Red Seal Machinist Practice Exam

What type of cutting operation is often required for creating a threaded hole?

1. Drilling

2. Tapping

3. Milling

4. Turning

The correct answer is: Tapping

Tapping is the cutting operation specifically designed for creating internal threads in a hole. During this process, a tool known as a tap is used to cut the threads into the material. The tap is inserted into an existing hole and rotated, which carves the threads into the wall of the hole, allowing for a screw or bolt to be inserted securely. While drilling is essential for creating the initial hole, it does not create threads. Milling can also be used for cutting threads, but it is not the primary operation for threading small holes and typically isn't used for internal application like tapping. Turning involves rotating the workpiece against a cutting tool to shape it and is not generally used for creating threaded holes. Thus, tapping is the most appropriate and accurate choice for this operation.