Millwright Level 1 Practice Exam

Where is a revolving centre installed?

1. In the headstock

2. On the carriage

3. In the tailstock

4. On the bed

The correct answer is: In the tailstock

A revolving center is typically installed in the tailstock of a lathe. This component is essential for providing support to the workpiece during machining operations, particularly when turning long or slender items that could flex or vibrate during the cutting process. When positioned in the tailstock, the revolving center helps ensure that the workpiece is held securely while allowing it to rotate freely. This is especially important for maintaining accuracy and stability during operations like turning, as it minimizes potential errors caused by vibration or lateral movement. The other locations mentioned, such as the headstock, carriage, and bed, serve different purposes in the operation of a lathe. The headstock houses the main drive mechanisms and the spindle where the workpiece is held, the carriage holds the cutting tool and allows it to move, and the bed provides the foundational support for the lathe but does not typically accommodate a revolving center. The proper use of the revolving center in the tailstock is vital for achieving a precise and efficient machining process.