[Jewelry making - Article 00131] - Re: [Orchid] Noisy Clock

[Ian W. Wright]

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>     My wife just got a nice big new alarm clock with a good ol'
>     fashioned round face with hands that go around in a circle just
>     like a clock 'sposed to do. Only trouble is, gee whiz, it goes tick
>     tick tick all night and day just like good ol' fashioned mechanical
>     clocks used to do, 

Hi Marty,

    Just because the clock is battery powered doesn't mean it won't
    tick. The difference is that the tick in this case is caused by the
    motor driving the gear train. The way these quartz movements work is
    that they have a very simple stepper motor which spins half a turn
    each second. They fly round the half turn turning the rest of the
    gear train and then stop suddenly - so, when they stop, all the rest
    of the gears want to keep going because of centripetal force and
    consequently, as they are made to stop, their teeth bang together
    just like a railway train of empty wagons when it starts or stops.
    This is the 'tick' each second. In most clocks it isn't a problem
    because the quartz movement is usually isolated from the case by a
    rubber gasket and the cases are often fairly solid. However, if you
    have a big tin or plastic alarm clock it is probably amplifying the
    noise like a drum. This is, of course, made worse if the surrounding
    environment is quiet. I would suggest that you learn to snore louder
    to drown the noise or, if you are feeling adventurous, take the back
    off the clock and pack some soft wool or cloth around the movement
    which will muffle the sound and stop the case from resonating. 

Best Wishes
Ian
Ian W. Wright
Sheffield  UK

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