DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Chapter 40, Problem 2P
Suppose in the sample problem at the end of this chapter that modular fixturing is used, which reduces the toolmaker’s labor to 4 hr and the design cost to $100 (4 hr at S25/hr), and that the material cost (modular elements) for the subplate structural elements, clamps, and so on was S300. What is the breakeven quantity for a modular fixture? (Note: The modular fixture is used for the job, then disassembled and returned to the toolroom. The parts are reused in other workholders.)
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ASSIGNMENT-2
Tool Box
Objective: To perform cutting and forming processes on a sheet metal to produce a tool box
with SIZE of 445mmL x 281mmW x 220mmH, with handle holes diameter 20mm.
Note : assume any missing dimensions
a) List the tools used
b) Write the steps to preapare
c) Sketch each steps
ILLUSTRATION 2: An operator manufactures 50 jobs in 6 hours and 30 minutes. If this time
includes the time for setting his machine. Standard time allowed for the job was:
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Production time per piece = 8 min
%3D
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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. 2RQCh. 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. 8RQCh. 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. 12RQCh. 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. 15RQCh. 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. 19RQCh. 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. 23RQCh. 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. 6PCh. 40 - A part has two holes located for drilling by...
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