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Originally Posted by Sidtech
Isn't is possible to put the casters on springs to always keep the wheels even?
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A robot like this is necessarily an inverted pendulum. You can't stabilize it and keep the CG directly above the wheels without a Segway like control system. You could, however, purposefully shift the CG to one side of the wheels and keep it low. This would keep your robot leaning to one side the majority of the time, except when you're accelerating or something.