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This can be done without a caster wheel as well: Start out with a three wheeled vehicle, with two wheels in the front and one smaller wheel with less traction than the front wheels in the back. All wheels need to be fixed. One of the front wheels is attached to the motor. This might need to have some gearing to get an appropriate speed. The other front ...


One motor and a caster wheel will give you two degrees of movement but will not be steerable. If you can build a differential, then drive two wheels with the motor. If you have limited gears, then drive one wheel, have an idler wheel and a caster or simple skid arrangement. You can get more interesting behaviour by having a bumpbot, that simply reverses ...


Too much backlash (play) in LEGO gears is an universal problem that unfortunately can't really be mitigated since all compatible LEGO gears are designed with very loose tolerances compared to professional gears. According to Sariel the bevel gears you tried using already have less backlash than regular gears, so you can't really expect any improvement by ...


Here is a possible implementation using this exact part: Video . There are also several other solutions with different pieces if you need more inspiration or explanation: Animated GIF, 4 wheel steering, Top-down view.

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