Cutting a pendulum to the right length
The pendulum suspension rod for my antique Ansonia kitchen clock lacked the pin in the top, so I bought a replacement. The replacement suspension rod comes way too long, so I needed to cut it to length.
This video shows the Before and After of my process of cutting the pendulum to the right length. With the movement running on a test stand.
First, I calculated the designed pendulum period and theoretical length, based on the gear teeth counts in the clock's time train. See https://bluepapertech.com/clock-repai... for the details of that process.
Because the theoretical and real pendulum lengths aren't the same, I like to work with differences of pendulum length instead of an absolute length. So I first cut the pendulum suspension rod to a deliberately over long length, then measure the period of that pendulum, calculate the difference between that theoretical length and the designed ideal pendulum's theoretical length, then I take the difference and cut that much off the pendulum.
I explain that whole process in detail in https://bluepapertech.com/clock-repai...
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