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Originally Posted by QuantumNinja
Alright. Our robot is configured to have all 4 wheels being driven, two motors on each side drive each sides wheels. To steer, it obviously slows down one side, or to spin on a dime, one side goes forward, the other backwards. The problem is... the robot seems to "hop", and the motors get really loaded when turning and especially when trying to spin. We are using the IFI Robot Wheels which are extremely grippy. I notice that alot of teams steer like this... and i'd like to know how they overcome the probelm we are having. Thanks.
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Quantum,
As you see, this is a common problem with tank style drives. The side friction causes incredible (near stall) current demands on the elctrical system and the hopping is due to a variety of factors including robot frame flexing. The best alternative at this stage (late in the build season) is to use omni wheels. A variety of types are available including the types found here.
http://www.andymark.biz/plastic-omni.htm which are easily available and designed for First robot use. Once installed you will find your robot is happier, your electrical system is happier and drivers are happier.