Seth Thomas Mantle Clock speed adjustment?

Discussion in 'Clock Repair' started by beachbum, Jan 17, 2013.

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  1. beachbum

    beachbum Registered User

    Feb 13, 2012
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    Hi all,
    I apologize for posting such a stupid question but I have a Seth Thomas Mantle clock - I got it mostly repaired (pretty simple stuff, replaced hands, glass, repaired the gong) and it keeps pretty good time.. mostly. It's losing a couple minutes a day and I see on the front (clock face) a hole with a post inside there and an s and f which I assume is where I adjust the speed however it looks like it takes a tiny key to fit over that post. Does anyone know if there is a key for this and if so what it's called? I tried adjusting it with a small pair of forceps but I'd like to get the replacement part (if there is one) and I'm kinda stuck on what to even call it. I know you're all probably shaking your heads at my stupidity but I got such great help with my last clock project I figured I'd bring it to the experts here cause I've been searching the internet and I'm stumped.

    Jonathan
     
  2. Scottie-TX

    Scottie-TX Registered User
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    Well; You're wrong. Not one is shaking his head at your stupidity. You're not stoopid and it's not what we do. I call 'em regulating keys altho someone else may arrive with a more proper name. TIMESAVERS sells them with a slot to attach to your key. They also sell double ended keys. For either of course, you'll need to know the arbor size across the flats to get the correct one.
     
  3. tom427cid

    tom427cid Registered User
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    Check in the cataloge-it will list a 6/4 specificly for the ST. I has a longer small end for clearance.
    Hope this helps.
    tom
     
  4. Jay Fortner

    Jay Fortner Registered User

    Feb 5, 2011
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    If it's an 89 movement the key size is #6/0000,if 48R movement #4/0000 and I think the 120 movement is #4/0000 as well.
    Tom types faster than me!
     
  5. Dch48

    Dch48 Registered User

    Jan 12, 2012
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    You can find reproduction double ended keys that even have the Seth Thomas logo on them. I got mine off eBay. Just search for clock keys or even just Seth Thomas.
     
  6. David S

    David S Registered User
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    I purchased some square brass tubing from a hobby place. They come in very small sizes and every 1/32" I think such that all the sizes telescope. I have often found that the smallest size makes a great key for this type of adjuster.
     
  7. shutterbug

    shutterbug Moderator
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    Timesavers # 10099 is the likely key for your clock if it's the 89. It includes both sizes you need. We can verify if you can get a measurement of the winding square for us.
     
  8. Jay Fortner

    Jay Fortner Registered User

    Feb 5, 2011
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    I'm surprised they don't offer that size in their trademark
    keys.
     
  9. shutterbug

    shutterbug Moderator
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    I think they do, Jay .... but they don't look right. That one has "the look" :)
     
  10. beachbum

    beachbum Registered User

    Feb 13, 2012
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    You guys are awesome! I was just coming in to post my next question but it looks to have been already answered. I found the double sided key on Timesavers but only one was listed in mm size (that I found) the clock is a number six key so the keys I found were 6/0, 6/00, 6/000 an 6/0000 and 6/00000 - then looking farther down I found 6/1.75 and 6/1.95. I gotta tell ya to a beginner this all looks pretty intimidating with so many choices. I was going to try ordering one of each of 0's and see which fits but I think I'll take all your advice here and order the long shaft (and maybe a regular shaft to have on hand) of the 6/0000. The shaft is far enough in that using forceps it's pretty rough to get a hold - but looking at it seems fairly close to the clock face - my question is now - for future reference. how do you measure something like that without having to remove the hands and the face? or in this case since i cant see a way to remove the face - the entire clock work and is there a chart that says what the mm for each size is? Does that make sense? I guess i'm wondering the size difference in mm between the /000 and the /0000 (and the other sizes as well and how to accuratly measure something like that - or do you find it best to make your best guess ad order extra keys if you run into a clock you don't know the size of?

    I have to say this is my 3rd clock that I've worked on and I'm finding this all really enjoyable. I find myself looking forward to finding other ones - though I also have to say i've been really REALLY lucky both to find this forum and to find clocks that so far only have very minor problems to get them running again.
     
  11. Jay Fortner

    Jay Fortner Registered User

    Feb 5, 2011
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    #11 Jay Fortner, Jan 19, 2013
    Last edited: Jan 19, 2013
    You may be able to use a set of dividers and adjust them so they reach in and slide down over the flats of whatever arbor you're trying to measure then measure the inside of the points with a caliper.

    I'm hoping the mods will post this up on one of the stickies for future reference;

    All sizes in mm starting from small to large
    Key size........ American............ Swiss
    5/0.................. 1.6...................1.25
    4/0.................. 1.8 ..................1.5
    3/0.................. 2.0.................. 1.75
    2/0.................. 2.2.................. 2.0
    0...................., 2.4 ..................2.25
    1..................... 2.6.................. 2.5
    2..................... 2.8.................. 2.75
    3..................... 3.0.................. 3.0
    4..................... 3.2...................3.25
    5..................... 3.4.................. 3.5
    6..................... 3.6.................. 3.75
    7..................... 3.8.................. 4.0
    8..................... 4.0.................. 4.25
    9..................... 4.2.................. 4.5
    10................... 4.4 ..................4.75
    11................... 4.6.................. 5.0
    12................... 4.8.................. 5.25
    13................... 5.0.................. 5.5
    14................... 5.2.................. 5.75
    15................... 5.4.................. 6.0
    16................... 5.6.................. 6.25
    17................... 5.8.................. 6.5
    18................... 6.0.................. 6.75
    19................... 6.2.................. 7.0
    20................... 6.4.................. 7.25
    21................... 6.6.................. 7.5
    22................... 6.8.................. 7.75
    23................... 7.0.................. 8.0
     
  12. beachbum

    beachbum Registered User

    Feb 13, 2012
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    Thanks Jay! I've coppied and pasted that info into my word program so I can keep it handy for future clock key buying. Sounds like a great way to measure also!

    Thanks again everyone :)

    -Jonathan
     
  13. shutterbug

    shutterbug Moderator
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    I did the same. Thanks, Jay. Love it when someone does the work for me :D
     
  14. Jay Fortner

    Jay Fortner Registered User

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    Yeah, I've never worked on anything with a #23 key,I'd be tempted to just grab a socket and ratchet.
     
  15. shutterbug

    shutterbug Moderator
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    That's a big one! Seems that the German Time Bomb uses one about that size.
     
  16. harold bain

    harold bain Registered User
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    Time recorders, Jay.
     
  17. bangster

    bangster Moderator
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  18. Jay Fortner

    Jay Fortner Registered User

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    Must have springs in them big enough to hold up a truck.
     
  19. Jay Fortner

    Jay Fortner Registered User

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  20. shutterbug

    shutterbug Moderator
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    Jay, how about a picture? I'm not sure what 'dividers' would be :)
     
  21. Robert Cahill

    Robert Cahill New Member

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    My seth thomas mantle clock back has a plus and a minus with two small holes nexit to them. How do I adjust the speed of the clock? Do I need a special key? Robert
     
  22. shutterbug

    shutterbug Moderator
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    There should be one place to adjust + or -, not two. Usually those clocks have a special key with a small end and a larger end. Something like this would get you to the adjuster size, but one of these would work too, if we knew the size you needed.
    Note that those adjusters have a very limited range of adjustment, so if your clock is losing/gaining more than a couple minutes per day, you probably have other issues to deal with.
    If you look into the back of the clock, on the top of the movement will be a very small gear that the adjusting key turns. You can move it by hand if you can get to it.
     

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