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2

If you don't need constant speed motion a better idea would be to use a crank running from any modern motor (ie, geared down internally). That way you can guarantee the end points. For a 240° rotation you might need to gear up after the crank, but as long as there's a spring or constant load in one direction backlash shouldn't be an issue. Here;s a really ...


3

It would be difficult to get the exact rotations that you are talking about using Power Functions parts. The servo motor would be your best option, but its range is fixed to +/- 90 degrees from center. If you use a controller with variable speed, it will rotate through 7 steps to get to 90 degrees in either direction. If you're willing to look at ...


3

I think I'd use the ultrasound sensor instead of the touch sensor (or the brightness sensor with the light turned on in a dark tunnel). I haven't tried this but I'd worry about the touch sensor derailing or scratching the train. Otherwse, your system sounds pretty doable. The collision risk could be addressed by setting up the sensor a little further before ...


0

You could try connecting your wheels using the friction pin/axle This provides some friction to the wheel hub while also giving the motor an axle to turn. It won't work if there is too much resistance, but for small setups it might be okay and it will fit in all the existing pin-connected wheels. If you're feeling crazy, you could always glue the axle ...



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