clock identfication

Discussion in 'Wood Movement Clocks' started by Greg B, Jul 26, 2011.

  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  1. Greg B

    Greg B Registered User

    Jul 26, 2011
    5
    0
    0
    Sslf/ security
    Sausalito Ca USA
    Country Flag:
    I'm new to clocks and find wood movements interesting. How do I tell a 30 hr movement from an 8 day? I understand that 8 day Wood movements are not common. Greg
     
  2. laumeg

    laumeg Registered User

    Jan 22, 2011
    568
    6
    18
    Retired, health care
    Houston, Texas
    Country Flag:
    Region Flag:
    Hi, Im probably not the most expert on this, but can add some light.
    1. 8 day movements, both wood and brass require heavier weights than do 30 hr. 8 day movements require weights of roughly 8 lbs each, where 30 hr movement weights are about 3 lbs. each.

    2. 8 day movements often require that the weight drope a greater distance than with 30 hr clocks. These clocks have taller cases and often are called tripple deckers, since they have 3 sections and sometimes 3 doors as apposed to 2.

    These 2 probably compose the most easily observed observations outside of looking at the movement itself. Hope this helps. Charles
     
  3. Greg B

    Greg B Registered User

    Jul 26, 2011
    5
    0
    0
    Sslf/ security
    Sausalito Ca USA
    Country Flag:
    Thanks, that helps. I did see something about converting a 30 hr to 8 day by putting a larger dia spool(?) for the weight cord to warp around. Greg
     
  4. Jerome collector

    Jerome collector Registered User
    NAWCC Fellow NAWCC Member

    Sep 4, 2005
    812
    54
    28
    Geologist, US Army Corps of Engineers
    Omaha, NE
    Country Flag:
    Region Flag:
    8-day wood works movements use compound pulleys. Also, they typically have a smaller (not larger) winding drum than 30-hr movements. The distance between the plates is also larger for 8-day movements, although this is not obvious when the movement is in the case.
    Mike
     
  5. Watchfixer

    Watchfixer Registered User

    Jun 11, 2011
    1,198
    0
    0
    TV repair tech.
    Country Flag:
    Region Flag:
    Could one explain why the 31 day movements only need lighter weight vs the 8 day that needs much heavier weights?

    Cheers, Watchfixer
     
  6. harold bain

    harold bain Registered User
    NAWCC Member Deceased

    Nov 4, 2002
    40,850
    143
    63
    Male
    deceased
    Whitby, Ontario, Canada
    Country Flag:
    Region Flag:
    If you are thinking of the Oriental 31 day movements, the weights are only decoration, and are non-functional. These are spring driven.
     
  7. Greg B

    Greg B Registered User

    Jul 26, 2011
    5
    0
    0
    Sslf/ security
    Sausalito Ca USA
    Country Flag:
    Thanks again, great site. When you say compound pulley do you mean with pulleys at the top of the case and/or a pulley on the weights. Greg
     
  8. Jerome collector

    Jerome collector Registered User
    NAWCC Fellow NAWCC Member

    Sep 4, 2005
    812
    54
    28
    Geologist, US Army Corps of Engineers
    Omaha, NE
    Country Flag:
    Region Flag:
    That's right: pulley at the top and pulley at the weight.
     
  9. Uhralt

    Uhralt Registered User
    NAWCC Member

    Sep 4, 2008
    3,851
    384
    83
    Country Flag:
    Region Flag:
    This sounds like a misunderstanding. The 30 HOUR movements need less weight than the 8-day movements. 31 DAY movements were not discussed and as Harold said, are usually spring-driven. Weight-driven ones would need heavier weights than 8-day movements.

    Uhralt
     

Share This Page