30 hour or 8 day wooden works

Discussion in 'Wood Movement Clocks' started by Frederick, May 20, 2015.

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  1. Frederick

    Frederick Registered User

    May 24, 2003
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    Thanks to those who responded to my WW movement weights question. I have another question. The Hoadley movement (most likely) I have is apart. Before I send it out, and regarding the weights, how can I tell if it is a 30 hour or 8 day?

    Thanks. Fred


     
  2. R. Croswell

    R. Croswell Registered User

    Apr 4, 2006
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    I know of no simple way to tell by just looking unless you had and 8-day and a 30-hour side by side. 8-day clocks often have an additional wheel and pinion but may just have larger wheels. You can verify the runtime mathematically with some effort. Begin by finding the pendulum rate from a rate table or the pendulum formula, then counting teeth in the escape wheel determine how many times it will rotate in a 24 hour period, then count the gear ratios of the time train and determine how many times the main wheel (and the winding arbor) will rotate in 24 hours. If the main wheel turns several times in a 24 hour period you have a 1-day or 30-hour clock. The main wheel is limited in how many times it can rotate before the cord spool is full (only allow a single layer).


    When the clock is together and running it will be obvious whether the weights have any room left to fall after 24 hours. If it runs on less than 4 lbs. then it is likely a 30-hour clock, but be careful - if it is a 30-hour clock with pivot and bushing issues it may not run on 4 lbs. but might run on 8lbs. briefly before shedding teeth from the wheels.

    RC
     
  3. john e

    john e Registered User

    Apr 23, 2015
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    "before shedding teeth"..

    Makes it sound so, "pleasant". What a nice way of putting it. I like it...;)


    John
     
  4. Jim DuBois

    Jim DuBois Registered User
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    #4 Jim DuBois, May 20, 2015
    Last edited: May 20, 2015
    Fred, photos of what you have would be very useful in answering your question. Right now I don't know if you have a shelf clock or a tall clock. It makes a difference! There are clues that could be ascertained from photos that might well allow one of us to assist in providing you with a good answer.....Hoadley 8 day shelf clocks in wood works are not common. Here are a couple of Hoadley tallclock photos, front of a 30 hr and back of an 8 day. Not real helpful but either is pretty easily identifiable. hoadley 30 hr ft.jpg hoadley 8 day.jpg
     
  5. Tinker Dwight

    Tinker Dwight Registered User

    Oct 11, 2010
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    Although, RC makes it sound difficult, you only need to count
    teeth between the minute shaft and the winding drum.
    You'd need the diameter of the drum as well.
    You don't need to now the pendulum rate or count all the teeth,
    just those between the minute shaft and the drum.
    If more than one wheel, all the pinion and wheels.
    The calculations are not hard and if you post your values,
    we will be able to tell you what you want to know.
    Tinker Dwight
     
  6. R. Croswell

    R. Croswell Registered User

    Apr 4, 2006
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    In deed that is a simpler better way!

    RC
     
  7. Tinker Dwight

    Tinker Dwight Registered User

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    Being a recoil, it will most likely run, fast, without a pendulum
    attached.
    One can let it run for 15 mins on the dial and measure
    how far the weight has fallen.
    Multiply that distance 96 to get the distance in a day.
    I tend to be more an## and would count the teeth.
    Tinker Dwight
     
  8. john e

    john e Registered User

    Apr 23, 2015
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    Remove the pallets, pull down by hand, go for a full round of minute hand. Mult by 24.

    John
     
  9. Tinker Dwight

    Tinker Dwight Registered User

    Oct 11, 2010
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    With reduced weight I hope.
    Tinker Dwight
     
  10. Frederick

    Frederick Registered User

    May 24, 2003
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    Thank you gentlemen. From Jim's pictures, I am sure my Hoadley tall case movement is 30 hour. Will proceed on that
    knowledge.
    Fred....
     
  11. Jim DuBois

    Jim DuBois Registered User
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    front view of an 8 day Hoadley Scan0121.jpg
     
  12. john e

    john e Registered User

    Apr 23, 2015
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    Hey, go easy on me. I am on a diet, it's just not showing yet..I have big bones..

    No weight, just by hand. And yah, it is important to not go crazy on the spin rate.

    John
     

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