Quote:
Originally Posted by Ari423
Since only the front wheels can impart a sideways force on the robot, the robot will turn (w/ CoR between the back wheels). If all 4 wheels were balls, it would be a true-omnidirectional drive. As it is now, the robot drives more like a car, where the front of the robot can go sideways, while the back of the robot doesn't.
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3 Wheels, you don't need 4.
Alan - I believe this system would have a difficult time translating and rotating at the same time, but, as I haven't built one or played with one I can't confirm this without putting in a bit more thought. But I think that's what folks are getting at. But I think that's based on my mental model of the wheels being the same as an omni wheel and I'm thinking that's not right.