23.1 Introduction
v Typical products (of round shapes) are as small as miniature screws for the hinges of eyeglass
frames and as large as turbine shafts for hydroelectric power plants, rolls for rolling mills,
cylinders, and gun barrels.
v Turning (one of the most basic machining processes) means that the part is rotated while it is
being machined. The starting material is generally a workpiece that has been made by other
processes, such as casting, forging, extrusion, drawing, or powder metallurgy.
v Turning processes (typically are carried on a lathe) are outlined in Fig. 23.1 and Table 23.1.