How to Build an Extender

If you've seen a video or picture of the NXT scorpion robot (called 'Spike'), you've seen that the tail uses an interesting method for extending.

Constructopedia.media.mit.edu has a great little tutorial on how this is done using the Technic pieces (and some gears). Very little is known about the inclusion of gears with the NXT system, but the tutorial still shows you how the majority of the movement is accomplished.

(Click here to see the scorpion tail movement.)