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6-control_phase_assignment.docControl Phase Assignment Document
In this Phase SPC is used to measure, monitor and control the improved process. This phase will consider
1. Control charts
2. Lean tools
Reading
Text book
1. Chapter 10
2. Chapter 34
3. Chapter 35
4. Chapter 36
5. Chapter 37
6. Chapter 38
7. Chapter 44
8. Review notes under Control Phase
Assignments Due Dates : August 5
Chapter 10
1. Exercises 6
2. What are the advantages and disadvantages of using variables rather than attributes in control charts.
3. The bore size of a component to be used in an assembly is a critical dimension. Random samples of 4 are chosen.
The summary information below is for 25 Samples.
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25
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25
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The specification limits are 4.40.2 mm lumes
a. Assuming the process is in control, estimate the process standard deviation
b. Find the Xbar and R chart control limits
c. What are your conclusion regarding the ability of the process to produce items conforming to specifications? Find Cp and Cpk.
d. Assuming that if an item exceeds the upper specification limit it can be reworked and if it is below the lower limit it must be scrapped, what percent scrap and rework is the process now producing?
e. It the process were centered on at u = 4.4, what would be the effect on the percent scrap or rework?
f. The unit cost of scrap and rework are $2.40 and $0.75 respectively. The Daily production rate is 1200. Find the total cost of scrap and rework
Chapter 37
4. Exercise 3
Chapter 44
5. Lean
a. The goal of any improvement process is to eliminate all wastes in the process.
b. Define all the possible wastes and identify their sources.
c. List all the metrics related to lean
d. What is 5S?
e. What are the six big losses under TPM?
f. Define: Availability, Performance efficiency, Rate of Quality Products and Overall equipment effectiveness. What are the ideal conditions?
