# Do-It-Yourself Chaos Machine (double pendulum) - do it yourself

Ok people, this is my first Instructable so be nice...

I wanted to create a sculpture that combined both my passion for science as well as for art. In particular, I wanted to create movement.

The chaos machine is a simple example of chaotic behaviour. Starting the pendulum from a slightly different initial condition will result in a completely different trajectory. If you are not very familiar with Chaos theory here is a little: it is awesome. A little more: http://en.wikipedia.org/wiki/Chaos_theory

Sbtroy has a great Instructable on a how to build your own double pendulum, I would recommend checking it out as well, I wish I had before building my own. http://www.instructables.com/id/The-Chaos-Machine-Double-Pendulum/

Spinning the pendulums will create some crazy unexpected movements, but really I don't think you can truly appreciate the beauty of it unless you can see it frozen over time. The picture above shows a long exposure and I think you can tell where I am heading... What I really wanted to create was a way to see this live! without needing an external device (camera, computer etc..). A glow in the dark film and a high power UV LED do the job beautifully, skip to the last step to see the video.

## Step 1: The concept

Lately I haven't done anything without sketching what it will look like on the computer, I guess this helps me see what the final product will look like and give me a clear goal to work towards to.

I made the models on Inventor and later did some fancy renderings using Keyshot 4.

## Step 2: Machining time!

Careful as always, don't forget your eye protection.

At first I started making my own custom screws but after trying and breaking them too many times I decided to visit my local hardware store...

For the actual arms I drilled the holes first, clamping the four arms together, then performed the cuts one by one.

## Step 3: Polishing and assembling

After what seem to me as a really long time of carefully polishing the aluminium I was able to put everything together and give it a quick spin.

## Step 4: Test no. Uno + Glow in the dark!

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After waiting a couple of weeks for my Ebay order to arrive, I finally got the glow in the dark film. For the record, I first tried glow to paint the board with glow in the dark paint but didn't quite worked.

Some hot glue, batteries, a high power UV LED and a switch...

Turn the lights off and admire the beautiful consequences!

ps. It was really hard to capture it on video since cameras don't work well on dark situations, in other words, it looks a lot better live!