How To Clean And Oil A Howard Miller Grandfather Clock

How To Regulate The Time Of Your Grandfather Clock

Posted on October 8, 2010 | By clockde | 51 responses

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

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.

*** IMPORTANT: You do need to set your clock with another that indicates seconds or if you are using a smartphone or VCR, set your clock when the time advances one minute to the next. Failure to do so may give you poor results as you will not know what portion of a minute has passed to when setting your clock.

Day Two, Three, Four, Five, Six (If Necessary)
1. Check correct time.
2. Compare time shown on your Grandfather Clock with the 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. Never turn the nut more than one revolution per day or you may overcompensate. Each time you make an adjustment, you should turn it less than the previous day.

01-28-2015

If you have lowered the nut as far down as it appears and your clock is still fast, you should check to make sure the nut is properly fitting the slot on the bottom.

We have added advanced instructions on setting up your pendulum on the following page:

Adjusting and Setting up your Pendulum on your grandfather clock.

Posted in Clock Help and Instructions