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sigguy · 8 May 2010, 01:03 AM

Have stared at pictures of 3135 movements to understand how
all the parts work together; input appreciated on the following...

I understand the concepts of mainspring slip to prevent overwinding damage
and how the bridle is needed to regulate the friction against the barrel, etc.

Does the automatic winding mechanism typically have enough torque
to fully wind and potentially overwind a watch? Not having actually
handled an automatic movement I don't have a feel for the relative
forces involved; does the rotor usually move freely against a fully
wound mainspring, or does the mainspring resist enough to stop
the rotor?

Is wear on the inside of the brass barrel ever seen or a concern?

Thanks,

Jack

CaveDiver · 8 May 2010, 01:19 AM

Hi Jack,
I’m no expert but do have a few pictures. I have no reference to compare, but maybe some of the experts and chime in on the wear patterns. This is a 1560 barrel.

Rikki · 8 May 2010, 09:34 AM

The autowinder has the power to break a mainspring if it is fixed to the barrel. They are geared down enough to overcome the strength of the mainspring. Auto springs with their bridle are designed specifically to slip at the optimum power of the spring and lose 8 to fifteen% of their power when they slip. Now depending on how the barrel was lubed with breaking grease will have a definate affect on your amplitude. Too much grease less amplitude very little and too much amplitude and overbanking or commonly called galloping because of the sound it makes. Hope that helps Rik

sigguy · 8 May 2010, 01:37 PM

Thanks for the responses.

Follow-up question; during service would one normally measure and/or
adjust bridle/spring tension? Or is that only looked at for watches
that have low power reserve/amplitude? Asking a different way, is
the bridle tension something that commonly goes out-of-whack or
is it pretty rare to have problems there?

Jack D.

Rikki · 8 May 2010, 09:57 PM

There's is no practical way to test the bridle so we just replace them with new mainsprings. There aren't enough hours in the day for certain things in our business so replacing parts with new is the most economical and best for the customer as well. Rik

Rikki · 26 May 2011, 10:36 AM

Wow didn't know I was studdering ROFL

8 May 2010, 01:03 AM	#1
sigguy "TRF" Member Join Date: Jul 2009 Location: New Mexico Watch: SeaDweller Posts: 224	automatic/overwinding questions Have stared at pictures of 3135 movements to understand how all the parts work together; input appreciated on the following... I understand the concepts of mainspring slip to prevent overwinding damage and how the bridle is needed to regulate the friction against the barrel, etc. Does the automatic winding mechanism typically have enough torque to fully wind and potentially overwind a watch? Not having actually handled an automatic movement I don't have a feel for the relative forces involved; does the rotor usually move freely against a fully wound mainspring, or does the mainspring resist enough to stop the rotor? Is wear on the inside of the brass barrel ever seen or a concern? Thanks, Jack

26 May 2011, 10:36 AM	#6
Rikki TechXpert Join Date: Jun 2009 Real Name: Rik Dietel Location: Seminole Fla Watch: 5512 s/s Sub Posts: 1,818	Wow didn't know I was studdering ROFL __________________ Century 21 Certified watchmaker Omega Service Provider Trained Omega OWME Certified. Rolex Parts Account Holder.

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8 May 2010, 01:19 AM	#2
CaveDiver "TRF" Member Join Date: Dec 2009 Location: Dallas Posts: 1,075	Hi Jack, I’m no expert but do have a few pictures. I have no reference to compare, but maybe some of the experts and chime in on the wear patterns. This is a 1560 barrel.

8 May 2010, 09:34 AM	#3
Rikki TechXpert Join Date: Jun 2009 Real Name: Rik Dietel Location: Seminole Fla Watch: 5512 s/s Sub Posts: 1,818	The autowinder has the power to break a mainspring if it is fixed to the barrel. They are geared down enough to overcome the strength of the mainspring. Auto springs with their bridle are designed specifically to slip at the optimum power of the spring and lose 8 to fifteen% of their power when they slip. Now depending on how the barrel was lubed with breaking grease will have a definate affect on your amplitude. Too much grease less amplitude very little and too much amplitude and overbanking or commonly called galloping because of the sound it makes. Hope that helps Rik

8 May 2010, 01:37 PM	#4
sigguy "TRF" Member Join Date: Jul 2009 Location: New Mexico Watch: SeaDweller Posts: 224	Thanks for the responses. Follow-up question; during service would one normally measure and/or adjust bridle/spring tension? Or is that only looked at for watches that have low power reserve/amplitude? Asking a different way, is the bridle tension something that commonly goes out-of-whack or is it pretty rare to have problems there? Jack D.

8 May 2010, 09:57 PM	#5
Rikki TechXpert Join Date: Jun 2009 Real Name: Rik Dietel Location: Seminole Fla Watch: 5512 s/s Sub Posts: 1,818	There's is no practical way to test the bridle so we just replace them with new mainsprings. There aren't enough hours in the day for certain things in our business so replacing parts with new is the most economical and best for the customer as well. Rik

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