A process where a rotary cutter removes material by advancing onto a workpiece is called?

• A. Milling
• B. Drilling
• C. Turning
• D. Grinding

Answer: (A)

Material removal with a rotating cutter that advances into the workpiece is milling. In milling, a cutting tool (like an end mill) rotates and the workpiece (or the tool) moves so that the cutter gradually enters the material, shearing away material to create slots, pockets, or profiles. This setup emphasizes the motion of the cutter into the workpiece to remove material.

This differs from drilling, where a drill penetrates into the material along its axis to make a hole; turning, where the workpiece itself typically rotates while a tool orbits or feeds along its surface to shape external features; and grinding, which uses an abrasive wheel to wear away material in fine finishes rather than forming features with a rotating cutting edge advancing into the workpiece.