[sanddrag]

I don't understand how the drill can power the robot in one direction until a certain speed and then the Chiaphua will take over propelling the robot in the same direction at a higher rate of speed.

I guess I'm just stuck on the idea of "relative clockwise" This is a very neat idea and I'm terribly frustrated that I don't understand it. Would someone put arrows of rotation on the drawings to explain how it works at what stage in the movements or give me an extremely detailed description?

Thanks. I would really like to understand this concept as I can see that the mechanics are quite simple.