A few years ago, I made the workings of a clock with 3 coaxial hands. After a long time, I decided to try to get it to actually run on time. I attached an escapement gear and an ajustable pendulum to regulate the time. It has a 1 second period to make it easy. Then, to turn the clock, I put a heavy weight on a chain, followed by a lot of gearing down to last a while. It worked, but I found that to have a clock that lasted longer than 5 minutes, I would have to use a weight so heavy it started to warp my parts. So, after figuring out the pendulum worked great, I decided to opt for a motor and give my clock a body.

Step 1: Building the Innards

When I moved away from the prototype, I kept most of the original parts but I had to move stuff around to get it to all fit with the escapement gear in the center. I also added a sliding axle that could disengage the second hand to adjust the time.

For the motor, I put a slipping gear so the motor wouldn't stall between every tick. It runs off of 2 AA batteries in a battery pack I soldered to an old broken lego wire.

Step 2: Up and Up

At first, I thought 4 pillars would be enough, but It turns out the pendulum can be messed up by reletively small air currents...

Step 3: Final Look

Building from top to bottom, It took a few days to get this thing so tall. I feel like I spent so long looking for all of my red bricks. Then when the red bricks seemed to run out I moved onto black. Finally, when I gave up on black bricks, I just let the bottom of the pendulum show.

There you go, my Lego grandfather clock.