Download video: Self Balancing Gyroscope on Two Inline Wheels
Channel: Jimmy Demello
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Warning: cd rotors are very dangerous, mine was cracked and exploded. If you must build one, wear safety glasses or you may end up blind.
Built this simple self-balancing two wheeler model using a dc motor, 4 cds as a gyroscope rotor and an acrylic ruler and wood frame. You will have to watch the video to find out the secret to balancing with a gyro.
I also tried attaching two parallel wheels (also did inline wheels) but it just wants to spin in a circle and when I try to move it in the direction of the wheels it falls over easily unless I push very slowly. I suppose motorized wheels will work but without some active dynamic balancing mechanism it would be pretty susceptible to falling.
Update 5/19/2006: discovered that with free precession the mass of the rotor does not have to be as high as when doing forced precession where it must be much higher to maintain it's balance.
More details at http://letsmakerobots.com/content/gyro-stabilized-two-wheeler-v5-steering