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...
Watch video Cutting a pendulum to the right length online without registration, duration hours minute second in high quality. This video was added by user Bradford Needham 10 March 2019, don't forget to share it with your friends and acquaintances, it has been viewed on our site 3,52 once and liked it 5 people.