New Haven Mainspring advice

Discussion in 'Clock Repair' started by Hogshair, Apr 20, 2017.

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  1. Hogshair

    Hogshair Registered User

    Sep 6, 2014
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    Hi all, the spring in the picture is from the strike side of my New Haven movement. Is it still serviceable, or should it be replaced? I dismantled the clock so as to reset the strike (thanks RC & TD) and have another chance to practice resembling.

    As this is an open spring I assume the rules (just read about some of those) for a spring that lives in a barrel don't apply? So, apart from obvious things like cracks and rust, how do I tell if it's a bin job due to lack of power?

    Cheers
    Hogs.

    [​IMG]


    The more I ask the more I learn.
     
  2. Willie X

    Willie X Registered User

    Feb 9, 2008
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    Looks normal to me.
    Willie X
     
  3. THTanner

    THTanner Registered User
    Donor NAWCC Member

    Jul 3, 2016
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    Carson City, Nevada
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    I am not sure if it is a bin job - but if it is - I have found it helpful to keep these old springs to use when I need to make certain kinds of springs or spring washers. So if you decided that it is a bin job - make it an "old spring metal" bin job for when you need a nice piece of spring steel in the future - and don't just toss it away for good.

     
  4. kinsler33

    kinsler33 Registered User

    Aug 17, 2014
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    Science teacher, writer
    Lancaster, Ohio, USA
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    Looks okay. You'll likely have to tighten the innermost coil so that the hook on the winding arbor can reach through the hole on the mainspring.

    M Kinsler
     
  5. R. Croswell

    R. Croswell Registered User
    NAWCC Member

    Apr 4, 2006
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    Looks like it should be OK. Any spring that's been in service for a few years will expand less than a brand new spring but will still have plenty of power.

    RCc
     
  6. shutterbug

    shutterbug Moderator
    NAWCC Member

    Oct 19, 2005
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    Self employed interpreter/clock repairer
    Iowa
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    I almost never replace a spring, because most of the new ones are junk.
     
  7. Kevin W.

    Kevin W. Registered User

    Apr 11, 2002
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    Nepean, Ontario, Canada
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    I am with Shutt, rarely replace main springs. The one in the picture looks fine to re use.
     
  8. Hogshair

    Hogshair Registered User

    Sep 6, 2014
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    Hi all, thanks for the help, appreciate it. Surprised to hear that new springs don't make the grade.:(

    Is that across the board as in all suppliers or are there one or two manufactures out there still turning out the good stuff?

    Cheers
    Hogs.
     
  9. shutterbug

    shutterbug Moderator
    NAWCC Member

    Oct 19, 2005
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    Iowa
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    German springs are good. Japan makes fair springs. Indian springs are not good. Many suppliers will no longer tell you where they get their springs.
     
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