Jump to content

ETA Running Problem


Recommended Posts

Hi

I have a ETA 2801-2 that runs reasonably well when it is on a full wind : Amplitude-232,  Beat error - 1.0, Rate- +10sec.  with the regulator in the central position. After appx. 15 hours the numbers are as follows: Amplitude-198, Beatt Error-2.5, Rate- +30sec. I would appreciate suggestions as to what might be the problem. I'm thinking maybe it is a Mainspring problem.

Thank you,

Tony

Link to comment
Share on other sites

29 minutes ago, spiro13 said:

Hi

I have a ETA 2801-2 that runs reasonably well when it is on a full wind : Amplitude-232,  Beat error - 1.0, Rate- +10sec.  with the regulator in the central position. After appx. 15 hours the numbers are as follows: Amplitude-198, Beatt Error-2.5, Rate- +30sec. I would appreciate suggestions as to what might be the problem. I'm thinking maybe it is a Mainspring problem.

Thank you,

Tony

Tony,

 

It likely just needs a service and new mainspring. That amplitude is on the lower side.

Link to comment
Share on other sites

I too agree with the others. A service, a new mainspring and regulating it would likely get your watch in perfect order. For a top notch modern movement like your ETA calibre 2801-2 the B.E. shouldn't be more than about 0.3 ms.

Link to comment
Share on other sites



  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • Hello from the Mid-Atlantic United States. I've been in the hobby for a few months and have concluded that I will be staying in it for a while. I've started to get some proper tools and I am looking forward to developing some skills. My current goal is to get comfortable enough to service / repair some watches I've inherited from family members.  My current project is a Mentor pendent watch with a BF866 movement that belonged to my great aunt.
    • Success! The watch is working, albeit not perfectly. I need to install a new mainspring. It only runs about 16 hours. Still, it's my first cleaning and rebuild. I bought it from the original owner's son on eBay! The other one was bought at a flea market. I needed both to complete the project. The model with a seconds hand had soldered watch band pins and I couldn't drill tiny holes so I used the flea market Waldan, which was nearly a perfect match. I also replated the case with nickel, but the result was subpar. It's never as easy as it looks.
    • Thanks guys. It's a Seawolf 10ATM pre spring bezel. The case knife stressed me a bit, but eventually got it off and cleaned - nearly seventy years of grime.  Thanks.  Cheers John
    • Exactly. This is a pic of the hairspring I'm working on. My horizontal v vertical rates are all over the place. There is no discernible terminal curve. My problem is that the outer coil is (possibly) hitting the regulator pin. It's hard to tell but it looks to be getting very close. Also getting close to the stud, which could be @VWatchie's problem. You can see that I need to adjust the inner coil to centre the collet. That will hopefully solve the problem. But then I'll take the spring off and attach it to the cock to see how it looks.   I don't know if it's causing your problem @VWatchie, but I would say your inner coil looks like this  
×
×
  • Create New...