Jump to content

Is this pivot broken


Recommended Posts

Hi all, I fell stupid for even asking this but does anyone think the top pivot is broken (the hairspring side). my eyes cannot quite make it out even with this magnification,  I serviced this watch 2 years ago and it has just come back to me , the owner said very rarely wore it just been sitting in a drawer takes it out a few times a year to wind it. last time he took it out it had stopped working. It was fully wound when returned to me and as soon as i slackened of the balance cock screw it started running, re tighten it stopped. literally half turn of the scvrew would start it running and in dial down position on the timegrapher it ran perfectly dial up terrible -897 and like it was magnetized so I assumed a broken or damaged pivot or dirt etc, when i took the balance off the cock as shown in the pics the first thing I see is a tiny piece of metal stuck to the underside prob 0.1 mm in length which I took to be the tip of the pivot but looking at the staff under the microscope I am not sure, what does anyone think. the watch is a vintage 1930s gruen curvex cal 440.

IMG_5970.JPG

IMG_5969.JPG

Link to comment
Share on other sites

no that little bit of metal was stuck to the underside of the balance cock hence i assumed a broken pivot, you have confirmed what i really thought so i an thinking just dirt or congealed oil, the balance pivot was black on the end and i have now cleaned it and polishes it a bit, i have stripped the cock and cleaned the jewel and cap so will put back together and hope this solves the problem. thanks for the input.

  • Like 1
Link to comment
Share on other sites

no it still did not run properly even with the balance stripped and cleaned. It ran very slow on the amplitude almost stopping . I have now completely stripped it and cleaned it  and will start from scratch. I did notice that the mainspring seemed to be partly set so I have ordered a new one with my thinking being that the spring was not putting out enough power to move the balance as also if I touched the centre wheel it started the balance running properly. Fingers crossed that will be the answer.

Link to comment
Share on other sites

On 2/7/2024 at 7:29 AM, quantieme said:

vintage 1930s gruen curvex cal 440.

One of the things that helps on these discussions is a name like we have above sometimes a picture is nice to see what were talking about

http://www.gruenwristwatches.com/440-movement.php

On 2/7/2024 at 7:29 AM, quantieme said:

I serviced this watch 2 years ago and it has just come back to me , the owner said very rarely wore it just been sitting in a drawer takes it out a few times a year to wind it. last time he took it out it had stopped working. It was fully wound when returned to me and as soon as i slackened of the balance cock screw it started running, re tighten it stopped. literally half turn of the scvrew would start it running and in dial down position on the timegrapher it ran perfectly dial up terrible -897 and like it was magnetized so I assumed

So we have a interesting background history. Also it's always nice if you show us the timing machine results so we can see what it actually looks like it helps for us trying to diagnose.

3 hours ago, quantieme said:

I did notice that the mainspring seemed to be partly set so I have ordered a new one with my thinking being that the spring was not putting out enough power to move the balance as also if I touched the centre wheel it started the balance running properly. Fingers crossed that will be the answer.

When you service the watch the first time did you change the mainspring? Because one of the problems with especially original spring is the blue steel ones they definitely have a habit of setting. Then unfortunately vintage old new stock mainsprings also have a habit of setting. With the added bonus now that the quality of some modern Springs isn't much better than the original Springs.

 

Link to comment
Share on other sites

yes it was an vintage new old stock blue steel spring that I had in my stock, the new one that I have ordered from cousins appears to be a new one which as i type this has just turned up, also interestingly the size given on the Gruen website for the spring is different from the one in the GR catalogue (Gr2631 H 1.10 x T 0.11 x L 240 BD 8.5). I take your point about pictures I will endeavor to include them in future posts.

IMG_5990.JPG

IMG_5989.JPG

IMG_5988.JPG

IMG_5977.JPG

IMG_5975.JPG

Link to comment
Share on other sites

definitely set.

IMG_5991.JPG

well the spring did not work, balance was still the same running intermittently and has now stopped altogether. Having a good look it is possible looks like the balance spring is slightly bent and is rubbing on the balance arm. Anyone know where I can get a new balance from for a 440 or 335 cal. 

best i can do pic wise

IMG_5992.JPG

Link to comment
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
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  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.



  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • Nice one Andy- a very ‘blingy’ 404 with all those jewels…
    • It's a matter of preference really. You should keep the #5 aside and just use them for fine hairspring work though; otherwise they will end up damaged and be useless for that. Some like #1, some #2, some #3 for general work. Some use brass or nickel tweezers for general work- this is good as they are less likely to scratch delicate parts, and are much "grippier". On that note, the finer the tweezer, the more likely it will be to want to launch parts.   I have a bunch of nickel tweezers that have been retouched so many times they are like 30% shorter than new. Those become handy for when you need very strong tweezers- just used a pair to unscrew the bond from inside a floating barrel. My general use tweezers the last few years are a couple of pair of #5 that have been sharpened enough times that the ends are now very strong; useless for hairspring work, great for general work. These are Dumont Dumostar, which is a much more tough alloy than the Dumoxel, and less brittle than their carbon steel ones.
    • Hold the end stone down in chaton with your tweezers to remove the rodico.   Once shock spring is locked in the setting, you can whipe / clean  any residue off the setting.     Swiss setting holds the spring in place but the spring in chinese setting  fall out.  To remove the srping from Swiss setting , you got to remove the setting or at least raise it .
    • I purchased a set of tweezers #1, 3 and 5). I pretty much just use the #1 all the time. Just wondering if there is a guide any guidance on when to use different tweezers. I suspect that many people have their own preferences, but given the many different shapes and sizes, there must be some method to the madness, as they say. 
    • Yeah - the spring on my incabloc seems to fall out a lot. I have noticed the people doing videos using the eta movement seems to have a much easier time manipulating the screen. I was wondering it is just more practice (probably) or if the Swiss movement just fits together better at the hinge. 
×
×
  • Create New...