DeGarmo's Materials and Processes in Manufacturing

12th Edition

ISBN: 9781118987674

Author: J. T. Black, Ronald A. Kohser

Publisher: WILEY

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Machining Processes and Machine Tools

Machining is represented as the process in which an excessive amount of substance is eliminated from the particular element in the form of pieces. In machining, cutting tools such as rotary tools, lathe, drill press, grinder, chop saw, welders, and many …

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Textbook Question

Chapter 40, Problem 4P

Notice that the holes in the part in Figure 49.9 need to be countersunk after they are drilled. How can the jig be designed to put the countersinks on the mounting holes while the part is in the jig, or would this operation be done afterward?

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Chapter 40, Problem 2P

Chapter 40, Problem 6P

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A NC lathe cuts two passes across a cylindrical workpiece under automatic cycle. The operator loads and unloads the machine. The starting diameter of the work is 3.00 in and its length = 10 in. The work cycle consists of the following steps (with element times given in parentheses where applicable): 1 - Operator loads part into machine, starts cycle (1.00 min); 2 - NC lathe positions tool for first pass (0.10 min); 3 - NC lathe turns first pass (time depends on cutting speed); 4 - NC lathe repositions tool for second pass (0.4 min); 5 - NC lathe turns second pass (time depends on cutting speed); and 6 - Operator unloads part and places in tote pan (1.00 min). In addition, the cutting tool must be periodically changed. This tool change time takes 1.00 min. The feed rate = 0.007 in/rev and the depth of cut for each pass = 0.100 in. The cost of the operator and machine = $39/hr and the tool cost = $2.00/cutting edge. The applicable Taylor tool life equation has parameters: n = 0.26 and…

The Conner Company uses a two-step process for making wooden boards with holes in them. Step 1 is drilling and Step 2 is sanding. Drilling is done using an electronic drill that takes 8 minutes to set up and ½ minute to drill each hole. Step 2 involves a sanding machine with a 20 minute setup time that processes each board (regardless of how many holes are in it) in 10 minutes. If all orders are for a single batch of 10 boards, and each board has 14 holes what is the capacity of this 2-step process? (Assume that both machines only need to be set up once.)

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Chapter 40 Solutions

DeGarmo's Materials and Processes in Manufacturing

Ch. 40 - What are the two primary functions of a...Ch. 40 - Prob. 2RQ Ch. 40 - An early treatise defined a jig as a device that...Ch. 40 - Does an ordinary vise qualify as a fixture? Why or...Ch. 40 - What basic criteria should be considered in...Ch. 40 - In any part drawing, what are the critical...Ch. 40 - What difficulties can result from not keeping...Ch. 40 - Prob. 8RQ Ch. 40 - Which of the basic design principles relating to...Ch. 40 - What are the two reasons for not having drill...

Ch. 40 - Why does the use of down milling often make it...Ch. 40 - Prob. 12RQ Ch. 40 - A large assembly jig for an airplane-wing...Ch. 40 - Explain why the use of a given fixture may not be...Ch. 40 - Prob. 15RQ Ch. 40 - In the clamps shown in Figure 40.20, what is the...Ch. 40 - What are other common types of clamp?Ch. 40 - What is the purpose of dimensioning the...Ch. 40 - Prob. 19RQ Ch. 40 - In Figure 49.9. why arent there three points put...Ch. 40 - Which set of locators in Figure 49.9 establishes...Ch. 40 - What are the four stages of the SMED methodology...Ch. 40 - Prob. 23RQ Ch. 40 - How could the intermediate jig concept be used in...Ch. 40 - Develop a sequence of operations to produce the...Ch. 40 - Suppose in the sample problem at the end of this...Ch. 40 - Notice that the holes in the part in Figure 49.9...Ch. 40 - Prob. 6P Ch. 40 - A part has two holes located for drilling by...

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