Quote:
Originally Posted by joeweber
Instead of going to complete crab drive how about just steering left 90 degrees and right 90 degrees.
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For an example of something like this, see the pictures in the CD-Media photo gallery of team 842s robot Carmen. The front wheels steer and have motors and transmissions that steer with the wheels, the rear wheels are driven by another pair of motors and transmissions and do not steer (but will have software differential speed control to help the robot steer).
http://www.chiefdelphi.com/media/photos/32275 for example...this was built in a few days in a small, not very well equipped shop, by a bunch of clever, dedicated people with no mechanical engineering mentors.