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85. What are the relative advantages and disadvantages of mechanical presses versus hydraulic presses in sheet metalworking? 86. What is the Guerin process? 87. Identify a major technical problem in tube bending. 88. Distinguish between roll bending and roll forming. 89. What are the three basic categories of material removal processes? 90. What distinguishes machining from other manufacturing processes? 91. Identify some of the reasons why machining is commercially and technologically important. 92. Name the three most common machining processes. 93. What are the two basic categories of cutting tools in machining? Give two examples of machining operations that use each of the tooling types. 94. What are the parameters of a machining operation that are included within the scope of cutting conditions?