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expy2 · 29 October 2012, 03:40 AM

Hi guys, a question for the experienced! I posted a thread earlier about the panerai 372 knocking after a full wind, my question is will this damage the impulse pin? It only does it for a few minutes, but this is surely not a good thing? And on a nearly new watch!

Rikki · 29 October 2012, 04:49 AM

Mainspring is too strong needs to be looked at. Rikki

expy2 · 29 October 2012, 06:25 AM

Seems strange.

Ironstark · 29 October 2012, 07:44 AM

Knocking on full wind on a manual wind watch is very common.
As you mentioned it stops after a while. The usual factory tolerance for knocking is that it stops knocking within a couple of hours of being fully wound!!
Remember that a manual wind watch is only right at the top of the spring for a short while. It is only fully wound once every twenty four hours.
You also mention it is fairly new. This is the amplitude of the watch with its lubricants and levels of wear at their optimum. As the months and years pass the amplitude will drop.
The calculations the manufacturer makes to determine the strength of the spring account for the variables of expected performance given viscosity of lubricants, levels of wear etc...over the years between services. Even so, if it persists then it may need to be looked at under warranty.

expy2 · 29 October 2012, 08:00 AM

First, thanks for your reply, however, can you clarify... You said that it is fairly common and that manufacturers allow for an amount of knocking, but that if it persists it should be looked at under warranty. If they allow for it what would they do under warranty? I am really surprised that manufacturers allow for this as I thought knocking would damage or loosen the impulse pin? Please understand I am not questioning you, I am just genuinely interested in this subject.
Thanks again.

Ironstark · 30 October 2012, 08:30 AM

As I said in my original response it is probable for any manual wind watch to knock for a period of time (each and every time) the watch is fully wound and is at the "top" of the spring. Remember it will only stay at the "top" for a very short time. The amplitude should normally subside fairly quickly, minutes, an hour etc...so the impulse pin should not suffer damage. The force the impulse pin is subjected to when knocking is similar to the forces it is subjected to in the escapement when it is working normally.
If it continues to do so for long enough to affect the watches accuracy etc... then it should be looked at. Usually the manufacturer will have an alternate mainspring available which is weaker, this is an easier quick fix.
Another solution would require the watchmaker to adjust the escapement to, in essence, make it less efficent and this would cause the amplitude to drop.
Many watchmakers feel this is a more legitimate soultion, but it is more involved.

29 October 2012, 03:40 AM	#1
expy2 "TRF" Member Join Date: Dec 2010 Location: England Posts: 204	Amplitude knocking/banking Hi guys, a question for the experienced! I posted a thread earlier about the panerai 372 knocking after a full wind, my question is will this damage the impulse pin? It only does it for a few minutes, but this is surely not a good thing? And on a nearly new watch!

29 October 2012, 04:49 AM	#2
Rikki TechXpert Join Date: Jun 2009 Real Name: Rik Dietel Location: Seminole Fla Watch: 5512 s/s Sub Posts: 1,818	Mainspring is too strong needs to be looked at. Rikki __________________ Century 21 Certified watchmaker Omega Service Provider Trained Omega OWME Certified. Rolex Parts Account Holder.

29 October 2012, 06:25 AM	#3
expy2 "TRF" Member Join Date: Dec 2010 Location: England Posts: 204	Too strong from the factory??? Seems strange.

29 October 2012, 08:00 AM	#5
expy2 "TRF" Member Join Date: Dec 2010 Location: England Posts: 204	Ironstark... First, thanks for your reply, however, can you clarify... You said that it is fairly common and that manufacturers allow for an amount of knocking, but that if it persists it should be looked at under warranty. If they allow for it what would they do under warranty? I am really surprised that manufacturers allow for this as I thought knocking would damage or loosen the impulse pin? Please understand I am not questioning you, I am just genuinely interested in this subject. Thanks again.

29 October 2012, 07:44 AM	#4
Ironstark TechXpert Join Date: Mar 2007 Location: Rolex world Watch: SS/W Skydweller Posts: 527	Knocking on full wind on a manual wind watch is very common. As you mentioned it stops after a while. The usual factory tolerance for knocking is that it stops knocking within a couple of hours of being fully wound!! Remember that a manual wind watch is only right at the top of the spring for a short while. It is only fully wound once every twenty four hours. You also mention it is fairly new. This is the amplitude of the watch with its lubricants and levels of wear at their optimum. As the months and years pass the amplitude will drop. The calculations the manufacturer makes to determine the strength of the spring account for the variables of expected performance given viscosity of lubricants, levels of wear etc...over the years between services. Even so, if it persists then it may need to be looked at under warranty.

30 October 2012, 08:30 AM	#6
Ironstark TechXpert Join Date: Mar 2007 Location: Rolex world Watch: SS/W Skydweller Posts: 527	As I said in my original response it is probable for any manual wind watch to knock for a period of time (each and every time) the watch is fully wound and is at the "top" of the spring. Remember it will only stay at the "top" for a very short time. The amplitude should normally subside fairly quickly, minutes, an hour etc...so the impulse pin should not suffer damage. The force the impulse pin is subjected to when knocking is similar to the forces it is subjected to in the escapement when it is working normally. If it continues to do so for long enough to affect the watches accuracy etc... then it should be looked at. Usually the manufacturer will have an alternate mainspring available which is weaker, this is an easier quick fix. Another solution would require the watchmaker to adjust the escapement to, in essence, make it less efficent and this would cause the amplitude to drop. Many watchmakers feel this is a more legitimate soultion, but it is more involved.

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