Which operation uses a tap-wrench to cut screw threads?

Which operation uses a tap-wrench to cut screw threads?

• A. Threading
• B. Sawing
• C. Casting
• D. Forging

Answer: (A)

Cutting screw threads is done by threading, specifically tapping, which uses a tap and a tap-wrench to cut internal threads in a hole. The tap is held in the wrench and rotated to shear away metal and form the helical thread profile, with lubrication and gradual progression to cleanly establish the thread. This operation is aimed at creating internal threads that a screw or bolt can mate with, unlike other processes. Sawing removes material with a blade, not threads. Casting involves pouring molten metal into a mold to form a part, and forging shapes metal through deformation under force. So the tool-holding tapping action is unique to threading, making it the correct choice for cutting screw threads.

Cutting screw threads is done by threading, specifically tapping, which uses a tap and a tap-wrench to cut internal threads in a hole. The tap is held in the wrench and rotated to shear away metal and form the helical thread profile, with lubrication and gradual progression to cleanly establish the thread. This operation is aimed at creating internal threads that a screw or bolt can mate with, unlike other processes.

Sawing removes material with a blade, not threads. Casting involves pouring molten metal into a mold to form a part, and forging shapes metal through deformation under force. So the tool-holding tapping action is unique to threading, making it the correct choice for cutting screw threads.