Jump to content

Retrofitting a hairspring

Fred

By Fred
in Watch Repairs Help & Advice

 Share

Recommended Posts

oldhippy Distinguished Member

oldhippy

Posted
Posted

Is the movement the same caliber? If yes it should be ok, but the balance will need ajusting. If the answer is no, then forget it. You will have so many problems, timing, beat error ajustment just to name a few. 

Link to comment
Share on other sites
rogart63 Distinguished Member

rogart63

Posted
Posted

Can be done but takes some tinkering. Easiest is to use the right hairspring . I am doing this with a Eterna watch where i can't find a balance and hairspring.  So i have used a balance from a MST 317 movement . It runs but is running slow. So need to shorten the hairspring a little. This has been a long project that i have worked on for several month. And will probably not run super. But will work okay in the end i think. Right now i am waiting for a longer balance staff . As the 317 was to short. Making the wheel touching the pallet fork bridge. 

Link to comment
Share on other sites
Fred Watch Enthusiast

Fred

Posted
  • Author
Posted
46 minutes ago, oldhippy said:

Is the movement the same caliber? If yes it should be ok, but the balance will need ajusting. If the answer is no, then forget it. You will have so many problems, timing, beat error ajustment just to name a few. 

No it's not the same caliber, that would've been somewhat straightforward, I have an Omega 625 and couldn't find an affordable balance cousins UK have it for 325 pounds, I thought maybe I can fit a different hairspring see how it goes.

Link to comment
Share on other sites
Fred Watch Enthusiast

Fred

Posted
  • Author
Posted
40 minutes ago, rogart63 said:

Can be done but takes some tinkering. Easiest is to use the right hairspring . I am doing this with a Eterna watch where i can't find a balance and hairspring.  So i have used a balance from a MST 317 movement . It runs but is running slow. So need to shorten the hairspring a little. This has been a long project that i have worked on for several month. And will probably not run super. But will work okay in the end i think. Right now i am waiting for a longer balance staff . As the 317 was to short. Making the wheel touching the pallet fork bridge. 

I'm gonna try it and see, maybe I'll be able to find a donor movement for cheap in the future. Make sure you take pics while working on it, we'll be glad to see them here.

Thanks again

Link to comment
Share on other sites
rogart63 Distinguished Member

rogart63

Posted
Posted (edited)
47 minutes ago, Fred said:

I'm gonna try it and see, maybe I'll be able to find a donor movement for cheap in the future. Make sure you take pics while working on it, we'll be glad to see them here.

Thanks again

I will. Btw look for Tissot 2141 as that is essentially the same movement. Like this ebay 163044591097

http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&2&2uswk&Tissot_2141

Edited by rogart63
  • Like 1
Link to comment
Share on other sites
clockboy Distinguished Member

clockboy

Posted
Posted
12 hours ago, Fred said:

Hi everyone,

I'm wondering if it's possible to fit a hairspring from another watch given that the beat, the roller and the collet fit correctly.

Thanks alot

Yes because I have done this. However manipulation is required.

Link to comment
Share on other sites
rodabod Distinguished Member

rodabod

Posted
Posted

Yes, these smooth-rimmed balance wheels are less flexible when it comes to fitting different hairsprings as there are no screws to attach timing washers, or conversely no screws to remove to lighten. 

You also have to consider the hairspring material as it should be some sort of Elinvar in order for it to have suitable temperature compensation. 

Link to comment
Share on other sites
  • 3 months later...
Nucejoe Distinguished Member

Nucejoe

Posted
Posted

Can be done,

Producing the design; ( desired) frequency is the aim. 

I plan to write and post an article on the forum, a breif explanation of the dynamics of balance wheel, metalurgics of H/S, industrial proccess of H/S production... which I believe shows the way to a repairman's better understanding of what he is doing.

Just needs some time, I am old and lazy.

Regards.

  • Like 2
Link to comment
Share on other sites
  • 3 weeks later...
 Share
Go to topic listing


  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • AlanB
      Quarter repeater mainspring thickness

      By AlanB · Posted

      In repairing a generic Swiss cylinder quarter repeater pocket watch with no repeat mainspring I'm trying to work out how to determine the size of a suitable spring.  Barrel ID 7.6mm, Arbor 2.77mm height around 1.45mm. Clearly only one turn is used plus setup, but the only actual figure I can find in Saunier who says in the previous half century 3.5 turns was considered good (and Saunier is about 1880).  Calculating off that would suggest about a 0.15mm thick spring 128mm long. That feels intuitively a little thick, but I don't have another repeater conveniently to hand to check so any pointers welcome.  Photo shows the repeat train assembled without the bridge since that hides everything.   Alan  
    • nickelsilver
      Pocket watch escape wh

      By nickelsilver · Posted

      To identify movements the standard practice is the actual diameter of the movement, and a front on image of both the movement side and the dial side- minus the dial. The setting mechanism (under the dial) is considered the "fingerprint" of the movement and 9/10 leads to full identification.
    • Bonefixer
      Pocket watch escape wh

      By Bonefixer · Posted

      What of? The wheel itself (standard lever escapement) or the plate with no numbers on it? Does that help, from the ebay listing?
    • Kkramme
      Blew it with a coil

      By Kkramme · Posted

      Thanks. I did make a self introduction— perhaps in the wrong place? 🤔😢In any I am an Australian 🇦🇺 American living in the beautiful Gold Coast, Queensland Australia. I love Grand Seiko and Seiko watches, and recently came back from the Grand Seiko Shizukuishi Studio in northern Japan where I was blown away by the design artistry and technical excellence. More later on that (including photos, if interested!)
    • rossjackson01
      Pocket watch escape wh

      By rossjackson01 · Posted

      Bbefixer. I had the same type of problem when I first joined the forum. A pocket watch movement with no markings. Photographs of the the movement, and the members came to the rescue. Within days I had a number of suggestions. Found the details and information of the movement on ranfft. Never managed to get a donor, but at least I know what I need.  The members are really knowledgeable.
×
×
  • Create New...