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NXT third wheel

A simple two-motor NXT car needs a non-powered wheel (or wheels) of some type. A single wheel is often a good choice, since it is simple to build and makes turning the car easier than a pair of non-powered wheels. In fact, the “wheel” does not need to be a wheel at all; a slider can be a good substitute. Four possible third wheels/sliders are shown below: a fixed wheel, a tow-ball slider, a knob-wheel slider, and a castor wheel.

NXT front wheels

 

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bbratzel

bbratzel

Barbara teaches at the Shady Hill School in Cambridge, Massachusetts and works at the Center for Engineering and Education Outreach at Tufts University. She is the author of several LEGO robotics activity books for teachers, most recently STEM by Design.
bbratzel

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