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  1. #1

    Default Ansonia Round Movement - Original Mainspring

    Hello, I have a round Ansonia movement from a Royal Bonn clock. I am replacing a mainspring (that is not original) and I would like to find out what the original mainspring sizes were for this movement. Does anyone have this in their records?
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  2. #2
    Registered user. roughbarked's Avatar
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    Default Re: Ansonia Round Movement - Original Mainspring (By: MuensterMann)

    You haven't tried measuring the original?

    Somebody made a real mess of that back plate.

  3. #3

    Default Re: Ansonia Round Movement - Original Mainspring (By: roughbarked)

    Yes, I have measured what is on this clock now. However, I would like to know if anyone has the original measurements - since what is on this clock now are not the originals. Instead of loop ends, they used hole ends and attached to the posts via wire. Thanks!

  4. #4
    Registered user. roughbarked's Avatar
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    Default Re: Ansonia Round Movement - Original Mainspring (By: MuensterMann)

    I see., now.

  5. #5

    Default Re: Ansonia Round Movement - Original Mainspring (By: MuensterMann)

    They look about right. Will the clock run in this condition? If yes, let it run to see how these springs work. If they work OK, just get loop end springs of the same dimensions.
    That looks like a crack on the 7th coil in, just beneath your thumb.
    Willie X

  6. #6

    Default Re: Ansonia Round Movement - Original Mainspring

    Well, the one broken spring (yes, one of them was broken) seems to be .44 inches wide, a thickness of .012 or .013, and a length of 106 inches. I wonder how close this is to the original.

    I do not find anything close to this size out in the market!
    Last edited by MuensterMann; 04-08-2017 at 08:57 PM.

  7. #7

    Default Re: Ansonia Round Movement - Original Mainspring (By: MuensterMann)

    I am hoping that what I have is way off - since I cannot find that size mainspring. Save me!

  8. #8

    Default Re: Ansonia Round Movement - Original Mainspring (By: MuensterMann)

    Upon re-measurement I found that I made a mistake in saying the length was 106 inches. It is really about 80 inches (I had to add two broken pieces).

    Thus, the present mainspring (not original to the movement, since it is hole end) is 7/16 inches wide (11mm) x .12 or .13 inches thickness x 80 inches length. I could not find this size mainspring. However, there is a 9mm wide, .012, x 83 inch loop end. Would 9mm width instead of 11mm width be a problem for me?

    Otherwise, there is a hole end that is 10mm wide x .012 thickness (strength) x 73 inches long. In this case I would have to do what the last repairman did to attach the mainspring to the post.

    Help!

  9. #9
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    Default Re: Ansonia Round Movement - Original Mainspring (By: MuensterMann)

    Why not anneal the spring and wrap it around the post.
    You have two options. You can punch a hole and rivet it
    or have a tail that tucks under the last 1/2 turn of the
    spring and then wraps around the post.
    It will keep the spring from coming off.
    Tinker Dwight

  10. #10

    Default Re: Ansonia Round Movement - Original Mainspring (By: Tinker Dwight)

    Tinker, are you referring to the reuse of the spring I have? If so, it is broken with the longest piece being 55 inches.

  11. #11
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    Default Re: Ansonia Round Movement - Original Mainspring (By: MuensterMann)

    Quote Originally Posted by MuensterMann View Post
    Tinker, are you referring to the reuse of the spring I have? If so, it is broken with the longest piece being 55 inches.

    Well then,
    hunt for a spring with the right thickness and width.
    Don't worry about the end.
    I have one clock with the end folded as I described
    it works fine but waste some of the length.
    Tinker Dwight

  12. #12

    Default Re: Ansonia Round Movement - Original Mainspring (By: Tinker Dwight)

    The present mainspring (not original to the movement, since it is hole end) is 7/16 inches wide (11mm) x .12 or .13 inches thickness x 80 inches length. I could not find this size mainspring. However, there is a 9mm wide, .012, x 83 inch loop end. Would 9mm width instead of 11mm width be a problem for me?

  13. #13
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    Default Re: Ansonia Round Movement - Original Mainspring (By: MuensterMann)

    You could try it but watch for it jamming at
    mid wind where the spring would tend to come
    out sideways.
    Tinker Dwight

  14. #14

    Default Re: Ansonia Round Movement - Original Mainspring (By: Tinker Dwight)

    New information! The remaining mainspring has a crack and it is ready to break complete. It seems that this is the original spring with a loop end. The length is indeed 105 inches, the width is 11mm, and the strength is .012 inches. Where can I find this size mainspring? Or, something close that will work? Or, is there a modern movement that I can substitute? I notice that older Royal Bonn movements were not round and the round ones are hard to find. HELP!

  15. #15
    Registered user. THTanner's Avatar
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    Default Re: Ansonia Round Movement - Original Mainspring (By: MuensterMann)

    I would find the closest I could get new, loop or hole, that is the same width, strength and a bit longer than 105. then cut it down to size, anneal the end and create a loop.

    Quote Originally Posted by MuensterMann View Post
    New information! The remaining mainspring has a crack and it is ready to break complete. It seems that this is the original spring with a loop end. The length is indeed 105 inches, the width is 11mm, and the strength is .012 inches. Where can I find this size mainspring? Or, something close that will work? Or, is there a modern movement that I can substitute? I notice that older Royal Bonn movements were not round and the round ones are hard to find. HELP!
    You miss 100% of the shots you don't take. - The Great One

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