The Clock Of The Long Weekend…

by Stephen Hobley on July 25, 2011

I’ve spent a lot of time on the “The Long Now” website lately – I would urge you to check it out if you’ve not seen it – one of the things that caught my attention was the 10,000 year clock they are trying to build in Texas.

Inspired by the design, I thought I would have a go at redesigning my EM clock to use a governed rotary regulator.

The design is similar to a Torsion Pendulum, but it does not oscillate. It turns continually, driven by an impulse drive and feedback/monitoring electronics. It’s not as consistent as a pendulum, but it does have advantages in terms of size and stability (since the EM pendulum is driving the clock – it tends to swing more violently than a regular escapement driven one).

It was also an excuse to learn how to design Geneva wheels

Here’s a time-lapse of the Geneva mechanism…


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