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  1. #1
    Registered User Douglas Ballard's Avatar
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    Default Rack Won't Advance

    Hello,
    Working on one of my Gustav Becker weighted clocks. The rack won't advance on the hour, it does on the half hour. This does not happen every time but more frequently than not. Any advice appreciated. Here is a YouTube link:
    https://www.youtube.com/watch?v=ceAK...m-upload_owner
    TEMPVS RERVM IMPERATOR

  2. #2
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    Default Re: Rack Won't Advance (By: Douglas Ballard)

    To me it looks like the rack is not pulled far enough to the right to advance it one tooth. Could be the pin on the rotating part (excuse my lack of terminology) could be bent in enough which is not pushing the rack far enough to the right thus not allowing the big lever above to advance a tooth. Just my opinion though

  3. #3
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    Default Re: Rack Won't Advance (By: Jasons34)

    Don't try to bend the pin. They are usually hardened and will
    just snap.
    The more likely is needing a bushing on the gathering pallet's arbor.
    Tinker Dwight

  4. #4
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    Default Re: Rack Won't Advance (By: Tinker Dwight)

    If it is the bushing you should be able to test by shoving the arbor over with something like a steel scale to get more engagement while it is trying to gather.

    David
    David S

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    Default Re: Rack Won't Advance (By: David S)

    Just a question but why would the pin be hardened when there is no reason for it to be? There is no load on that pin like there is with a pivot.

  6. #6
    Registered User Douglas Ballard's Avatar
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    Default Re: Rack Won't Advance (By: Jasons34)

    I will take a look at the gathering pallet arbor and report back.
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    Default Re: Rack Won't Advance (By: Jasons34)

    Quote Originally Posted by Jasons34 View Post
    Just a question but why would the pin be hardened when there is no reason for it to be? There is no load on that pin like there is with a pivot.

    Don't know but I've seen them snapped off.
    Tinker Dwight

  8. #8
    Registered User Douglas Ballard's Avatar
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    Default Re: Rack Won't Advance (By: Tinker Dwight)

    Does not seem to be an slop in the gp arbor . . .
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  9. #9
    Registered user. gleber's Avatar
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    Default Re: Rack Won't Advance (By: Douglas Ballard)

    Is the spring at the bottom too strong?

    Does the rack rotate freely by hand? Is anything blocking it?

    Is the rack tooth or teeth damaged?

    Tom

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    Default Re: Rack Won't Advance (By: Douglas Ballard)

    I just saw the video ( didn't work an my other computer ).
    The GP looks like it may have been a replacement. The long
    pin is not likely original.
    The rack hook looks to have been adjusted near the pointed end.
    It is possible that someone ( for what ever reason ), bent it
    a little to the right.
    It looks like someone was at it with a pair of pliers.
    You might examine how it lands in the teeth of the rack when
    sampling the snail.
    You might also look at how much clearance the GP's pin has
    from the tip of the rack teeth when it first engages the rack teeth.
    It should first engage near the tip of the tooth but not so close
    that it might jam.
    I suspect you'll see it engages part way down the tooth, also indicating
    the rack hook is incorrect.
    Since I can't see these parts in the video, you'll have to investigate
    by slowly running the strike and using a small mirror.
    Tinker Dwight

  11. #11
    Registered User Douglas Ballard's Avatar
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    Default Re: Rack Won't Advance (By: gleber)

    Spring appears to be original and not too strong. The rack does rotate freely by hand, does not appear to be block by anything. Don't see any damage to rack teeth.

    Quote Originally Posted by gleber View Post
    Is the spring at the bottom too strong?

    Does the rack rotate freely by hand? Is anything blocking it?

    Is the rack tooth or teeth damaged?

    Tom
    - - - Updated - - -

    Tinker, thanks for posting things to look for. Will be doing that today.
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    Default Re: Rack Won't Advance (By: Douglas Ballard)

    My thinking is that the rack hook tip was bent in an attempt
    to correct for the rack tail not being set right. This would reduce the amount
    of movement the GP was applying to the rack and not moving it far
    enough to move the rack hook to the next tooth.
    It may also be that the pawl of the GP is warn down so much that
    it is not moving the rack as far as it should.
    There is also, the thought that the GP is a replacement and the pawl
    part that moves the rack was inadvertently filed down too much.
    Seeing the damage to the tip of the rack hook could be any one of these
    issues or even a combination of them.
    Tinker Dwight

  13. #13

    Default Re: Rack Won't Advance (By: Tinker Dwight)

    It looks to me like the gp is not advancing the rack. It could be that it's been filed, or replaced, as Tinker said.
    A man with a clock always knows the time. A man with two clocks is never sure.

  14. #14
    Registered user. shimmystep's Avatar
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    Default Re: Rack Won't Advance (By: shutterbug)

    Agree where folk mention the gathering pallet. The nib of the GP is disengaging before it has moved the rack far enough along to allow the rack hook to drop into the next tooth.
    As Tinker has pointed out, the rack hook has been bent.This bend will not have made any beneficial change to synchronising. I think if you bend the tip of the rack hook back a fraction, it will fall into the next tooth as it is designed to do.
    shimmystep.

  15. #15
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    Default Re: Rack Won't Advance (By: shimmystep)

    My thinking is that you could rotate the GP by hand.
    Lift the rack hook or tie it out of the way.
    See how far to the left you can practically have the rack and still
    safely catch a tooth without catching.
    Mark the position of the rack so that you can repeat it.
    Move the end of the rack hook so that it holds it in this position.
    Check the rack tail and snail to get the rack to fall such that the
    rack hook is close to the center of a valley when released.
    Of course check that the count is right. If not, change the
    angle of the rack tail.
    Tinker Dwight

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