Ch. 21 theory of metal machining

21.6 Explain the difference between roughing and finishing operations in machining.

A roughing operation is used to remove large amounts of material rapidly and to produce a part geometry close to the desired shape. A finishing operation follows roughing and is used to achieve the final geometry and surface finish.

21.5 Which of the following cutting conditions has the strongest effect on cutting temperature: (a) feed or (b) speed

speed

What are the three basic categories of material removal processes?

(1) conventional machining (2) abrasive processes, (3) nontraditional processes

21.4 What are the two basic categories of cutting tools in machining? Give two examples of machining operations that use each of the tooling types

(1) single point tools, used in operations such as turning and boring; (2) multiple edge cutting tools, used in operations such as milling and drilling

21.3 Name the three most common machining processes

(1) turning (2) drilling, (3) milling

21.7 What is a machine tool?

A machine tool can be defined as a power driven machine that positions and moves a tool relative to the work to accomplish machining or other metal shaping process

21.5 What are the parameters of a machining operation that are included within the scope of cutting conditions?

Cutting conditions include speed, feed, depth of cut, and whether or not a cutting fluid is used.

21.8 How is the power required in a cutting operation related to the cutting force?

The power required in a cutting operation is equal to the cutting force multiplied by the cutting spee

21.1 Which of the following manufacturing processes are classified as material removal processes (two correct answers): (a) casting, (b) drawing, (c) extrusion, (d) forging, (e) grinding, (f) machining, (g) molding, (h) pressworking, and (i) spinning? Answer. (e) and (f

grinding and machining

21.2 A lathe is used to perform which one of the following manufacturing operations: (a) broaching, (b) drilling, (c) lapping, (d) milling, or (e) turning?

lapping

21.4 A roughing operation generally involves which one of the following combinations of cutting conditions: (a) high v, f, and d; (b) high v, low f and d; (c) low v, high f and d; or (d) low v, f, and d, where v = cutting speed, f = feed, and d = depth?

low v, high

What distinguishes machining from other manufacturing processes?

material is removed from the workpart so that the remaining material is the desired part geometry.