To speed up a clock you must make the effective length of the pendulum shorter.
Pendulum wall clock running slow.
If the clock is running slow turn the pendulum nut clockwise to increase the rate.
It is always easier for the clock to begin slow and then start raising the pendulum nut so the clock will gradually run faster until the correct time is achieved.
Simply start the pendulum swinging and move the case gently until the tic and toc are in good balance.
Adjusting the pendulum shorter will cause your clock to run faster while lengthening it causes it to run slower or simply put speedup slowdown in the pendulum regulation diagram below look for the rating nut at the base of the pendulum which is what raised or lowers the pendulum disk or bob.
If the pendulum is too heavy it causes the centre of gravity to be too low consequently the clock will run slower.
If your clock has an all metal pendulum and is in a area where the temperature is relatively stable you should be able to get it close.
The length of the pendulum determines how fast it swings so you need to either lengthen or shorten it.
Don t worry about getting a level out and finding a perfect plane.
Check your clock against accurate timepiece or computer now you need to check your pendulum clock after 24 hours against an accurate timepiece or computer.
I had one where it stayed accurate within seconds a month.
Parts of the clock related to the pendulum pendulum is the incorrect weight.
Adjustment on the dial if your clock has a small arbor protruding the dial near the 12 or the 6 or perhaps in the center of the dial then use this method.
A clock that leans to the left or right at the slightest angle will throw your pendulum into pandemonium or stop it in its daily tracks for tracking good time.
Anything that increases the length of the pendulum will reduce the rate of the pendulum and result in a clock that is running too slow.
Wall clocks may run too fast or too slow without proper care.
This is probably just because your pendulum is moving too fast or too slow.
In case your clock is running two or three minutes slow or fast then you do not need to go to the next step.
It runs too fast.
4 repeat the above using less turn on the nut until the pendulum is the correct length.
Lengthen the pendulum by moving the bob down it runs too slow shorten t.
It takes some patience.
Push the bob up to make the clock run faster and push the bob down to make it slower.
Adjust the bob at the bottom of the pendulum if the clock is running too fast or slow.
Most pendulum grandfather clocks are capable of keeping great time if the pendulum bob is moving easily up and down the rod.
To slow down the clock the pendulum length must be longer.
No need to take it to the clock repair shop.
Shorter pendulums swing faster than longer ones do.
If your grandfather clock is slow or fast the speed is dictated by this adjustment.
