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Bob Houston posted an update 8 years, 9 months ago
I resigned the Top Stomach so now it can lean Forward and Backwards. The design is a ball joint with 3 servos. It still needs some work but the concept is good.
Mmmh I had written a comment a few hours ago, but I guess it just disappeared. Awesome work Bob!!!!!! This is really adding a cool feature!! When I was designing the stomach parts I wanted set in a 3d printed “rotule de cardan” (I don’t know how it’s called in English http://motopieces.fr/wp-content/uploads/2014/03/rotule-de-cardan-624×468.jpg) to have a similar movement. But I was worried about the strength of the pistons. It seems to hold well back and forth! How do you measure the servos angles positions with your system? Or did you keep the potentiometers within the servo? Anyway this is thrilling to see!!!
Thanks for your comments, Gael. Over here we call that type of joint a U-Joint. I considered that type of joint for this modification but the ball joint is much simpler. I left the pots in the servos and used my modified pistons that I made earlier for the Top Stomach. The reason I am experimenting with this is, that for walking I think the robot needs this DOF.
very good idea use this articulation bob i think to use the same idea for ankle was the best
Thanks Bob for the name “U-joint”, I couldn’t grab it on internet. You are totally correct concerning good stomach movements for to be able to have human gait ressemblance.
The parts for this modification are on Thingiverse. http://www.thingiverse.com/thing:1409964