MACHINING Copyright Goodheart-Willcox Co., Inc. Chapter 26 Milling Machines 445 26.2 Milling Categories The two main categories of milling operations are face milling and peripheral milling. In face milling opera- g tions, the surface being machined is parallel with the cut- ter face, Figure 26-9. Variations of face milling include: • Conventional face milling. Used to machine large flat surfaces. • End milling. Done to machine a slot in a part. The diameter of the cutter is less than the width of the part, Figure 26-10A. • Pocket milling. A form of face milling in which pockets, or cavities, are milled out with an end mill cutter, Figure 26-10B. • Surface contouring. A complex form of face milling that is usually done with a ball-nose end mill cutter to create a three-dimensional surface, Figure 26-10C. Switch to engage rapid traverse movement A B Longitudinal feed handwheel Power feed lever Feed rate adjustment dial On/off switch for power feed Goodheart-Willcox Publisher Figure 26-8. A—A vertical mill with a power feed attachment that has rapid traverse capabilities. B—A close-up of the power feed attachment. Goodheart-Willcox Publisher Figure 26-9. In face milling, the surface being machined is parallel with the cutter face. A B C Pocket being g machined Contoured surface Cutting toolholder Cutting tool with inserts BIG Kaiser Precision Tooling, Inc. BIG Kaiser Precision Tooling, Inc. Dmitry Kalinovsky/Shutterstock.com Figure 26-10. A—An example of end milling. B—An example of pocket milling. C—An example of surface contouring.