every time i ran thereafter?

being that i had other, more pressing matters - like life - i just assumed something along the lines of what larry has written above (though with much less technical sophistication) and went on with my business.

it's nice to have a more detailed explanation. cheers,

4 January 2010, 05:37 AM	#1
Hawk99 "TRF" Member Join Date: Oct 2009 Location: BC Posts: 388	1680 gains 20+ sec while jogging??????? Hi All, It's been a while since I ever really checked the accuracy of my Sub (was running +2sec/day from service 4 years ago), but recently I noticed that during an hour jog my watch gains over 20seconds. My watch is not worn loose, and my jogging style does not put the watch through excessive pounding. I thought the movements (1570 in my case) had technology to handle these types of shocks. What could cause this gain in time? Is a full service required? Or just a regulation? Thanks for your insight.

4 January 2010, 02:32 PM	#4
Tools TRF Moderator & 2024 DATE-JUST41 Patron Join Date: May 2007 Real Name: Larry Location: Mojave Desert Watch: GMT's Posts: 43,180	There is likely nothing wrong with your watch.. The hairspring turns the balance wheel about 300 degrees of rotation for the correct amplitude and timing........ This balance wheel has three forces working on it... the mainspring torque, gravity, and centripetal force.. The last one is the biggie when you jog or put your wrist through a repetitive movement..... particularly over a long period of time... Your arm swinging is likely countering the attempt of the spring to rotate the balance a full 300 degrees......... this reduction in amplitude quickens the locking and unlocking (tick-tocking) of the escapement.... it ticks faster.. It's like sticking your hand out the window of a car and moving it forward... if the car isn't moving you can easily move it with x force applied... put the car in motion and that same x force will not move your hand as far... The force is, of course, not wind, but rather that centripetal force of your moving arm. Now, perhaps a stronger mainspring could counter this affect slightly.. but I don't think that I would do anything but understand it, then not worry about it.... __________________ (Chill ... It's just a watch Forum.....) NAWCC Member

4 January 2010, 07:33 AM	#2
Juggernaut "TRF" Member Join Date: Sep 2009 Posts: 901	hmmm..my sub is running a bit slow. Maybe I'll take it with me on my next jog!

4 January 2010, 10:07 AM	#3
gregdolley Banned Join Date: Oct 2008 Real Name: Greg Dolley Location: Los Angeles Watch: Rose Gold Daytona Posts: 1,283	That's not good. You should take it in for service. It's not regulation, there's something causing the time to speed up when you jog.

5 January 2010, 03:09 AM	#5
Hawk99 "TRF" Member Join Date: Oct 2009 Location: BC Posts: 388	Thank you TOOLS for your detailed explanation. That makes a lot of sense. I am glad to know whats possibly going on in there. Regards,

5 January 2010, 03:12 AM	#6
Dr.B "TRF" Member Join Date: Nov 2008 Real Name: Fernando Location: North Carolina Watch: SS White Daytona Posts: 1,944	Stop Jogging.... Hope it all goes well, listen to TOOLS, he knows.

5 January 2010, 03:31 AM	#7
Hawk99 "TRF" Member Join Date: Oct 2009 Location: BC Posts: 388	Yes I will heed the words of TOOLS. The name alone had me accepting the explanation. But what about the Milsubs? They had the same movement (maybe older) and cannot see the military accepting a watch that could be off by 30 sec after a serious run. Just a thought.

5 January 2010, 04:39 PM	#9
flatpat Member Join Date: Jul 2008 Location: San Diego CA. Posts: 29	I dunno. I respect Tools explanation, but 20 seconds fast for just an hour or so of just jogging doesn't seem right. Especially for a high quality watch that is adjusted for isochronism. Maybe "jog on down" to a watchmaker and see if he can throw it on his vibrograph real fast and see what its shows.

10 January 2010, 04:07 AM	#10
slevin kelevra "TRF" Member Join Date: Jan 2010 Location: Scotland Watch: 14060m Posts: 631	edit

10 January 2010, 05:46 PM	#11
ayres "TRF" Member Join Date: Aug 2008 Location: honolulu Watch: whatever runs Posts: 551	interesting phenomenon... i'm a runner (though it does nothing for my waist line), and i would say it is a love/hate relationship, as i hate bringing myself to do it, but it feels so good afterward. so, i run with my rolex. i should also point out that every few months, i'll test for accuracy/consistancy throughout a week. when i owned a sub nd, i ran with it for about eight months before it began gaining five seconds on the evenings when i ran. now, your thinking, five seconds?... it's nothing. and it isn't. but my sub nd had insane skills at keeping the time - no matter what i did throughout the day. being the scientist that i am, i began trying to duplicate the gain. i began checking my sub's time before i ran and after i ran, and sure enough... it was happening only when i ran - but not every time. other than that, it was at +1 sec/day. why did it not gain time for all those months i ran with it? what made it suddenly begin? why did it not happen every time i ran thereafter? being that i had other, more pressing matters - like life - i just assumed something along the lines of what larry has written above (though with much less technical sophistication) and went on with my business. it's nice to have a more detailed explanation. cheers,

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