# Why is my grandfather clock running slow?

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## What causes a grandfather clock to run slow?

If you turn the nut as to lower the “bob”, the clock will run slower. The pendulum disk is moved up or down by turning the adjustment nut. … The Grandfather clock pendulum adjustment is done by turning the nut at the bottom up to speed up the grandfather clock or down to slow the grandfather clock.

## How do you fix a slow running clock?

To slow down the clock, loosen the adjustment nut (turn it toward your left). The bob will settle lower, making the effective length of the pendulum longer. The clock will run slower. To speed up the clock, tighten the nut (turn it toward your right).

## How do you speed up a pendulum clock?

The clock can be made to go faster or slower by means of the nut at the bottom of the pendulum. Turning the front of the nut to the right speeds up the clock, and turning it to the left slows it down (in other words move the nut up to speed up, or down to slow down). Turn the nut only a small amount each time.

## What causes a pendulum to slow down and stop swinging?

When the swing is raised and released, it will move freely back and forth due to the force of gravity on it. The swing continues moving back and forth without any extra outside help until friction (between the air and the swing and between the chains and the attachment points) slows it down and eventually stops it.

## How do you fix a grandfather clock fast?

If the clock is running fast, move the bob down or turn the nut to the left. If the clock is running slow, move the bob up or turn the nut to the right. Restart the pendulum and reset the clock hands to the proper time. It is easy to remember: lower is slower and left is lower.

## Why Do Clocks Run Slow?

Since the light signal must travel so much farther to traverse the rod of a moving clock, it takes much longer to do it. Hence a moving light clock ticks slower. In this case, for a clock moving at 99.5% the speed of light, it ticks once each twenty seconds instead of once each two seconds.

## Why does my clock keep losing time?

If you have a battery-operated clock, there is a good chance that your batteries may have aged which can greatly affect the operation of your clock. If your clock is electric, another culprit may be that your clock has dust build-up. … Lastly it could simply be a slight jam in the clock hands.

## Why does my clock always run slow?

Moving a clock from sea level to a higher elevation will affect the speed of the clock. Pendulum too low or too high: The lower the pendulum the slower the clock will run. Many pendulum clocks can be adjusted either by a set screw at the bottom of the pendulum or by an inset screw on the pendulum.

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## What does RA mean on a clock pendulum?

The R A on the pendulum stands for: retard/advance. It is a common pendulum bob, used by many manufacturers, worldwide. As a rule of thumb, the thread on rating nut is designed so that one full turn changes the clock about 2 minutes per week.