Milling is typically used to generate which type of surfaces?

• A. Cylindrical surfaces
• B. Flat surfaces
• C. Spherical surfaces
• D. Helical surfaces

Answer: (A)

Milling uses a rotating cutting tool to remove material as it moves, and this setup is especially suited to shaping surfaces that wrap around the part, like the outer surface of a cylinder. When the cutter engages along a path that circles the workpiece while the tool or workpiece advances along an axis, the resulting surface has a constant radius about the axis—precisely a cylindrical surface. While milling can also produce flat faces and more complex shapes with the right tool paths, generating cylindrical surfaces is a natural and common outcome of many milling operations. Spherical or helical surfaces typically require more specialized setups or multi-axis coordination, so they’re not the typical default result of a standard milling pass.