Which machining operation is typically used to create a cylindrical shape on a workpiece?

Turning is the correct choice for creating a cylindrical shape on a workpiece because it specifically involves rotating the workpiece against a cutting tool. Typically performed on a lathe, this process allows for the precise shaping of cylindrical forms, such as shafts, rods, and other round components. The continuous rotation of the workpiece while the cutting tool moves linearly facilitates the removal of material in a controlled manner, achieving the desired diameter, length, and surface finish.

In contrast, drilling is primarily focused on creating holes and does not inherently shape the outer profile of a workpiece. Milling involves cutting materials in a flat or angular manner using a rotating tool, ideal for creating complex shapes but not specifically for cylindrical features. Grinding is used for refining surfaces and achieving high precision on parts but is not fundamentally designed for the initial cutting of a cylindrical shape, which is the core function of turning.