440 Milling Machines CHAPTER 26 LEARNING OBJECTIVES After studying this chapter, you will be able to: • Explain how milling machines operate. • Identify the various types of milling machines. • Select, mount, and care for milling cutters. • Calculate l cutting g speeds and feeds. • Safely prepare a machine and mount work for a variety of milling operations. • Practice proper safety precautions when operating milling machines. CHAPTER OUTLINE 26.1 Types of Milling Machines 26.1.1 26 .1 1 Column-and-Knee C ol um n d Kn ee Milling M M il li Machines Ma M Ma h h h h h i in in in i es es es s 26.1.2 26 26 2 26 .1 .1 .1 .2 2 2 .2 Fixed-Bed F ix x x ed ed ed B -B -B -B ed ed ed ed ed Milling M M M M il li li ng ng Machines M c hi hi h h ne ne e 26.1.3 3 3 3 Methods M M M M M e o ds s ds ds of o o o o Con Co Co o C nt n n rol r l l l 26.2 26 26 26 2 2 2 2 Mi M M M M il il il il ling li li li n ng ng g ng Categories C C C C at at at at eg ri ie 26.3 6. 6 26 Milling M M M M il il il i li ng ng Methods M M ho d d 26.4 26 26 26 6. 4 .4 4 Milling M M M M i i i i i g g g Cutters C u ut t 26 6 6 6 4.1 4 .4 Type p p es es e of o o o o f f f f Milling in in n g C Cu C Cu C tters tt tt tt tt t er er r er s s 26.4 4 .4 .4 4 4 2 .2 .2 2 2 Care C C C e o of of Milling M M M M il lli li li li li ng ng ng ng Cutter t t te te te r rs r r 26.4 4 4 4 4 3 .3 Cutter C C C C C ut ut tt ut ut t r r r Holding ld ld ld d in in in and a Driving Dr D D Devices D D D i i ce ce s s s f fo fo fo fo r Horizontal o ri o Mills M il 26 26 26 2 26 4.4 4 4 .4 4 4 Care r e of Arbors A r s 26 6 4 4 5 Cutting n Fluids 26 26 .4 .5 Cut ti ng ng Fluids 26.5 26 5 Cu C ut ting t Speeds e and Feeds ee e e ed ed ed ed ed ed s s s 26.5.1 Cutting Speed ee e e 26.5.2 Feed F F F F e e e d d d 26.5.3 6 6 6 5 5 .5 5 5 5 3 3 3 3 3 Calculating C C C C C C C c cu c cu cu u la a la t t ng g Cutting ut t t ti ti ti i ti ti n n ng n Speeds S S pe ed ed d s s s s a an an a d d Feeds ed 26.6 26 .6 Workholding W W or kh h di ng ng g Attachmentsc A A A tt ac ac ac hm hm hm hm 26 26 6.1 .6 6 .1 Visess 26.6.2 2 6 .2 Va V V V a ac uum-Operated Systems and Magnetic Chucks 26.6.3 6 Rotary and Index Tables 26.6.4 2 6 Dividing Head 26.7 7 Horizontal o Milling ll l l in Opera Op er er r at a ionss o o o o n ns ns ns 26.7.1 7 Milling M M M il il il ll l g Flat F F F la la a t t t t Surfacesscf Su Su S rf rf r f f f ac ac ac ac c es es 26.7.2 26 26 26 . 7 7 7 7 Sq S S S S qu q aring a ar ar ar n n n n n n g g g Stockc S k k k k k 26.7.3 26 7 .7 .7 7 7 7 .3 3 3 3 3 Face F F F Millingl M Mi Mi Mi M ll ll ll g g 26.7.4 7 .4 .4 4 4 4 4 Side, S S S S d Straddle, tr t r r r ad ad ad ad ad ad a d d d and nd nd nd Gang Millingili Mi Mi Mi i Mi i l l l l l 26.7.5 2 7 Slottingl S S S S S S S o 26.7.6 2 7 Slitting S S S li li 26.7.7 7 Drilling D in n n in and d d d d Boring Bo Bo Bo Bo ri r r n 26.8 Ve er e tical Milling Mi Mi Mi M M ll ll ll i Machine Ma Ma Ma h h ch in in n in in in Operationsip p e e e r r r r at at at 26.8.1 6 . .8 .8 8 .1 1 1 1 Toolholders T oo ol o h h lh for Vertical Millingii M Mi Mi Mi Mi M Mi Mi ll ll ll ll ll ll ll ll ll in in in in in i i i i g g g g g g g g g Machines h h h h h Milling Flat Surfaces 26.8.2 26 2 26 6 26 2 8 Squaring Stock 26.8.3 8 Machining Angular Surfaces a a a a ce ce e ce ce e e s s s 26.8.4 8 Milling a Slot or Keyway 26.8.5 8 Machining Internal Openings in in n in gs gs s s gs 26.8.6 8 Machining Multilevel Surfacesc ac ac es e 26.8.7 8 Drilling and Boring 26.8.8 8 ndustrial Applicationsat 26.9 In ndustrial Ap plic ions 26.10 Milling M Safety Practices