Gilbert calendar clock

Discussion in 'Clock Repair' started by Kevin W., Apr 13, 2020.

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  1. Kevin W.

    Kevin W. Registered User
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    Apr 11, 2002
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    I work at the Veritas Tools machine shop.
    Nepean, Ontario, Canada
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    I just overhauled on Gilbert school house clock. The calendar hand advances . When i try to push the minute hand it wont move. I have another Gilbert calendar clock, which i have not touched. It has the same problem. I cant see or understand why this is happening. I will check too in a few repair books to try and find a diagram or some other help about this.
     
  2. Uhralt

    Uhralt Registered User
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    Look for a frozen clutch.

    Uhralt
     
  3. Willie X

    Willie X Registered User

    Feb 9, 2008
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    There is a 2:1 gear reduction gear that has a pin to activate the calander wheel. This pin can posibably go point to point with the 31 tooth calendar gear. The solution would be to check the calander location spring to see if it is controling the 31 tooth calandar wheel properly. If the location spring is properly adjusted the 'point to point' deal will never happen.

    I'm assuming you have checked the operation of the minute hand clutch.

    Willie X
     
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  4. Kevin W.

    Kevin W. Registered User
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    Apr 11, 2002
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    Thanks for the replies, i will check this out, not exactly sure what part is the clutch? I will get back to it in a while, going to work soon.
     
  5. Kevin W.

    Kevin W. Registered User
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    Apr 11, 2002
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    Could someone point to a diagram showing the clutch for this movement? Thanks.
     
  6. Uhralt

    Uhralt Registered User
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    If you show us pictures of the movement, front, sides and back, we would probably be able to locate the clutch.

    Uhralt
     
  7. Willie X

    Willie X Registered User

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    The clutch action is between the small but thick spur gear directly behind the larger thin hour cannon gear and the larger thick gear behind it. This can be varied somewhat by increasing or decreasing the pressure applied by the spider washer directly behind the larger gear (just mentioned).

    Just take the movement out and watch this area as you rotate the minute hand. With a little studying all should become obvious.

    Willie X
     
  8. Kevin W.

    Kevin W. Registered User
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    Apr 11, 2002
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    Thats the problem, i cant rotate the minute hand.
     
  9. Kevin W.

    Kevin W. Registered User
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    Apr 11, 2002
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    I work at the Veritas Tools machine shop.
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    When i put pressure on the minute hand it will make the escape work, but i cant set the time. Will have to look at this again when i have more time.
     
  10. shutterbug

    shutterbug Moderator
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    Gilbert's are famous for cracked pinion gears (between the plates on the minute arbor). Normally this causes the hands to flop around uncontrolled, but can also cause the gears to lock up. In those clocks, the clutch is often behind that pinion gear. I hope your problem is much simpler than that, but it wouldn't hurt to look closely at that area to see how the gear teeth are meshing.
     
  11. Kevin W.

    Kevin W. Registered User
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    Apr 11, 2002
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    Thanks Shutt if the pinion was cracked, would the clock still keep time?
     
  12. shutterbug

    shutterbug Moderator
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    Good question. No, I think that would hose up the works. Must be the clutch ;)
    It still might be between the plates though. Let us know what you see.
     
  13. Kevin W.

    Kevin W. Registered User
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    Apr 11, 2002
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    Thanks again Shutt, its a strange problem i think.
     
  14. Kevin W.

    Kevin W. Registered User
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    Apr 11, 2002
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    Hello again. Here is a update on the problem i had. So i spent a while looking over the movement, trying to see if anything was binding. Could not see anything. So got ready to split the plates, restrained the m spring and let down the power. Just for the heck of it i tried the minute hand again.This time i was able to move it with my finger. So i fully wound the m spring and tried to move the minute hand again. It moved okay. So i really dont know what did stop it .
     
  15. shutterbug

    shutterbug Moderator
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    Strange! Glad it freed up though :)
     
  16. Kevin W.

    Kevin W. Registered User
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    Apr 11, 2002
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    I work at the Veritas Tools machine shop.
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    Thanks Shutt. I have another Gilbert, calendar movement, same problem, hope it will be easy to get going again. It needs a tear down, clean and oil. Perhaps that will help it.
     

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