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 7P

A part has two holes located for drilling by manual layout. If a drill jig is used. 0.5 min in processing time is saved for each piece. The labor rate is $9/hr. The overhead rate on the labor saved is 100%. Setup time is no more with than without the jig. The combined rate for interest, insurance, taxes, and maintenance is 35%. The cost of the jig is $500.

How many pieces must be made in one lot to make the jig worthwhile?
How many pieces must be made on the jig in one lot each month to earn the cost of the jig in 2 years?

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Chapter 40, Problem 6P

Chapter 41, Problem 1RQ

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2. Write a complete program to mill around the part. The endmill is .500 diameter, and you want to leave .010 stock for a finish pass. Enter a diameter offset number (Dn) command for tool DIAMETER Geometry of .520 for machining a roughing pass around part. And then define another pass around part using the same program coordinates but a different diameter offset number (Dn), and enter in the correct diameter offset value of .500 to machine part to the finish size. TOOL 1 has 0.520 in D21 and 0.500 in D01 Tool Speed (rpm) Feed (ipm) Operation Finish outside contour, x .50 deep Tooling 1 .5D endmill 1200 6. 25 R.25 2 PL. R .50 2.00 XO YO 4.0 SO. 1.0 SQ. 5 DA. EM 1.250- X-2.5 Y-2.0 START POINT

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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