I built this model to demonstrate the workings of a differential. It is possible to transmit drive from one crank handle to the other but also possible to turn both crank handles at the same time at different speeds. This is the same mechanism that allows the drive wheels of a car to rotate at different speeds when going around bends. Unfortunately I can't see how to make this more compact so that it could be part of a practical drive chain.
Built : September 2011