Jump to content

7S26 balance collet

Elton

By Elton
in Watch Repairs Help & Advice

 Share

Recommended Posts

oldhippy Distinguished Member

oldhippy

Posted
Posted
4 minutes ago, Elton said:

How about using high tech stuff like superglue. Some super- glue has 9 seconds timeframe 

I would be careful with that, you do not know how such stuff when in contact with the hairspring it might cause damage 

jdm Distinguished Member

jdm

Posted
Posted
8 hours ago, Elton said:

The collet has a horizontal slot retaining the hairspring. Is it held on by glue or press fit. 

As mentioned in similar topics before one can't, in practice, do any manipulation 7S26 hairspring collet. It is set at the factory and meant to stay like that for life. So in case of any problem the balance complete must be replaced.

  • Like 1
Nucejoe Distinguished Member

Nucejoe

Posted
Posted
4 hours ago, oldhippy said:

Normally press fitted, but very old watches can be held in with shellac, I have seen many pocket watches with it

I have seen nail polish used as glue on collet-staff, no sign of lacquor damage to metals 50 yrs later.

  • 3 months later...
 Share
Go to topic listing

  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • BobG
      Etachron regulation system

      By BobG · Posted

      Good stuff, thanks!!!  I'm going to save it and re-read your post and watch the video again.  I have a few follow-up question:  My understanding is that the spring vibrates or breathes between the the two regulator pins. When the pins are fully open the effective spring length is from the stud and theoretically no rate adjustment can be made by moving the regulator arm. As the pins are closed the spring gets closer to one side of the regulator block but doesn't touch a pin. You can still move the regulator carrier the entire terminal curve without upsetting the coils.  The rate can now be adjusted using the regulator because the effective spring length can be modified.  My question is: Does the hairspring bounce off and touch one of the pins as it breathes? Is that why the effective hairspring length is adjusted by moving the regulator?  And follow-up: How is amplitude affected by the spring between the pins? Does fully open pins, dial up position = max amplitude?  When spring adjusted to 1/2 width still = max amplitude? When I have crown down gravity is pulling the spring against one of the pins and I would expect rate to go up and amplitude to go down. Is that correct?
    • mikepilk
      Longines with 25.17 caliber

      By mikepilk · Posted

      A quick Google for Longines 25.17 found several similar watches - like this one with writing on the case back similar to yours https://benjaminmarcello.nl/product/longines-cal-25-17-tank-from-1938/
    • Mercurial
      Longines with 25.17 caliber

      By Mercurial · Posted

      Apps like Watch Accuracy Meter can be inaccurate, and will read some watches better than others.  What daily rate does Watch Accuracy Meter give you if you check the Longines once it’s been running for 24 hours? Best Regards, Mark
    • RichardHarris123
      New hobbiest to watch repair from the Netherlands

      By RichardHarris123 · Posted

      Hello and welcome from Leeds, England. 
    • jhoho202
      About repair watch's jewel.

      By jhoho202 · Posted

      Then, can I replace it by purchasing a regular ruby with the same or similar width and height and pivot groove size from eBay? If I replace it like the above and operate the movement, will there be no problem?
×
×
  • Create New...