What is the purpose of a coupling in machinery?

The purpose of a coupling in machinery is fundamentally to connect two shafts together to transmit power from one shaft to another. This connection is crucial because it allows for the transfer of rotational motion and torque, enabling different components of a machine to work in unison. Couplings can accommodate a certain amount of misalignment between the two shafts while maintaining the efficiency of power transmission. They are used in various applications, from simple machines to complex systems, ensuring that energy flows smoothly between interconnected parts.

By effectively joining shafts, couplings help maintain the operational integrity of the machinery, allowing components to rotate together without significant energy loss. Therefore, the connection they provide is vital for the overall functionality and performance of the machinery. Other options may relate to aspects of machinery operation but do not define the primary role of a coupling, which is about connecting shafts for efficient power transfer.