Which category includes sawing, filing, and threading?

• A. Material Removal Processes
• B. Forming
• C. Joining
• D. Finishing

Answer: (A)

Material removal is the class of processes that achieve a final size, shape, or feature by removing material from a starting workpiece. Sawing, filing, and threading all cut away material to create the desired geometry: a blade slices through material, a file shears off small chips to refine size and finish, and threading cuts spiraled grooves by removing material to form threads. The other categories work differently: forming changes shape through plastic deformation without removing material; joining attaches pieces together; finishing focuses on improving surface quality and dimensional accuracy, sometimes with minor material removal but not as the primary method. Therefore, these operations belong to material removal processes.