Snail adjustment

Discussion in 'Clock Repair' started by Bull, Apr 11, 2017.

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  1. Bull

    Bull New Member

    Apr 11, 2017
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    View attachment 339813

    How do you set snail and Rake

    Does it strake 1-12
    Or does it strack 1/4 hr

    Thanks for any help and advice in advance
     
  2. R. Croswell

    R. Croswell Registered User
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    Re: Setting snail on Seth Thomas 89

    Thisn looks like the 89L which I believe is a quarter striker. Set the minute hand to the top of the hour (straight up at "12") with the hour hand at 12 o'clock. Position the snail so the rack tail drops into the deepest slot on the snail. That should do it I believe.

    RC

    Here's a picture of an 89L for the benefit of those not familiar. Is this like your?
     
  3. R. Croswell

    R. Croswell Registered User
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    Looks like you have the same question posted in two different threads, see "Setting snail on Seth Thomas 89" Would also help to know for sure just which 89 you have as most 89s don't have snails. I'm guessing you have an 89L quarter striker perhaps.
     
  4. shutterbug

    shutterbug Moderator
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    I merged the two threads. It should strike the number indicated by the hour hand. Just hour and half hour (1 strike), not 1/4 hours.
     
  5. bangster

    bangster Super Moderator
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    ...unless it's like the one RC shows.:whistle:
     
  6. Bull

    Bull New Member

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    #6 Bull, Apr 11, 2017
    Last edited by a moderator: Apr 11, 2017
    Setting snail and rack

    Seth Thomas date 3-39 4505

    Can't make it struck 1 o'clock
    Will s track 12. Twice then two and then three
    Never 1 o'clock View attachment 339841 hooe this works this time
     
  7. wow

    wow Registered User
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    Re: Setting snail and rack

    You must move the snail one tooth. I believe, in your case, you need to move it clockwise one tooth.
     
  8. Bull

    Bull New Member

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    Re: Setting snail and rack

    Will try that
    Thanks having trouble posting pictures
    Sorry about so many posters
     
  9. R. Croswell

    R. Croswell Registered User
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    Re: Setting snail and rack

    What movement number is this? Never seen one just like it. I wonder what is the purpose of the of the deep step between the 1 and 2 step on the snail? I agree with Wow, if it strikes 12 twice, advancing the snail one tooth should fix that...... unless the rack tail ends up in that deep step instead of on the "1" step at 1 o'clock.

    RC
     
  10. THTanner

    THTanner Registered User
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    Re: Setting snail and rack

    I saw one similar to this, but not that deep and it seemed to have something to do with what happened when you turned the hands backwards. It did not cause a problem on the clock I was working on and I didn't spend a lot of time trying to figure it all out. As I recall, the cut had a more open angle toward the one o'clock ledge and had a sharp edge. This one looks like the tail could easily land in the cutout and cause the rack to be set to strike two o'clock instead of one.

     
  11. Willie X

    Willie X Registered User

    Feb 9, 2008
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    This is a General Time quarter striker (S -T licence). That highest short step on the snail is for the 1:00 count. The deep notch following is for the 12:30 and 12:45 quarter counts. The sensitive adjustment is to get the 1:15 to drop on the same step as the 1:00 while the 1:30 has to drop into the deep notch, same with 1:45.
    You may not notice but the 2:00 step is a little short also. This allows the 2:45 to actually drop onto the extended leading edge of the 3:00 step.
    At 3:00 and onward, there is plenty of room for the rack tail to do the quarters without any interference.
    Willie X
     
  12. Tinker Dwight

    Tinker Dwight Registered User

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    There are two levels of adjustment for the snails.
    The mesh between the hour wheel and the minute wheel
    is a coarse adjustment. It may not be fine enough
    to achieve the desired strikes.
    The mesh between the center shaft pinion and the minute
    wheel allows finer adjustment.
    Any thing finer would require either moving the star wheel
    bending the lifting lever. Both not desired.
    Tinker Dwight
     
  13. Willie X

    Willie X Registered User

    Feb 9, 2008
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    It's been a while since I've worked on one of these but I'm pretty sure there is a disk with pins on the minute shaft. These pins trip the strike every quarter and also controll the number of quarterly Bing Bongs at 1, 2, or 3 times.
    The rack is free to drop on the normal snail (visable in the photo) only on the hour. The contact point is just past the rack tail's first bend. At the quarters, the extra long angled tip of the rack tail lands on one of 3 pins of differing heights to controll the quarters. There is no pin at the hour so the rack drops fully onto the normal snail in the usuall manner at each hour.
    A good close-up photo of the area behind the snail would be nice, even better with the snail removed.
    Willie X
     
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