An interesting kinematic device that can be spun in either direction when the parts are aligned symmetrically. However, when the parts are not aligned it only wants to spin in one direction or the other and will actually reverse if spun the wrong way. Dr. Dave's Rattleback can be made to spin clockwise, counter clockwise or both directions depending on the orientation of the top piece. See: www.WoodKinematics.etsy.com
How to make it
MyHowtoman 3 months ago
What kind of sorcery is this!!!!!!!!
zate1982 3 months ago