# Calculating a Clock’s Ideal Pendulum Period, the Sequel

In an earlier post I calculated the ideal pendulum period for the Korean clock by counting its wheels’ teeth (outer teeth) and pinions (inner teeth). This post is an update based on the errors I made while attempting to do the same for my second clock: the Ansonia kitchen clock.

What follows is a more detailed “how to” for calculating the pendulum period based on gear ratios.

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# Clock Repair 101: How the Great Wheel Works

I just now learned how the great wheels – the mainspring gears – work, by finding they didn’t work correctly in my Korean clock. The strike train Tension Washer, that is supposed to hold the gear firmly against the ratchet, has come loose. …so I had to disassemble the clock, after it had run fine for over 11 days.

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# The Second Clock: A Craft-Altered Ansonia Derby

Since I was making good progress on my first clock, I decided to haunt the antique malls looking for  a second one to repair. I wasn’t really planning to buy a clock until I’d finished the first, but I found the perfect second clock to work on.

I found it in an antique mall in Hillsboro (Oregon). It’s a mantel clock – a Kitchen Clock – similar to my family Seth Thomas clock that is my eventual target for repair (once I know what I’m doing).  It also fit the bill of a) not working well, and b) not worth a lot.

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# Clock Repair 101: Ordering Replacement Parts

In my previous post I calculated the theoretical length of the pendulum my Korean 30-day clock requires. You may recall that the clock as I bought it had a broken pendulum suspension spring, and the pendulum parts – the suspension rod and bob – were missing. In this post I order replacement pendulum parts.

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# Clock Repair 101: Making Sense of the Time Gears

In my previous post I finished cleaning my Goodwill clock, ending up with a jumble of gears and other parts. You may recall that when I disassembled this clock, parts sort of fell out willy-nilly, leaving me a bit fuzzy about what gears go where.  In this post, I figure out which gears are part of the Going (time) Train (gear set), and as a bonus I calculate the length of pendulum this clock requires.

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# Clock Repair 101: Disassembly / Destruction

In my previous post I covered the dangers of mainsprings, and bought the minimum of tools required to safely handle mainsprings. In this post I disassemble my junker clock.

Using my new mainspring clamps and Let Down key, I Let Down (unwound) the chime mainspring and time mainspring, following the process I’d seen in the videos:

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