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Originally Posted by spears312
Actually, we had a 4 wheel drive train with two wheels on each side, both pairs attached to a AM gear box, and we never had any problems with our turning.
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Just because you bought an AM gearbox doesn't mean you can turn well and just because someone uses a kit gearbox doesn't mean it can't turn well. I guarantee you I can build a robot with an AM gearbox that will not turn at all and I guarantee you that I can build a robot with a kit geabrox that turns like a dream. There is a lot more to it than just the gearbox and number of wheels (final gearing, battery charge, current consumption, voltage drop, wheelbase, track width, ground pressure, tread material, coefficient of friction, interaction between tread and carpet, tread and surface deformation under pressure, etc etc etc.) Such general comments should not be made and no one should rush right out and buy an AM gearbox (or any other gearbox) because they think it will make their robot fast, or because it will make their robot powerful, or it will make their robot turn better. That is simply not the case.
A photograph (top view preferable) would give us the pretty much the whole story on mechanically related problems. Once we get that, we might be able to rush right out and say "yep, that's why you can't turn." Also, if there is anyway you can get a video of the attempt at turning, that would be awesome. Picture is good but sound and picture is much better.