Red Seal Machinist Practice Exam

What is the purpose of tapping in machining?

1. To enlarge existing holes

2. To create internal threads in drilled holes

3. To increase the depth of a hole

4. To smooth the edges of holes

The correct answer is: To create internal threads in drilled holes

Tapping in machining is primarily used to create internal threads in drilled holes. This process involves using a tap, which is a tool with a specific thread profile, to cut threads inside a pre-drilled hole, allowing for the insertion of screws or bolts that will fit securely into that internal threading. This is critical for establishing strong mechanical connections and ensuring that fasteners can be reliably installed. Creating internal threads allows for efficient assembly and disassembly of components, providing versatility in the manufacturing process. The precision of the tapping process ensures that the threads are uniform and properly aligned, which is essential for the performance of the final product.