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chapter21 - Review Questions 21.1 What are the three basic...

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Review Questions: 21.1 What are the three basic categories of material removal processes? Machining – material removal by a sharp cutting tool, e.g., turning, milling, drilling Abrasive processes – material removal by hard, abrasive particles, e.g., grinding Nontraditional processes - various energy forms other than sharp cutting tool to remove material 21.2 What distinguishes machining from other manufacturing processes? Answer . Material is removed from the workpart so that the remaining material is the desired part geometry. 21.3 Identify some of the reasons why machining is commercially and technologically important? Variety of work materials can be machined c Most frequently used to cut metals Variety of part shapes and special geometric features possible, such as: Screw threads Accurate round holes c Very straight edges and surfaces Good dimensional accuracy and surface finish 21.4 Name the three most common machining processes. Answer . (1) Turning, (2) drilling, and (3) milling. 21.5 What are the two basic categories of cutting tools in machining? Give two examples of machining operations that use each of the tooling types. Single-point tool (turning) Multiple-cutting-edge tools (Milling) 21.6 What are the parameters of a machining operation that are included within the scope of cutting conditions? Answer . Speed, feed, depth of cut, and whether or not a cutting fluid is used. 21.7 Explain the difference between roughing and finishing operations in machining? Roughing cuts are used to remove large amounts of material from the starting work part as rapidly as possible, in order to produce a shape close to the desired form, but leaving some material on the piece for a subsequent finishing operation. Finishing cuts are used to complete the part and achieve the final dimensions, tolerances, and surface finish.
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