Category Archives: horology

Wire and Cardboard Escapement Mechanism

escapement

Moments after I took this video the escapement stopped. Then I made “improvements” which made it worse. Likely the whole thing needs to be scrapped but it only took me 30 minutes to make so no big deal. You can’t get too precious with cardboard.

Cardboard Gears Go

It worked in theory and it seems to work in practice too.

Work continues on the Super Simple Clock.

I had been pondering the best way insert bushings into cardboard for days when it came to me while I was putting on my daughter’s shoes — grommets! A little sanding with 220 grit on the 1/4″ dowel and it runs quite nicely. I’d didn’t have any 1/8″ dowel on hand but to my delight, I found that bamboo skewers are a remarkably consistent 0.005″ less than 1/8″.

The double thickness of Cheerios box may be a bit of challenge to cut for 10-year-olds, but with sharp scissors and some determination I really think they can do it. They’re too young for carpal tunnel syndrome right?

Super Simple Gear Geometry

This June I’ll be teaching a summer camp class to 4th and 5th graders titled “Gears and Gravity.” In my proposal I claimed, “We will explore the history and science of time keeping (horology) by hands on experimentation with simple machines and then construct our own real working mechanical clocks from paper and wood.” Now I have to design said clock.

My first challenge is to design a gear train (“going train” in horology parlance) with the simplest possible tooth profile that is easy to cut out and error tolerant.

Did I mention that my class budget is $125?

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