Which description correctly differentiates turning from milling in machining?

• A. Turning uses a rotating workpiece with a stationary tool to create cylindrical shapes; milling uses a rotating cutter to remove material from a stationary workpiece across multiple axes.
• B. Turning uses a rotating workpiece with a stationary tool to create cylindrical shapes; milling uses a rotating cutter to remove material from a moving workpiece.
• C. Milling uses a rotating workpiece with a stationary tool to create cylindrical shapes; turning uses a rotating cutter to remove material from a stationary workpiece across multiple axes.
• D. Turning and milling both require the workpiece to move while the tool remains stationary.

Answer: (A)

Turning and milling differ mainly in which part rotates and how material is removed. In turning, the workpiece spins around its axis while the cutting tool stays largely in one place (or only feeds in), producing cylindrical shapes. In milling, the cutting tool rotates and removes material from a stationary workpiece (often moving the tool across the workpiece), which lets you cut features across multiple axes to create flats, slots, pockets, or complex contours. The description that turning uses a rotating workpiece with a stationary tool to create cylindrical shapes, and that milling uses a rotating cutter to remove material from a stationary workpiece across multiple axes, captures these distinctions accurately. Other options mix up which part rotates or imply the workpiece must move in milling or in both processes, which doesn’t match the standard definitions.