Quartz Clock Movements

Discussion in 'Clock Repair' started by Cuckoo348, Dec 21, 2011.

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  1. Cuckoo348

    Cuckoo348 Registered User

    Jun 13, 2004
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    I don't know if this question should be in the clock repair.

    Lately I have been getting Quartz Clocks that are keeping time but the pendulum will not work. I have been replacing the movements. It seems asame to replace the movement because the pendulum does not work.

    Does anyone know how to repair the movement to get the pendulum working? :?|

    "Doc Clock"
     
  2. harold bain

    harold bain Registered User
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    Well, you could reuse the movement in clocks that don't have a pendulum. I doubt there is any easy repair that doesn't involve replacing electronic components. It's kind of "you get what you pay for". If you are buying Chinese made movements, good luck. I use Takane movements, American made (according to the stamp on the movement). I pay more, but don't have them come back.
     
  3. shutterbug

    shutterbug Moderator
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    The pendulums are typically driven by magnets, if that helps :)
     
  4. Scottie-TX

    Scottie-TX Registered User
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    Typically the pendulum is impulsed via a coil and magnet by a switching transistor. Failure of the transistor is usually the cause for stoppage. If electronics is your deal, it's easy to replace. Otherwise, you can buy pendulum swinger modules that in some cases could replace the original. Some assembly required.
     
  5. Willie X

    Willie X Registered User

    Feb 9, 2008
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    Cuck,

    I know this will seem a bit simplistic but did you always replace the battery before making your diagnosis?

    I have seen 100s of single battery time and pendulum clocks that would keep time just fine but not swing the pendulum, and vise verse. Customers bring them in thinking that something must be wrong and all they need is a battery. Seems as though the stepper for the time and the pulse generator for the pendulum coil work well down to a certain battery level and then quit. Problem is that they don't quit at the SAME level.

    Willie X
     
  6. Chris

    Chris Registered User
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    Willie:

    I second that, but must also add that Howard Miller specifically suggests only using Duracell batteries. I thought a battery was a battery, but I've had many calls about clocks not working and told them to switch to Duracell and they call back to say it now is fine.

    I told one of my jeweler accounts about it and he looked at me like I had two heads, but he tried it and now is a believer, too. I was told that cheaper batteries often have a clear coating that can limit power transmission and cause problems.

    I'm sure someone will debunk this, but I'm stickin' with the copper-top!
     
  7. harold bain

    harold bain Registered User
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    #7 harold bain, Dec 22, 2011
    Last edited: Dec 22, 2011

    Yes, this is quite right for the Hermle Westminster movements, that certain battery makes won't work. I use only Rayovac batteries in these with good results.
    But I haven't run into any other types of quartz movements that this applies to.
     
  8. Chris

    Chris Registered User
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    I have it happen frequently to the general Chinese ones (Tekani, Quartex, etc.). I had a woman come to me yesterday with one in which a battery leaked (normally a kiss of death). She claims to have put another battery in and no luck, so I dropped in a Duracell without cleaning it and it worked fine! I cleaned off the dried acid and cleaned up the contacts and she was on her way.

    By the way, I know it's off-topic, but I never throw away dead quartz movements. I find that many that are damaged by battery acid simply need to be taken apart, cleaned, and sometimes have a solder repair in the area where the contacts touch the circuit board. I use them in my own projects. Also, truly dead ones often have plastic gears that can be used to repair old electric clocks (I've "restored" several Kit-Cat electric ones using a gear section from a quartz clock to repair the Intermatic motor). Who knew recycling could be so fun!
     
  9. Tinker Dwight

    Tinker Dwight Registered User

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    Hi
    The electronic part of these is virtually the
    same. It is possible, if you have a movement that
    is particularly hard to find a fit for and the
    chip has failed, one can cut a chip/board from
    a working movement and wire it in inplace
    of the bad one.
    One just needs to trace the circuit and match
    up destinations.
    Mosly the chips are now days mounted directly
    on the boards with a blob of epoxy. Just some
    careful cutting and avoiding flexing the board
    so as to not break the internal parts.
    Tinker Dwight
     
  10. dAz57

    dAz57 Registered User

    Dec 7, 2011
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    what I find with the pendulum drive is the knife edge suspension is of course plastic, the plastic wears and creates so much friction that the pendulum will stop swinging, if they used a suspension spring then they would last a long time, I have an old schatz battery movement that uses a transistorised magnetic impulse to drive the pendulum, in this case the pendulum is the regulator, the clock is 30 odd years old or more still works fine.
    -> posts merged by system <-
    as for recycling I don't throw the old movements out, I have used the circuits to restore function to a dead quartz clock where the movement might be specialised, and the new circuits are a lot smaller so will fit in easy.

    and another use I found yesterday, I have Ford car clock that came in for repair, this is a small Smiths 6 volt driving balance movement, all metal, with jewelled balance pivot holes, this has the simple switching with a spring loaded finger on the plate and a silver? pin on the balance wheel to make contact, the coil was open circuit, so I checked the wire size 0.10mm dia and found the wire used in the most quartz battery movement coils are quite close, anyway I rewound the smiths coil and the clock is working :D, just a normal service later and this should be ready to got back in the vintage car
     
  11. bangster

    bangster Moderator
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    Oy. Vot a clock talk already.
     
  12. Cuckoo348

    Cuckoo348 Registered User

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    Hi Cris,

    You just made a believer of me. The Howard Miller clock I have in my shop had new Eveready batteries and the pendulum was not working. I put two Duracell batteries in the movement. The pendulum is working fine.

    "Doc Clock"
     
  13. MARK A. BUTTERWORTH

    MARK A. BUTTERWORTH Registered User
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    The earlier movements 2214/2215 made by Hermle and used by Miller and others have a negative terminal that does not always make good contact with the Energizer and some house brands due to a plastic film around the rim of the negative terminal of the battery.
     
  14. Cuckoo348

    Cuckoo348 Registered User

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    Thanks Mark,

    I have been repairing clocks now for over 12+ years. And learn something new every day.

    "Doc Clock"
     
  15. David S

    David S Registered User
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    I too have had some battery operated pendulum clocks come my way. The last one had severe wear on the back pivot (directly over the pendulum) The wear was in the pendulum and the mating knife edge was good. I took a small piece of brass shim stock about 0.002" thick, formed it into a V and with a dap of cyanoacrolate adhesive, placed it into the pendulum piviot. So far that clock has been working for weeks now with a full pendulum swing.

    David
     
  16. dAz57

    dAz57 Registered User

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    I think the problem is the knife edge and seat are made of similar materials, bit like when you see a brass wheel driving a brass pinion, you will see a lot more wear in short time compared to a brass wheel driving a steel pinion, doing something simple like using the brass shim should extend the life of the suspension, but of course that is not in the best interest of the manufacturer, they would rather you replace the movement.
     

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