The three most commonly used cam and follower systems include radial and offset translating rollers and ______ roller follower:

In cam and follower systems, roller followers are essential components that interact with the cam profile to transmit motion effectively. The correct answer identifies the swinging roller follower, which is one of the three commonly used configurations alongside radial and offset translating roller systems.

Swinging roller followers are characterized by their ability to pivot about a fixed point while following the cam profile. This design helps to accommodate the movement of the cam while minimizing wear, as the roller maintains constant contact with the cam during operation. The swinging motion allows for smooth transfer of motion and can handle varying cam profiles effectively, making it suitable for different applications.

The unique advantage of a swinging roller follower is its simplicity and low friction. Because the roller pivots, it can adapt to varying angles of cam movement, which can lead to smoother operation in machines and mechanisms that utilize these systems. This makes the swinging roller follower particularly effective in applications requiring precise timing and motion, such as in engines or other mechanical systems.

The other options, while they might denote specific types of followers, do not represent one of the three most commonly utilized configurations in cam and follower systems, underscoring the significance of the swinging roller follower in machine design.