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For those that remember us , team 521 L33T CREW, from UTC ( we were the team that would have seizure like movements on the field and had to use the joystick diagonally to go in the somewhat right way) are whole problem was with the gear boxs and trying to get the ratios between the two motors the same!!! Never year we are definatly going to get rid of the prefab and build are own custom ones like we have before
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Our team had problems steering too. While I can't think of a reason that it was the gearbox but here are all the theories I could think of:
a)the drill motors are timed the same-What this means is that the drills will turn faster in one direction and slower the other way. This means if you have one motor wired differntly from the other your robot will have a tendancy to go off in one direction.
b)Spacing of wheels- Our wheels were really close together which is not a good thing. Thie closer the wheels the harder to steer.
c)Programming- Meh we had no time to fix it in programming.