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Tweed · 19 September 2010, 02:58 AM

I was wondering if the acuracy of a mechanical watch is a affected by the amount of power reserve stored inside? Thankyou for any advise.

padi56 · 19 September 2010, 03:55 AM

Quote:

Originally Posted by Tweed

I was wondering if the acuracy of a mechanical watch is a affected by the amount of power reserve stored inside? Thankyou for any advise.

Short non technical answer yes.

Watch Professor · 19 September 2010, 04:59 AM

Yes.

zillap · 19 September 2010, 05:11 AM

Quote:

Originally Posted by padi56

Short non technical answer yes.

Do you have time to tell the more technical answer? It is really interesting:)

watchmaker · 19 September 2010, 05:23 AM

As the mainspring unwinds, the amplitude gradually drops. Roughly from 300 degress at full wind, to about 230-250 at half wind. Until the watch drops below 200 degress the change in time keeping will be negligable. But as the spring continues to unwind the amps drop and drop until the balance doesnt swing at all and the watch stops. As this happens the impact of positional error on the timekeeping increases and there is an effect on the accuracy.

Strictly speaking, the better quality the watch, the less the accuracy will be affected by the spring unwiding, and this is called isochronism; which in the context of watches, means the ability to keep equal time irrespective of amplitude.

zillap · 19 September 2010, 05:34 AM

Quote:

Originally Posted by watchmaker

As the mainspring unwinds, the amplitude gradually drops. Roughly from 300 degress at full wind, to about 230-250 at half wind. Until the watch drops below 200 degress the change in time keeping will be negligable. But as the spring continues to unwind the amps drop and drop until the balance doesnt swing at all and the watch stops. As this happens the impact of positional error on the timekeeping increases and there is an effect on the accuracy.

Strictly speaking, the better quality the watch, the less the accuracy will be affected by the spring unwiding, and this is called isochronism; which in the context of watches, means the ability to keep equal time irrespective of amplitude.

I wish english was my first language. Thank you though

GradyPhilpott · 19 September 2010, 01:34 PM

Excellent explanation.

I've never seen it so concisely stated.

19 September 2010, 02:58 AM	#1
Tweed "TRF" Member Join Date: Sep 2010 Location: UK Watch: one of each Posts: 5	Accuracy I was wondering if the acuracy of a mechanical watch is a affected by the amount of power reserve stored inside? Thankyou for any advise.

19 September 2010, 01:34 PM	#7
GradyPhilpott 2024 SubLV41 Pledge Member Join Date: Sep 2008 Location: New Mexico Watch: Seiko #SRK050 Posts: 34,447	Excellent explanation. I've never seen it so concisely stated. __________________ JJ Inaugural TRF $50 Watch Challenge Winner

19 September 2010, 04:59 AM	#3
Watch Professor "TRF" Member Join Date: Oct 2009 Real Name: Myron Location: New York Watch: GMT IIC; Sub Date Posts: 3,166	Yes.

19 September 2010, 05:23 AM	#5
watchmaker TechXpert Join Date: Feb 2009 Real Name: Scott Location: London Posts: 2,242	As the mainspring unwinds, the amplitude gradually drops. Roughly from 300 degress at full wind, to about 230-250 at half wind. Until the watch drops below 200 degress the change in time keeping will be negligable. But as the spring continues to unwind the amps drop and drop until the balance doesnt swing at all and the watch stops. As this happens the impact of positional error on the timekeeping increases and there is an effect on the accuracy. Strictly speaking, the better quality the watch, the less the accuracy will be affected by the spring unwiding, and this is called isochronism; which in the context of watches, means the ability to keep equal time irrespective of amplitude.

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