Sessions Electric Westminster Clock

Discussion in 'Clock Repair' started by hookster, Jan 3, 2016.

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  1. hookster

    hookster Registered User
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    Jan 14, 2011
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    I just overhauled a Sessions Westminster Electric clock, likely from the 30s. It is the type that was converted from the wind up, mainspring driven, one written up in Steven Conover's book, Chime Clock Repair. It has two synchronous motors, one to work the time and the other to work the strike and chimes. The original insulation was worn, so I rewired both motors and provided added insulation, as well as doing the normal servicing of all mechanical parts. It is back in the case and running fine. I have noticed that both motors get warm, but certainly not hot to the touch. Is this normal? Thanks for any input that can be provided.
     
  2. harold bain

    harold bain Registered User
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    Nov 4, 2002
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    Synchronous motors do generate heat as they work, so yes, it is normal.
     
  3. hookster

    hookster Registered User
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    Thanks Harold. I rarely work on these, and want to be cautious from a safety point of view as they do appear to run on a full 120 volts, and are non grounded. As an aside, the movement was completely caked with old dried up WD-40 when I took it in, but luckily not the motors. PS. 'Happy New Year' to you and yours.
     
  4. Tinker Dwight

    Tinker Dwight Registered User

    Oct 11, 2010
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    Most all of these synchronous motors get hot.
    They usually use from 3 to 5 watts of power AC.
    It obviously doesn't require that much to run a clock
    so that power goes someplace as heat.
    If they don't get warm, they are broken.
    Tinker Dwight
     
  5. hookster

    hookster Registered User
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    Thanks Tinker. Also has a slight 'thumping' noise from the time motor. Again, is this normal? By the way, I had an old dead motor of this type in my junk pile. I just took it apart and noticed that the coil wire is extremely thin, so it obviously doesn't carry a lot of juice.
     
  6. hookster

    hookster Registered User
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    Just figured it out. The rotating outer disk was a bit loose. Put a dab of Loctite on it. Thumping sound gone.
     
  7. David S

    David S Registered User
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    Dec 18, 2011
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    Loctite? Loctite? Is my malware software not working :). Just kidding, I love the stuff and Happy New Year Hookster.

    David
     
  8. hookster

    hookster Registered User
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    Yepp, great stuff. As the old Brylcream ad used to say 'A Little Dab'il Do Ya'. Happy New Year to you as well. Hope to see you at our next Toronto Chapter meeting in May.
     
  9. bruce linde

    bruce linde Technical Admin
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    can someone point me toward a tutorial on how to do that?
    thx,
    b
     
  10. shutterbug

    shutterbug Moderator
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    If you lose the inside coil wire, you're sol. The outer one can sometimes be fished out and reconnected.
     
  11. bruce linde

    bruce linde Technical Admin
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    ok, i've got the thing running... some of the wiring is just barely hanging on, though.

    i guess i don't fully understand how it works... the lower coil seems a bit far away from and not attached to the gear that drives the time side... how is that working?
     
  12. Uhralt

    Uhralt Registered User
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    Pictures?

    Uhralt
     
  13. bruce linde

    bruce linde Technical Admin
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    i will post photos mañana... thx...
     

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