I have been thinkng about building a 3 legged walking robot. Does anyone have any suggestions about where to start or go about it?
Here's one :
Three legs isn't very stable, so you'll have to design it to be stable on two legs. Are you thinking three legs in a row or in a triangle?
In a row would basically be a biped with a third hip connected alongside. For a triangle type you would need to be able to shift the center of gravity. One solution could be to have two legs functioning lika a biped, and the third as a stabilizer (or "tail") that only touches the ground during critical moments in the gai. I don't know. I'm just rambling here...
check this out: http://www.youtube.com/watch?v=Id79X6aNTEw&NR=1
It looks like the front two legs are doing most of the job and the back one is some sort of stabilizer, as maneuver said. As far as i can see the two front legs move one at a time and then they both stand still to let the back one move. Maybe you only need to shift to weight to the front when moving the back one, as one the other one moves there's no need to shift it (you haev the back leg which stabilizes the drone).
I am not sure it moves that way though
I always thought this was a wicked imaginative solution to the 3 leg mobility problem.
It falls and rotates its whole body around 2 legs. The sensor platform would be flipping upside down and right side up - but that could be a good thing (possibly) for scanners and such.