Millwright Level 1 Practice Exam

What effect does a boring operation have on a workpiece?

1. Reduces the diameter of a workpiece

2. Increases the diameter of a hole

3. Creates external threads

4. Machinings the surface flat

The correct answer is: Increases the diameter of a hole

Boring is a machining process that specifically focuses on enlarging existing holes within a workpiece. It typically involves the use of a single-point cutting tool, which enters the pre-drilled hole and removes material to achieve a larger diameter. The operation is highly accurate and is often used to improve the tolerances and finishes of holes. As a result, the primary effect of a boring operation is to increase the diameter of a hole, making this choice the most appropriate answer. In terms of the other options, reducing the diameter of a workpiece would not apply to boring, as the operation explicitly works to enlarge holes rather than decrease diameters. Creating external threads is a different process altogether, involving the use of taps or dies, and does not occur during boring. Lastly, machining the surface flat refers to surface grinding or milling processes rather than boring, which is specifically about working with holes. Therefore, recognizing that boring's singular purpose is to increase existing hole diameters is essential for understanding its role in machining operations.