Schatz Quartz 400 day hair spring pendulum assistance

Discussion in 'Electric Horology' started by David S, May 2, 2012.

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  1. David S

    David S Donor

    Dec 18, 2011
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    #1 David S, May 2, 2012
    Last edited: May 2, 2012
    Hi Folks,

    I received the subject clock today. Keeps good time, pendulum doesn't work. Apparantly the top came loose at one time and the swinging magnets cut into the coil on both sides. There is significant damage and fairly deep into the coil. I would need a microscope to even try and fix it.
    Are any components available for these movements. Sigh, this is a sentimental wedding aniversary clock, so I am trying to fix it for the lady.

    Any assistance will be appreciated.

    Thank you
    magnets.jpg broken coils 2.jpg
     
  2. eskmill

    eskmill Registered User

    Aug 24, 2000
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    David. Is this actually a quartz controlled timepiece? Or is it a transistor switched electromagnetic oscillating torsion device made to operate in the same manner as the fake pendulum seen on quartz wall clocks?

    I suspect the damaged coil is a three-lead, two-coil combination sense-drive coil assembly much like those used to wig-wag the fake pendulums.

    You could possibly purchase one of the more powerful fake pendulum devices used for long pendulums and salvage the coil to repair the lady's clock. The tricky part is identifying the coil leads while carefully removing the damaged part and substituting the replacement coil with the wires properly oriented.
     
  3. David S

    David S Donor

    Dec 18, 2011
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    Les, I think it is a two transistor astable multvibrator. I will trace the circuit tomorrow. And yes it is two coils.. three leads...one lead is actually two leads, one from each coil. From what I can tell so far this is not a sense drive, but rather a "push -pull" arangement. But once I trace the circuit I can confirm. The coil OD is 10 mm and the height is 3mm, so quite small.. I have various diameters of magnet wire, and if I have a small enough gauge, I may try and wind a new coil....if I can't find a replacement.
    The main time train is quartz, but the pendulum seems to be controled by a separate circuit that just pulses the coils with a hairspring on the pendulum to control the oscillation.
     
  4. David S

    David S Donor

    Dec 18, 2011
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    Les here is the schematic. I guess if no one can suggest a replacement for this coil, I will start making some form toolling and try and wind a new one.
    pendulum driver schematic.jpg
     
  5. David S

    David S Donor

    Dec 18, 2011
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    I guess this is the last request. I managed to wind a new coil, but unfortunately I didnt' have fine enought magnet wire.

    If no one can suggest a suitable alternative I will close this thread.

    Thanks to all.
     
  6. Watchfixer

    Watchfixer Registered User

    Jun 11, 2011
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    There one on ebay, not expensive.

    Cheers, Watchfixer
     
  7. Kevin W.

    Kevin W. Registered User

    Apr 11, 2002
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    David have you tried Perrins from Toronto for the parts you need.
     
  8. David S

    David S Donor

    Dec 18, 2011
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    Kevin I looked at Perrins on line but didn't see anything for this type of rotary pendulum. I will email them to see if they have something.

    I made a new coil but the smallest magnet wire I had was about 0.11mm diameter and it didn't work. The orginal coil wire diameter is about 0.035mm. I found an a/c coil relay in my junk box, and have taken it apart. The wire is very close, so I am going to make one more attempt. It could be a challange to wind it without breaking... we will see.
    Thank you to all for providing tips.
     
  9. Kevin W.

    Kevin W. Registered User

    Apr 11, 2002
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    Winding a coil is a skill David, i wish you luck as well.Likely there are places online to buy the fine wire needed for coils.
     
  10. David S

    David S Donor

    Dec 18, 2011
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    Yes Kevin. I am sure you have seen these coils. Actually two coils bifilar wound and with no coil forum. The coil is stuck to gether as a solid with some sort of varnish or adhesive. I made an adjustable forum which I used release agent on and wound the first one, impregnated it with super glue as I progress, then removed the forms. It fit nicely, but not enough turns and too low a resistance. Just have to be very carefull on the next one. But that will be my last attempt.
     
  11. David S

    David S Donor

    Dec 18, 2011
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    Well alas I can close this thread. My second attempt to wind the coil proved successful. Took a bit of screwing around to get the coils phased, but the pendulum is now swinging full revolutions stop to stop. Would I do it again? I guess so, as long as I can get the fine wire, the customer really wants it fixed and there are no other alternatives.
     
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