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Originally Posted by Veselin Kolev
And a random thought, wouldnt it be awesome if you had 4 wheel drive using one power source and 2 differentials and shafts, each wheel having disc breaks, so that if a wheel loses traction, you lock the disc breaks, rerouting the power to the other wheels? It would be very impressive to actually have that many working feedback encoders on your robot... just a random thought.
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They have that on lots of full size cars and from what I read it workspretty well. On a robot, I don't think it would be practical to have all your power coming from one gearbox because then yu could not have one side going forward and the other going backward for turning in place unless you had a reverse gear, which would be overly complex.
Also, since in most robots the wheels are linked with chain, the wheel will always be driven regardless of whether it is in the air or on the ground.
But to answer your question, yes, it would be cool.
As for brakes, I seem to recall one team using a pneumatically actuated disk brake to hold their arm in position.