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How To Regulate The Time Of Your Grandfather Clock

If your grandfather clock is running slow or fast, it is easy to adjust and regulate  it.

Grandfather Clock Pendulum

Grandfather Clock Pendulum

Changing the speed of time keeping is accomplished by moving the pendulum disk up or down. The pendulum disk is moved up or down by turning the adjustment nut.
To slow the Grandfather Clock down, move the pendulum disk down by turning the adjustment nut to the left.
To speed the Grandfather Clock up, move the pendulum disk up by turning the adjustment nut to the right.

Day One
1. Select a time of day that will allow you to check your Grandfather Clock at the same time for at least six days.
2. Record time selected.
3. Check correct time.
4. Re-set the minute hand to the exact, correct time.

Day Two, Three, Four, Five, Six (If Necessary)
1. Check correct time.
2. Compare time shown on your Grandfather Clock with correct time. Is your Grandfather Clock fast or slow?
3. Turn the adjustment nut on the pendulum one complete
revolution for each half minute fast or slow per day. (24 hours).
4. Check correct time.
5. Re-set the minute hand to exact, correct time.

How it Works:
When you turn the nut down, you are lengthening the Grandfather Clock pendulum making the clock run slower. When you turn the nut up, you are shortening the Grandfather Clock pendulum making the swing faster which will increase the speed of your clock.

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4 Comments

  1. Linda
    Posted November 4, 2013 at 4:08 pm | Permalink

    I’m having problems regulating the number of chimes my clock strikes with the time on clock, it’s one strike behind.
    Any suggestions?
    Thank You,
    Linda Spears

  2. The Clock Depot
    Posted November 13, 2013 at 6:15 am | Permalink

    Hi Linda,

    Easy fix!
    1) When the clock comes up to the next hour, count the hour strike from the chimes.
    2) Move the hour hand (the short hand) to the number of the hour you had just counted.
    3) Move the minute hand to whatever the correct time is where you are at that time.
    Done! Sometimes it does take about an hour for the chimes to sync correctly, but this is how it is done.

    Good Luck,
    Robert
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  3. Ed
    Posted February 10, 2014 at 8:52 am | Permalink

    Hi, Our grandfather clock is running about 8 minutes slow in a 24 hour period. I was able to get one full turn to try and adjust the speed but thats all the threads there were. It hasn’t been running for years and I’m trying to bring it back to life. Any easy solutions?
    Thank you

  4. The Clock Depot
    Posted February 28, 2014 at 6:47 am | Permalink

    Hi,
    It is probably the pendulum length, though it could be a problem in the movement. Take out the pendulum and place it back up on a flat surface. Examine the nut and the threaded rod to make sure it is all the way up. If you are truly at the end of the threads, make sure the bob (the round disk) is able to move up and down with the nut. If it is, you could place some type of a spacer (like another larger nut of any kind) slightly larger that can move freely up and down the rod, then place the original nut under that one which will raise the bob to a higher level. If this is original pendulum and the nut was at the top of the threads, I would really suggest finding a clock tech in your area, as it is probably something else.

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