What is the primary role of tapping in machining?

Tapping is a machining process primarily used to create internal threads in a workpiece. This is achieved by using a specialized tool known as a tap, which has cutting edges designed to cut threads as it is rotated into the material. The tap's helical cutting edges engage the material and effectively form the internal threads, enabling the production of threaded holes that can accept screws, bolts, or other threaded fasteners.

This process is essential in many applications where fastening components securely together is necessary. It allows for the creation of precise and repeatable internal threads that can hold screws or other threaded components, ensuring reliable assembly and structural integrity.

The other choices describe different machining processes. Creating external threads is not the role of tapping; that process falls under threading or similar operations. Forming holes for screws without threads would typically involve drilling or a similar action, and drilling precise holes at various angles also refers to a different machining technique entirely. Therefore, the focus of tapping on internal threading distinguishes it as a critical operation in the machining world.