Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Textbook Question
Chapter 12, Problem 14QLP
Do you generally agree with the cost ratings in Table 12.6? If so, why?
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Complete the following comparison table with the possible answers indicated in each comparison factor:
The table below provides the parameters for a new current state value stream map for the family of retainers at the Jensen Bearings Inc. firm described in the chapter. This table depicts the value stream after Kline Steel agrees to accept daily orders for steel sheets and also agrees to deliver on a daily basis. Calculate each component of the new value stream's reduced lead time. Jensen Bearings operates 5 days per week.
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Overall Process Attributes
Average demand:
2,700/week
(1,400
"L";
1,300
"S")
Batch size: 1,000
Number of shifts per day: 1
Availability: 8 hours per shift with two 30 minute lunch breaks
Process Step 1
Press
Cycle
time=4
seconds
Setup
time=2
hours
Uptime=90%
Operators=1
Every Part
Every=1
week
WIP=1
day of sheets (before Press)
Process Step 2
Pierce & Form
Cycle
time=23
seconds
Setup
time=30
minutes
Uptime=100%
Operators=1
WIP=1,100
"L",
1,250
"S" (before Pierce & Form)
Process…
A process currently services an average of
59
customers per day. Observations in recent weeks show that its utilization is about 90 percent, allowing for just a 10 percent capacity cushion. If demand is expected to be
70
percent of the current level in five years and management wants to have a capacity cushion of just
4
percent, what capacity requirement should be planned?
The needed capacity requirement is
nothing
customers per day. (Enter your response rounded up to the next whole
number.)
Chapter 12 Solutions
Manufacturing Engineering & Technology
Ch. 12 - Why are steels more difficult to cast than cast...Ch. 12 - What is the significance of hot spots in metal...Ch. 12 - What is shrinkage allowance? Machining allowance?Ch. 12 - Explain the reason for drafts in molds.Ch. 12 - Prob. 5RQCh. 12 - What are light castings and where are they used...Ch. 12 - Name the types of cast irons generally available,...Ch. 12 - Comment on your observations regarding Fig. 12.5.Ch. 12 - Describe the difference between a runner and a...Ch. 12 - What is the difference between machining allowance...
Ch. 12 - What is dross? Can it be eliminated?Ch. 12 - Describe your observation concerning the design...Ch. 12 - If you need only a few castings of the same...Ch. 12 - Do you generally agree with the cost ratings in...Ch. 12 - Describe the nature of the design differences...Ch. 12 - Note in Fig. 12.5 that the ductility of some cast...Ch. 12 - Do you think that there will be fewer defects in a...Ch. 12 - Explain the difference in the importance of drafts...Ch. 12 - What type of cast iron would be suitable for...Ch. 12 - Explain the advantages and limitations of sharp...Ch. 12 - Explain why the elastic modulus, E, of gray cast...Ch. 12 - If you were to incorporate lettering or numbers on...Ch. 12 - The general design recommendations for a well in...Ch. 12 - The heavy regions of parts typically are placed in...Ch. 12 - What are the benefits and drawbacks to having a...Ch. 12 - When designing patterns for casting, patternmakers...Ch. 12 - Using the information given in Table 12.2, develop...Ch. 12 - The part in Figure P12.28 is to be cast of 10% Sn...Ch. 12 - Describe the general design considerations...Ch. 12 - Add more examples of applications to those shown...Ch. 12 - Explain how ribs and serrations are helpful in...Ch. 12 - List casting processes that are suitable for...Ch. 12 - Small amounts of slag and dross often persist...Ch. 12 - If you need only a few units of a particular...Ch. 12 - For the cast metal wheel illustrated in Fig....Ch. 12 - Assume that the introduction to this chapter is...Ch. 12 - In Fig. P12.37, the original casting design shown...Ch. 12 - An incorrect and a correct design for casting are...Ch. 12 - Using the method of inscribed circles, shown in...Ch. 12 - A growing trend is the production of patterns and...Ch. 12 - Repeat Problem 12.40 for the case where (a) a...
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