How does an interference fit work between a shaft and a coupling?

An interference fit works by creating a tight fit between two components, in this case, a shaft and a coupling, where the dimensions of the shaft are slightly larger than the inside diameter of the coupling. This method relies on precise manufacturing to ensure that when the shaft is inserted into the coupling, it requires force to push it in. The resulting pressure creates a strong connection due to the friction and mechanical lock between the two parts, preventing them from separating under load.

This fit is designed to withstand considerable torque and can be essential in applications where precise alignment and strong coupling are necessary, such as in machinery or mechanical systems. The solid grip established through this forceful insertion is what gives the interference fit its reliability and strength in action, making it suitable for applications that need a solid, movement-free connection between rotating parts.