Cuckoo Clock runs too fast

Discussion in 'Clock Repair' started by Ansel Spear, May 16, 2017.

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  1. Ansel Spear

    Ansel Spear Registered User

    May 16, 2017
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    I've just had my Regula 25 1-day cuckoo clock returned from service after about 3 years. The pendulum appeared to be the original one, and its leaf weight was approximately in the position I remembered it to be on the stem. However, initially the clock gained 80 minutes across 12 hours. Even when the leaf was moved to an unnaturally low position on the stem (almost off the end), it still gained about 5 minutes across 12 hours. I have now been sent a pendulum with a much larger leaf and, again, I've had to move this to a very low position on the stem to get it almost within tolerance. But it looks odd.

    View attachment 343855

    Could anyone please advise me whether there are any other factors that may change the workings of the mechanism. I notice that the chains have been replaced. The weights look like the original ones, but I did not make a note of their spec before I sent the clock away.

    All suggestions extremely welcome. Thanks.
     
  2. roughbarked

    roughbarked Registered User

    Dec 2, 2016
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    3 years?

    Is that the last time fresh oil was applied?

    I did not make note, is a bad appraisal.

    forget the size of the weight or the length of the original rod?
    what is different about the chains?
     
  3. harold bain

    harold bain Forums Administrator
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    Replacing the movement could have this affect on the pendulum, as they come with 3 different rated pendulum lengths. A new movement comes with new chains.
     
  4. roughbarked

    roughbarked Registered User

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    Yeah. A new movement is ALL new and it should actually not need to be regulated off the end of the pendulum thread, in any direction. Unless of course the old pendulum is applied to the new movement without viewing the pendulum supplied with the new movement. But.. after three years the repairer should probably have noticed this.
     
  5. Ansel Spear

    Ansel Spear Registered User

    May 16, 2017
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    To be honest, it probably hasn't been oiled since 1987! But during that time, the adjustments to the pendulum have been minor. I haven't taken the back off, but I paid for a service, and not a new movement. He didn't mention a new movement when I collected it so I'm assuming it's the original.
     
  6. Tinker Dwight

    Tinker Dwight Registered User

    Oct 11, 2010
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    I'm with Harold on this one. It is usually cheaper replace these movements
    than to repair them.
    My guess is that they swapped in the wrong movement.
    Tinker Dwight
     
  7. Ansel Spear

    Ansel Spear Registered User

    May 16, 2017
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    The movement wasn't so much faulty, as a local company messed about with it, and the sync between all the functions was completely out. This was corrected and a service given (so I have been told).
    Apart from memory and commonsense, how can I determine whether it's a different movement? If they have swapped in the wrong movement, why would that affect its regulation., Apologies if these are dumb questions.

    - - - Updated - - -

    What is different about the chains? They're not tarnished like the others were.
     
  8. roughbarked

    roughbarked Registered User

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    #8 roughbarked, May 16, 2017
    Last edited: May 16, 2017
    It has to be a reluctant cuckoo clock that takes three months to get out of here and I have never replaced a cuckoo clock movement in 46 years of repairing them.

    Sonmebody has mucked up somewhere.
     
  9. harold bain

    harold bain Forums Administrator
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    There are no threads on these cuckoo pendulums. And new movements don't come with new pendulums. My suspicion is due to poster saying there are new chains. The only other thing would be a too short pendulum instead of the original one, if the movement was not replaced.
     
  10. Willie X

    Willie X Registered User

    Feb 9, 2008
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    A good close-up photo of the movement will tell the tale.

    3 years! Never leave anything anywhere for more than a month or two ... you're lucky to get it back.

    Willie X
     
  11. THTanner

    THTanner Registered User
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    Maybe it is just trying to make up for lost time :-X

    Seriously - have you noticed the minute hand suddenly moving ahead way too fast and hearing a "flutter"? It is not common on cuckoos, but could happen.


     
  12. Tinker Dwight

    Tinker Dwight Registered User

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    He needs to run it for a few hours to tell if it is fluttering ( possible ).
    Let it run and check it once an hour and note the difference.
    If it is fluttering, there will be a different amount of time gained
    for each hour. If it is a constant gain, each hour, it is the pendulum
    length issue.
    Tinker Dwight
     
  13. shutterbug

    shutterbug Moderator
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    That sounds like the most likely scenario to me too. I'd send it back to the shop to do it right.
     
  14. harold bain

    harold bain Forums Administrator
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    Only if he is prepared to wait another 3 years. I would try to find a longer pendulum if that is the only problem noted.
     
  15. MARK A. BUTTERWORTH

    MARK A. BUTTERWORTH Registered User
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    Look onThe back of the movement. On the right-hand side on the vertical pillar check to see if there is a centimeter number that would be the pendulum length
     
  16. Ansel Spear

    Ansel Spear Registered User

    May 16, 2017
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    Thanks Mark. I didn't know that.
     
  17. Ansel Spear

    Ansel Spear Registered User

    May 16, 2017
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    It was a bit of a problem and not what I had anticipated.
     
  18. Ansel Spear

    Ansel Spear Registered User

    May 16, 2017
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    View attachment 343944 View attachment 343945

    I'm fairly sure that this is the original mechanism. I can't find an indication of pendulum length. The regulation is roughly correct now with this replacement pendulum setting. It's much, much lower than before the service. See original pendulum as comparison.
    View attachment 343946
     
  19. Chris D

    Chris D Registered User
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    Could be that the repairer swapped out the chain wheel for some reason... worn pivot, broken click etc. He may have installed one with a different tooth count by mistake and now you need the longer pendulum.
     
  20. Tinker Dwight

    Tinker Dwight Registered User

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    I doubt a chain wheel would make it run fast. More likely the escapement wheel
    was replaced.
    It does look to be an unusual movement so not likely to be a replacement.
    I've not seen that coupling before for the music.
    One wonders if a 3 year sit in the shop that it may have been apart and
    lost a few pieces.
    It would be interesting to watch it running while viewing from the back side.
    A video would be a big help for us to help you.
    Tinker Dwight
     
  21. Ansel Spear

    Ansel Spear Registered User

    May 16, 2017
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    I'll see what I can do with the video. Thanks.
     
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