Hi everyone!
I have been thinkng about building a 3 legged walking robot. Does anyone have any suggestions about where to start or go about it?
Cheers,
Thomas
Three legs isn’t very
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…
thanks guys…both ideas are
thanks guys…both ideas are somewhat what i was considering. I was thinking of designing a star wars droidekas. That youtube video has given me some design ideas. But yes…it still we be a balancing act…
check this
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
the movement looks fine but
the movement looks fine but because this is just a computer animation I wonder if the physical movement is correct as in the “real world”. In other words, there isn’t a balancing problem because its only an animation…
That’s true. But after
That’s true. But after seeing your artoo i guess you’ll want to make it as close as possible to the one shown in films 
so i thought it could be of help
droideka
I would love to see a “real” droideka - good luck on that! I’ve thought a bit on the rolling action, and came up with a few ideas I want to try some time, but not the tripod walking thing. My thought was “one hard thing at a time”! Interesting YouTube video that robologist came up with. I hadn’t seen that one! WOW!
I’m sorry i forgot to
I’m sorry i forgot to include in my reply thank you very very much…the animation did give me afew idea’s none the less 
Yeah, I agree with you. I
Yeah, I agree with you. I may be following that concept but on a much larger scale requiring a few modifications to make sure it doesnt fall over after the first 2 steps…as I have mentioned earlier…if it was easy it wouldnt be any fun 
Alien attack
Hi,
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.
http://blogs.spectrum.ieee.org/automaton/2007/10/08/this_three_legged_robot_walks_l.html
Yeah, I thought this was a
Yeah, I thought this was a very cool concept and i wish i could find a way to implement it in my project but it just wouldnt work. Thank you for sharing the idea though
what about
a dwarf spider droid from starwars? 4 legs mounted turrent on top?
Yes, thats very cool but
Yes, thats very cool but still was hoping to build a droidekas. Thanks for the tip though
oh
oh i was looking forward to see one of these oh well ill try and make one, using cds as a base and some servo motors. i like your r2d2 by the way.
Good Luck if you build it
Good Luck if you build it and thanks!
u to
good luck with ur droidekas , and i think i will build it as i just saw a post with were to find cheap servos and stuff
As far as the 3 leg
As far as the 3 leg thing…It would be incredibly hard to get it to move in a stable matter. Even 4 legged robots have some trouble walking.
For stable movement, why not try 6 legs. (Like an ants!)
However, if you have your mind set on an innovative tripedal robot, try putting some weight in the middle leg, and let it do a “Sapian/caveman walk”
http://www.amazing-animations.com/animations/monkeys12.gif
Just pretend the gorillas actual legs is one big, flat leg.
Yeah, after a long look at
Yeah, after a long look at the possiblities a 3 legged walker is not looking too posible at the moment. I’m just going to have to continue building my 1:1 replica “wall-e” instead
Don’t Give Up!
Can’t go wrong with the classics, I suppose.
But don’t give up! Originality is usually worth the trouble if you achieve it. I’ll be looking foreward to your future robots.
As an extra hint, there are a billion robots out there with ~3~ wheels.