Mainsprings for a new haven kitchen clock

Discussion in 'Clock Repair' started by BOBJAYR, Mar 14, 2017.

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  1. BOBJAYR

    BOBJAYR Registered User
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    Mar 12, 2009
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    ARIZONA
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    HAVE A NEW HAVEN KITCHEN CLOCK FOR REPAIRS.

    NEED HELP DETERMINING THE CORRECT SPRINGS FOR THIS CLOCK.

    SEE ATTACHED PHOTOS.

    FOUND THE STRIKE SPRING TO BE 108" LONG, 3/4" WIDE AND .014'
    THICK.

    FOUND THE TIME SPRING TO BE 68" LONG, 3/4" WIDE AND .016" THICK.

    THE END OF THE TIME SPRING HAD BEEN CUT OFF.

    THE CLOCK MOVEMENT IS QUITE SMALL AND MEASURES 3 1/2" WIDE
    AND 4 1/2" LONG. ADDITIONALLY THE GREAT WHEEL OR TIME/STRIKE
    ARBOR WHEELS ARE QUITE SMALL IN DIAMETER TO THE ONES i'M USED TO.

    I INITIALLY THOUGHT THE LONG SPRING WAS THE CORRECT ONE BUT WHEN I
    CONSIDER THE SIZE OF THE MOVEMENT AND THE GREAT WHEELS MAYBE THE
    SHORTER ONE IS THE CORRECT.

    I WOULD APPRECIATE ANY HELP YOU CAN GIVE ME ON DETERMINING THE CORRECT
    SPRINGS TO GO IN THIS CLOCK.

    THANKS, BOB[​IMG][​IMG]
     

    Attached Files:

  2. Randy Beckett

    Randy Beckett Registered User
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    May 23, 2012
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    I just finished one of these and was able to reuse the springs that were in it. Not positive they were original, but there were no indications that they weren't. The strike spring was longer than the time spring, at around 108 inches. The time spring was the common 96" length. The springs are the same thickness at .0155-.016.

    The movement runs and strikes properly for something over 10 days. IMO, the replacement springs made for the Korean clocks(3/4 x .015 x 170), shortened to proper length, would work nicely, if the proper replacement size was hard to find.
     
  3. Jasons34

    Jasons34 Registered User

    Jan 1, 2016
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    This is only my opinion but looking at the picture of the springs still attached to the great wheels the longer spring looks good and can be reused as long as it's not damaged but the smaller one looks set and was shortened anyways most likely because the loop end broke or somewhere close to it. No reason why a common 96" long mainspring would not work
     
  4. Randy Beckett

    Randy Beckett Registered User
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    May 23, 2012
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    I agree. The simplest, good replacement spring would be the 3/4 x 16.5 x 96, which is available at all the suppliers. They might have put a longer spring on the strike side just to ensure the clock would stop running before it stopped striking, so the strike sequence wouldn't get screwed up.
     
  5. shutterbug

    shutterbug Moderator
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    Oct 19, 2005
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    Because of the way the smaller spring is designed, I would assume it's either a one day clock, or the spring has been dangerously looped at the end and re-used after it was broken. An 8 day clock should have riveted ends. As it is, I wouldn't want to be the one winding it.
     
  6. Jasons34

    Jasons34 Registered User

    Jan 1, 2016
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    I agree with shutterbug. I don't know how much (if any) strength is lost when bending the end of a mainspring to use as a loop. I know you can bend (to shape) the inner end to help it stay on the pin but I believe it was done like that on purpose. But this is say the middle of the mainspring which shouldn't be bent like that. It's the same thing as bending it in half, strengthening it, and reusing it like normal. It's not something that is safe to do. Replace it.
     
  7. R. Croswell

    R. Croswell Registered User
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    Apr 4, 2006
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    I have two New Havens with similar movements and I used Merritt's #MS-310 3/4" x 0.016" x 108" for both springs in both clocks and they run very well. That shortened spring is not original and there's a good possibility the other one isn't either. 108" will give a bit longer run time if you forget to wind and a bit more even power delivery over the 8-day period. 96" should work but may as well take advantage of the available 108" springs. I feel sure the original maker used minimal material to keep cost down.

    RC
     
  8. BOBJAYR

    BOBJAYR Registered User
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    Mar 12, 2009
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    Thanks to everyone for your help. Yes, I used caution when I wound
    the time spring to put the clamp on before disassembling the clock
    with the looped hook.

    Bob
     
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