Seth thomas ship clock with external bell running too fast

eteo66

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Mar 31, 2008
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Hi,

I have the above clock. It is running too fast even though I have set the S-F setting all the way to slow. I have not worked on this type of clock before so can someone point me in the right direction? A book dealing with this clock would also be useful. Thanks!
 

eskmill

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Most likely the balance spring (hairspring) is either magnetized or has one or more spirals cohereing (sticking together) due to magnetism or oil.

Other causes: balance spring pinned too short; wrong balance spring; regulator pins too close and not allowing balance spring to "breathe."
 

eteo66

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Mar 31, 2008
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Thanks Ekmill. How shall I go about repairing this? Is there a reference book for this type of movement? Thanks once again.
 

shutterbug

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eteo66 said:
Thanks Ekmill. How shall I go about repairing this? Is there a reference book for this type of movement? Thanks once again.
I'm butting in, but first you need to determine which of the problems Les described is causing the problem. Check for magnetism with a compass, then come back with the results. We can start eliminating possibilities then :)
 

Cactus50

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The usual cause of this condition is a dirty works. Reduced power from the time train produces a low amplitude rotation of the balance wheel - which makes it run faster. The cure is simply to clean the movement and platform, paying close attention to the pivots and pivot holes for wear. Do not start by trying to "adjust" the platform.
 

eteo66

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Mar 31, 2008
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hi thanks but is there a book i can refer to? I have only worked on pendulum clocks before. I think this is a seth thomas no. 7 movement.
 

Tony Ambruso

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Yes, eteo, there is a book you can refer to for a S.T. no. 7. Steven Conover's "Striking Clock Repair Guide," page 69. You can obtain this book from many places, including the NAWCC gift shop, various horological suppliers (like Merritt's or TimeSavers); or you can visit the author's website Click Here.

 

eteo66

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Mar 31, 2008
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Tony said:
Yes, eteo, there is a book you can refer to for a S.T. no. 7. Steven Conover's "Striking Clock Repair Guide," page 69. You can obtain this book from many places, including the NAWCC gift shop, various horological suppliers (like Merritt's or TimeSavers); or you can visit the author's website Click Here.

Hi,

I do have this book but it mainly refers to the striking mechanism rather than the time movement. There is a rough line diagram showing the time movement. What I am looking for is a step by step dismantling guide. Is there one? thanks!
 

eteo66

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Mar 31, 2008
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Alternatively, is there a similar Seth thomas movement I can purchase and practise on? What number should I get?
 

Tony Ambruso

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eteo66 said:
Tony said:
Yes, eteo, there is a book you can refer to for a S.T. no. 7. Steven Conover's "Striking Clock Repair Guide," page 69. You can obtain this book from many places, including the NAWCC gift shop, various horological suppliers (like Merritt's or TimeSavers); or you can visit the author's website Click Here.

Hi,

I do have this book but it mainly refers to the striking mechanism rather than the time movement. There is a rough line diagram showing the time movement. What I am looking for is a step by step dismantling guide. Is there one? thanks!
No, I do not believe there is any such manual. General disassembly is covered by some texts, but nothing specific for each type of clock. For example, general disassembly and cleaning is covered in Conover's "Clock Repair Basics."

The chapters in "Striking Clock Repair Guide" cover the most unique aspects of the specific clock. It's striking mechanism is that aspect for this clock. Otherwise, chapters would begin to get painfully redundant.
 

eteo66

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Mar 31, 2008
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Ok, I'm slowly giving it a go.

First off, how do I remove the second hand?

Do I simply pull it off carefully?

Thanks
 

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eteo66

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Mar 31, 2008
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Thanks. Is there a similar movement that I can practise on? If so, what number would that be? By the way, how old is the clock? Thanks
 

R. Croswell

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As far as the time side goes, you can get valuable practice with almost any movement that has a similar balance wheel escapement. But the information I have is that the Seth Thomas No. 7 ship's bells movement, at least the one in Steve Conover's book, uses a bell strike design that is significantly different from many other popular designs. So It would be best if you could find another No. 7. This is a relatively valuable clock, so I suggest that you consider having someone with experience get this one working for you, and if you want to practice working on clocks, possibly select a simpler and less valuable movement to experiment with.

Bob C.
 

eteo66

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Mar 31, 2008
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Hi Bob, thanks for your input. As the title says, its the time side I'm looking at rather than the bell strike side. I will at least take the dial off and look at the movement and probably send it in for repair. Thanks a lot!
 
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