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My mecanical watch stops spinning after 30 minutes?

Akalit
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Akalit New Member

Akalit

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Hi everybody !

I'm really new to this fabulous hobby that is watchmaking and I would like to know if somebody is capable of helping me 

(I can make some mistakes in english and i am sorry for that).

Now my problem is:

I wanted to make a service for an old ''Lorsa caliber P62''. Everthing was fine until the moment when I winded up for the first time after the rebuild. The movement can't hold 1 hour!
Then I decided to take a look at the mainspring: Nothing bad but I ordered a new one with the right dimensions just in case. After receiving my new mainspring, same results:
It's spinning 10/20/30mn and suddenly slows down and slows downs smoothly, until it completly stops.
I really don"t know what can happen? Everything seems to spin freely, no dust or over oiling...

All that said, if I really wanted to wear this watch and not worry about, I won't be there to ask some help: I have a local watchmaker on my city.
But I really want to understand and fix this watch by myself. It's a 20$ watch that I bought to disassemble and re-assemble for the sake of science! If she's broke, it's ok but if I can find what the issue is, It's fabulous!

So here it is! If anybody had already faced this strange issue, let me know how can I fix it or what can cause this ! 

Thank you very much and have a nice day !

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Neverenoughwatches Distinguished Member

Neverenoughwatches

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Posted (edited)
17 minutes ago, Akalit said:

Hi everybody !

I'm really new to this fabulous hobby that is watchmaking and I would like to know if somebody is capable of helping me 

(I can make some mistakes in english and i am sorry for that).

Now my problem is:

I wanted to make a service for an old ''Lorsa caliber P62''. Everthing was fine until the moment when I winded up for the first time after the rebuild. The movement can't hold 1 hour!
Then I decided to take a look at the mainspring: Nothing bad but I ordered a new one with the right dimensions just in case. After receiving my new mainspring, same results:
It's spinning 10/20/30mn and suddenly slows down and slows downs smoothly, until it completly stops.
I really don"t know what can happen? Everything seems to spin freely, no dust or over oiling...

All that said, if I really wanted to wear this watch and not worry about, I won't be there to ask some help: I have a local watchmaker on my city.
But I really want to understand and fix this watch by myself. It's a 20$ watch that I bought to disassemble and re-assemble for the sake of science! If she's broke, it's ok but if I can find what the issue is, It's fabulous!

So here it is! If anybody had already faced this strange issue, let me know how can I fix it or what can cause this ! 

Thank you very much and have a nice day !

Hiya matey. It could be many things. How specific in time is the stopping of the watch ?  Is the stopping of the watch in dial up position only ? How do you restart the watch ? With a shake ?. One posible cause could be a very poor beat error that is allowing the watch to run a short lengrh of time only. Do you own a timegrapher to check this ? There are other ways if you do not have one. 

Edited by Neverenoughwatches
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Akalit New Member

Akalit

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24 minutes ago, Neverenoughwatches said:

Hiya matey. It could be many things. How specific in time is the stopping of the watch ?  Is the stopping of the watch in dial up position only ? How do you restart the watch ? With a shake ?. One posible cause could be a very poor beat error that is allowing the watch to run a short lengrh of time only. Do you own a timegrapher to check this ? There are other ways if you do not have one. 

Hey thank you for your quick answer !!

 

So,

the watch is stopping in winding position but the crown can spin freely without noise or grip on both position. I don't think the probleme is here.

I restart the watch by re-winding it, but since the movement previously stopped, the balance wheel stays ''stuck'' (It didn't start spinning right after the winding). Then I try to move and touch some of the gears and it start spinning again!! It really depend on what I carefully touch with the tip of my screwdriver. I don't think it is a problem of a piece that can be bend or stuck by dust, because when I remove the whole barrel everything is spinning smoothly: I even can move easily the balance wheel with a little bit of air or by turning the movement on itself.

I sadly do not own a time grapher. If it was a beat error, what can be the cause? I mean, what, in the watch, do not allow the movement to run 24 hours? The pallet fork?

My theory is a mis-alignement of gears but like i said, everything moves freely and if something was bend, the movement shouldn't spin at all, right? Not 30min and then stop... Right now the movement is spinning for about 1 hour now but I know it gonna stops soon...

 

Maybe I am all wrong and I still have a lot to learn (for sure) but from my understanding of basic mecanics, there's something I don't get!

 

Thank you very much again for trying to help me 🙂

 

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Neverenoughwatches Distinguished Member

Neverenoughwatches

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1 hour ago, Akalit said:

really depend on what I carefully touch with the tip of my screwdriver. 

Hi. If i can give you my first piece of advice before trying to solve the movement issue.  As beginner it is best not to do any prodding or poking inside a movement with something hard like a screwdriver or tweezers. The ideal material to use would be some rodico that you can roll up very thin, if not that then a small piece of plastercine or putty but bere in mind this can leave a tiny oil residue. If neither of those then the  very fine tip of an artists paintbrush.

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Nucejoe Distinguished Member

Nucejoe

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Posted
1 hour ago, Akalit said:

the watch is stopping in winding position but the crown can spin freely without noise or grip on both position. 

Sounds like the fault is in the keyless.

Would it wind if you try winding through the ratchet wheel screw?   Be careful, avoid full wind and forcing the screw, one turn (360 degrees) will do. 

Regds

 

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