There are two main types of Plum Coupling, one is the traditional straight claw type, and the other is a curved (concave) claw type zero gap coupling. The traditional straight-claw Plum Coupling is not suitable for use in high precision servo drive applications. The zero-gap-type Plum Coupling evolved from the straight-claw type, but the difference is that it is designed for servo system applications and is often used to connect servo motors, stepper motors, and ball screws. The surface is designed to reduce the deformation of the elastic plum spacer and to limit the effect of centripetal force on it during high speed operation. The zero clearance jaw coupling is a combination of two metal bushings and a plum elastic spacer.
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