In fact, I wanted to build a robotic tripod for my camera. I found out, that it's more difficult then it looks. After some experimenting I build this simple robotic arm.
I you want to build it too, you need:
- Lego Mindstorms NXT kit
- a computer
There are only two rules you have to follow while building ANY robot:
1. rule: KISS (Keep it simple, stupid!);
2. rule: "The triple-F" rule a.k.a. FFF (Form following function!)
Step 1: Constructing the base
The base (in our case) are just a few beams that support the robot. More advanced robotic arms have motors in the base. These motors than move the arm, without moving themselves. Usually, the base has a motor that rotates the arm, but my arm rotates itself.
You can be much more creative with the construction of the robot then I was.
Step 2: Building the "rotation module"
It's very simple. It rotates the arm left and right and supports the other two modules. It's based on Matthias Paul Scholz's 90 degree join at: