(3) Oldham's coupling
The two rotating shafts are aligned but not centered. Three disks link the two shafts. The center disk has two perpendicular convex projections, one on each side. The disks mounted on the axis can slide into these projections, compensating for the eccentricity. This coupling passes the rotation in a uniform manner to the outgoing axis. [Animation: DI JING, M2, Graduate school of informatics, Mar. 2001]
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