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  1. #1

    Default Urgos Pendulum Length - I want to Change it

    Good afternoon. Noob here with a question regarding pendulum length for an Urgos grandfather clock movement. More specifically, I’d like to swap out a 100 cm pendulum with a 114 cm pendulum and I need to know what mods I would need to make to the movement to make it run properly?
    Am I correct in assuming I simply need to replace the escapement wheel with one that matches the new pendulum?
    I have two pendulums now (one at each length) and the only difference between the two is the length of the neck piece.
    Thank you.
    Mark
    Last edited by Torre; 05-09-2017 at 11:35 AM.

  2. #2

    Default Re: Urgos Pendulum Length - I want to Change it (By: Torre)

    Changing the EW is one approach. It would probably be better to find a movement made for the longer pendulum.
    A man with a clock always knows the time. A man with two clocks is never sure.

  3. #3
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    Default Re: Urgos Pendulum Length - I want to Change it (By: shutterbug)

    You need to change the number of teeth someplace.
    Changing the escapement wheel tooth count requires
    changing the anchor to match.
    Tinker Dwight

  4. #4

    Default Re: Urgos Pendulum Length - I want to Change it (By: Torre)

    The escape wheel is the one thing that never changes. In this movement the 2nd wheel is what is changed.

  5. #5

    Default Re: Urgos Pendulum Length - I want to Change it (By: Torre)

    What movement? Unless you have a nearly new movement the parts will not be available (except from old scrap movements). Urgos has been gone for probably 15 (?) years, taken over by Hermle. Hermle has redesigned the present movements to use mostly Hermle parts.
    Bugs approach would probably be your best option, buy an identical movement made for the 114cm pendulum and either use it, or transfer the needed parts to your original movement. This could be 1 to 4 parts (?) and there are variations. No company makes the exact same movement for very long, even though the main identifier numbers may remain the same for many years. The UW03 and UW32 go back to the late 1950s, and the UW66 series goes back to the mid 1980s, hundreds of changes have been made along the way.
    So, your job may be fairly easy or maybe not ...
    Willie X

  6. #6

    Default Re: Urgos Pendulum Length - I want to Change it (By: Torre)

    We actually have a stock of the original UW03 series 2nd wheels [as well as chain wheels] if anyone is interested.

  7. #7
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    Default Re: Urgos Pendulum Length - I want to Change it (By: Torre)

    Quote Originally Posted by Torre View Post
    Good afternoon. Noob here with a question regarding pendulum length for an Urgos grandfather clock movement. More specifically, I’d like to swap out a 100 cm pendulum with a 114 cm pendulum and I need to know what mods I would need to make to the movement to make it run properly?
    Am I correct in assuming I simply need to replace the escapement wheel with one that matches the new pendulum?
    I have two pendulums now (one at each length) and the only difference between the two is the length of the neck piece.
    Thank you.
    Mark
    Mark, why do you want to lengthen the pendulum?

    David
    David S

  8. #8
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    Default Re: Urgos Pendulum Length - I want to Change it (By: David S)

    If you put a weight at 1/2 the effective length of the pendulum.
    of about 7% of the bobs weight, it should speed the
    pendulum up by about the right amount.
    The effective length is about from the center of the suspension
    spring to the center of the bob.
    So, say you had a 3 lbs bob, you'd add a 3.4 oz weight.
    Tinker Dwight

  9. #9

    Default Re: Urgos Pendulum Length - I want to Change it (By: Torre)

    Along the line of Tink's thinking, making a new top piece from 1/4" brass stock would be easily doable. Just remember that it will need to be longer by (??).
    Willie X

  10. #10
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    Default Re: Urgos Pendulum Length - I want to Change it (By: Willie X)

    I should note that adding the weight at the center ( 1/2 way ) is
    the most effective way to speed up a pendulum.
    Other locations take larger amounts of weight.
    This still assumes a simple pendulum. A pendulum with other weight
    distributions may have other maximal effect points.
    I could show the math if anyone is interested.
    Tinker Dwight

  11. #11

    Default Re: Urgos Pendulum Length - I want to Change it (By: Torre)

    Thank you for all the replies.
    First of all the movement is a UW03042B – 9 bell movement taken from a crappy 80’s vintage Emperor clock. I also have a 1980 Sligh Centennial which has the same movement but stamped UW03052B and it has the longer pendulum. I’m assuming that is the reason for the “5” vs the “4” in the model number?
    If I put the longer pendulum on the movement in question it will simply stop after a few minutes.
    I have considered the idea of reducing the weight of the bob to see what happens. I actually have a Hermle pendulum at the correct length with a smaller bob. It should hang on the leader OK for a test.

    As for why I want to do this? I found this beat up Emperor about a year ago and removed the movement. After cleaning it and replacing a weight cable, it has run flawlessly on a stand for a year. Fast forward to now and I acquired a beautiful limited edition 1985 vintage Howard Miller “Charleston Manor” which is a big clock with an unusually tall cabinet and glass door. It too had an Urgos but a simple rod chime version. I was able to swap movements and keep the original dial of the “Charleston Manor”. The clock runs great but the pendulum is too short so it looks strange in that tall cabinet. Photo attached.


    Incidentally, I did this same exercise a couple of years ago with a newer Hermle – 9 bell movement taken from a crappy Colonial Times clock. I put it in a beautiful Ridgeway “Victory at Yorktown” cabinet. The bells barely fit into the narrow wasted cabinet but it was a success and one of my favorite clocks now. (another photo attached).


    Thank you again,
    Mark
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  12. #12
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    Default Re: Urgos Pendulum Length - I want to Change it (By: Torre)

    The movement stopping with the longer pendulum is
    not a fault of the pendulum.
    It may not be in beat.
    The movement may be marginal in running.
    The connection between the pendulum and the leader
    may not be solid.
    And such.
    Tinker Dwight

  13. #13

    Default Re: Urgos Pendulum Length - I want to Change it (By: Tinker Dwight)

    Quote Originally Posted by Tinker Dwight View Post
    The movement stopping with the longer pendulum is
    not a fault of the pendulum.
    It may not be in beat.
    The movement may be marginal in running.
    The connection between the pendulum and the leader
    may not be solid.
    And such.
    Tinker Dwight
    You are correct in that it was simply out of beat.
    I tried the longer pendulum again yesterday. Set it in beat and it has been running for over 24 hrs. at approx. 5 seconds slow per minute.
    I am going to try your center weight (10% bob weight) idea over the weekend and see what happens.
    Thanks again,
    Mark

  14. #14

    Default Re: Urgos Pendulum Length - I want to Change it (By: MARK A. BUTTERWORTH)

    Quote Originally Posted by MARK A. BUTTERWORTH View Post
    We actually have a stock of the original UW03 series 2nd wheels [as well as chain wheels] if anyone is interested.
    I actually have a UW03 movement which used the 116 cm pendulum. I could steel the wheel from it.
    Do you think these wheels would fit any 03 (B) series movements?
    Thanks

  15. #15

    Default Re: Urgos Pendulum Length - I want to Change it (By: Torre)

    Quote Originally Posted by Torre View Post
    I actually have a UW03 movement which used the 116 cm pendulum. I could steel the wheel from it.
    Do you think these wheels would fit any 03 (B) series movements?
    Thanks
    they should. The one difference could be in the diameter of the shaft going through the front plate, but a bushing will solve that.

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