Jump to content
  • 0
Tr0phy

Medana pocket watch - broken hairspring

Question

9 answers to this question

Recommended Posts

  • 0

Tr0phy , If you are comfortable changing the hairspring, no worries. If you're a newbie, bring the watch to a watchmaker and ask how much it would cost to change a hairspring It is more difficult to change the part yourself than to remove a screw or to change a wheel because a hairspring is very fragile and is easily twisted if you pay no attention.. Once done, you just have to put everything in the watch . ;)

Share this post


Link to post
Share on other sites
  • 0

To start with it is not a compensated balance, I cannot tell by the pictures but I have a feeling it could be a cylinder escapement. Even with a donor movement the hairspring still might not match, the balance complete would be the answer.   

Share this post


Link to post
Share on other sites
  • 0
2 hours ago, szbalogh said:

If no replacement balance then the hard way.... get a stock HS then measure the vibration and cut to length and finally mount to stud. For a cylinder escapement it is not overcoiled so not that hard.:D

I suppose you think the old hairspring collet can be used?

Share this post


Link to post
Share on other sites
  • 0
Just now, oldhippy said:

I suppose you think the old hairspring collet can be used?

Yes the collet. If one can replace the HS on the collet then fine... maybe in case of bigger watches. 

As i was browsing around it seems to me that stock HS comes collet-mounted. Or not? I am just guessing. 

Since the HS is mounted on the collet like on the stud, theoretically it can be replaced. Never had to do this but there is a description about this topic in DeCarle's books. 

Share this post


Link to post
Share on other sites
  • 0

I'm not knocking DeCarle books but it is a hell of a lot harder achieving this task then just reading it from a book. An experienced watch repairer would find it hard, if the collet gets damaged then finding one that fits will be very hard indeed, after all it has to be the right size, height and width.    

Share this post


Link to post
Share on other sites
  • 0
7 hours ago, oldhippy said:

I cannot tell by the pictures but I have a feeling it could be a cylinder escapement

OH is absolutely right, this is a cylinder escapement. If you look at the rim of the balance wheel just past the 12 0'clock position you can see that there is a little stud poking out of it. Cylinder escapements have to limit the amplitude of the balance wheel to <180 degrees and this is achieved by having a pin underneath the balance cock which sits very close to the balance wheel rim, and a stud on the rim which can't get past the pin.

As far as getting a balance complete from a donor watch is concerned I think that this is going to be something of a wild goose chase. Even if you manage to correctly identify the movement, and manage to find a correctly identified donor, and the cylinder, HS, and pivots are still in good order, the likelihood of it fitting and working is very small. These watches would almost certainly have had a degree of hand fitting done at the manufacturing stage resulting in no two watches being exactly alike. If you are lucky enough to find one that just drops in and works..... buy a lottery ticket :D

Vibrating a new HS is your best bet for a successful outcome but as OH says, this is a technically advanced and somewhat fiddly exercise. Still if you don't try you'll never advance, so I'd give it a go.

Good luck.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Answer this question...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

  • Similar Content

    • By AdamC
      Hello,
      I have a lovely antique cylinder escapement pocket watch that I've serviced and got running beautifully but now I have a problem with the minute hand falling off. I think it's known as a pin hole fitting hand. On measuring the hand it shows approx. 0.40mm, and then on measuring the arbor diameter with the vernier guage, it's also 0.40mm so it's very near but won't even grip when mounted. Photos provided of the job.
      Does anybody have a technique I can use to get the hand to fit?


    • By oldboy
      I am considering selling leather watch straps, but I have a question before I blindly go ahead and produce a bunch of them.
      I am wondering if anybody who has worked in the industry for a while can tell me what the most common sizes are of strap pins or lug widths?
      I would really appreciate it. Thanks in advance.
      Anthony
    • By Bill3
      I am working on an Elgin pocket watch grade 312.  It was an estate sale purchase and was not running when purchased.  I assumed that it was not running because it was very dirty and thought cleaning would solve all the problems.  I completely disassembled it and ran it through an ultrasound cleaner and rinse. It came out bright and shiny and when I started to reassemble for the first time I saw that there was NO roller jewel!  
      So, what now? Can the roller jewel be replaced by a person with very modest ability?  I am including two pictures of the balance and roller plate.  I do not see any sign of where it was attached.  
      Thanks in advance for any guidance.  
      Bill H.


    • By mineglobus03
      Hi everyone, I have some problems with a manual winding watch. It needs some work but I would try to do it myself. The watch appears fully wound but it doesn't work. Which is the problem? Thank you in advance
      Alessandro
  • Recently Browsing

    No registered users viewing this page.

  • Topics

  • Posts

    • Giving my Accutron Yellow Dot a try today, first time on the wrist
    • Hi Gary looks like a reaction between the base metal and the dial paint (oxydisation) probanly due to moisture . Other than stripping the dial I don't think there is a lot can be done unfortunatley.
    • Thank you for answering . Please excuse my ignorance on this subject  Do mean it’s best to use the stem with the Plastic crown that came with the movement? And please could you let me know what the ‘set’ position is ? regards
    • Hi Gary at all times unless testing the movement leave the battery out, whilst manipulating the stem into position .  It will be best to use the stem provided with the module. some of the modules require you to put the stem into set position before removing as this keeps the clutch assembly and associated gears in place to enable an easy fit of the stem. Failure to do so causes the clutch to drop requiring re alignment before the new stem can be fitted. To do that you need to remove the calendar work to gain access to the keyless work.  I have attached the tech sheet which covers this movement for you.        good luck ETA 955.102, 955.112, 955.122, 955.132, 955.402, 955.412, 955.422, 955.432.pdf
×
×
  • Create New...