Oldham coupler

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Oldham couplers are a type of mechanical device used to transmit rotational motion between two shafts that are not in perfect alignment. They consist of an idle gear and a drive gear, connected by a fork-shaped arm called the "coupling dog." The coupling dog moves along the length of the idle gear as it rotates, ensuring continuous engagement between the two gears. This allows for smooth transmission of power even when the shafts are not perfectly aligned.