[time-nuts] Re: Grandfather clock sync'd to 1PPS

[Andy Talbot]

>
> G3PLX did something similar, synchronising his GF clock to GPS.   But
> wanting to make no modifications to the pendulum, IIRC he placed a
> solenoid near the pendulum and used eddy current loss to slow it down.
>
> Andy
> www.g4jnt.com
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>
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> On Thu, 11 Mar 2021 at 11:16, Peter Torry via time-nuts <
> time-nuts at lists.febo.com> wrote:
>
>> Hello Paul,
>>
>> You will still need to power the clock by winding it up when required.
>> The pendulum does not drive the clock, it regulates how the power is
>> allowed to escape from the driving force through a mechanism called the
>> escapement.
>>
>> As far as regulation goes the traditional was is to fis a soft Iron pole
>> piece to the pendulum about  a quarter of the way down from the
>> suspension and mount a coil of wire adjacent to this such that the pole
>> piece enters the coil on the excursion of the pendulum. The control
>> mechanism inserts a current through the coil in 100 micro amp steps to
>> bring the clock to time. The best way to monitor the timekeeping is by
>> using an optical detector and feeding the result back into the coil.
>>
>> There will still be variations from second to second because of
>> escapement error so it would be best to start with a clock using a dead
>> beat escapement or better.
>>
>> Enjoy the experiment.
>>
>> Regards
>>
>> Peter
>>
>>
>> On 11/03/2021 02:28, paul swed wrote:
>> > Like you all, I have always thought it would be fun to mess with a
>> > pendulum clock. Since I have one already what stands in the way? Well my
>> > Wife might think very differently about a few screws and wires in that
>> > clock. At the other end of the spectrum is Bill S. beautiful clocks he
>> has
>> > built. Not going to be anything like that. So will have to settle for a
>> > magical deal some day. Though for now Fleas and other gatherings are
>> out.
>> > I was wondering about winding the clock. And I see its still needed. I
>> had
>> > thought by driving the pendulum the clock would not need the drive
>> weight.
>> > Am I wrong about that? Or simply they are two different and separate
>> issues.
>> > Want to thank Gerald for sharing what he did and starting a great
>> thread.
>> >
>> > Regards
>> > Paul
>> > WB8TSL
>>
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