I was thinking about using this video game mascot for a robot. Only problem I’m thinking about right now is the one wheel and the arms. Would anyone know how i would be able to make arms like that? And if not what about longer ones than the ones on the site?
img39.yfrog.com/img39/9416/adpb.jpg
the first think i would think about doing is changing the “Wheel” for a ball or two wheels. with one wheel im not sure how you will turn.
or continuous rotation servos.
Yeah I thought of that too, but i never thought of changing it to that type of configuration. Where would you buy the parts to build something like that?
might be best to start off at google:
try looking for Omni-directional Roller Wheels or self balancing robots
Now what about the problem of the arms? I want it to be a little longer and weight capacity higher than the ones here on the site. Would I be able to use the same design just larger scale parts and servos?
Is that “game mascot” a real working 'bot, or just an artist’s conception? Artists have a little more freedom of “design” then engineers. Take the “War of the Worlds” 3-legged 'bots.
The SES parts have tube parts and connectors, just remember that the long arms imply considerable “leverage”; and that leverage translates to expensive (if even available) R/C servos.
Draw your arms, work up the weights, calculate the lever arms to determine the torque needed by your servos. Then see if you can afford or even buy them!
Alan KM6VV
Jonny,
I like the ball-balancing-robot3 pix you posted! That would make an interesting project!
walyou.com/blog/2010/05/03/ball-balancing-robot/
Alan KM6VV
(back from vacation)
yes. one of the best iv seen.
LM also do a self balancing assembly. im sure it can be improved on. 
Just an artist’s rendering but hes such a character that I wanted to take a smack at building him.
here are some videos of him in game.
youtube.com/watch?v=KaH9aRr7wcA
By the way any idea what the type those stepper motors are. aparantly that ball is just a rubber coated 8lb bowling ball
The steppers are probably bi-polar; perhaps 150-280 oz/in. 2.3v to maybe 5v windings. Optimally driven with a good chopper motor driver. I’d say they are similar to the ones used in our small CNC mills. (Lots of guesses here, but I’m sure they’d work). Mine are 150 oz/in.
Alan KM6VV