Category Archives: Projects

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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Loosening Antique Glue Using Heat

As I said in my previous post about the Ansonia Derby clock, it seems that long ago part of the upper gingerbread broke and the owner sawed off the rest, reducing the upper gingerbread to a simple arch. I’d like to create new gingerbread for this clock. To do that I need to unglue the original, cut remnant and glue my to-be-designed gingerbread in its place.

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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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