6.8 REVIEW QUESTIONS AND EXERCISES
1. Define group technology and cellular manufacturing.
2. Discuss the advantages of implementing CMSs.
3. Compare and contrast traditional job shop systems with CMSs.
4. What is a part–machine processing indicator matrix? List and explain all the relevant information required for machine grouping and layout problems that can be stored in this matrix.
5. Discuss the advantages and disadvantages of the clustering algorithms discussed in this chapter.
6. In your own words, discuss the design and planning problems that arise in CMSs in practice.
7. Table 6.10 lists the sequence of machine types required for nine part types and also shows the annual volume of production for each.
(a) Set up a part machine matrix for the aforementioned data.
(b) Assuming the transfer batch size for part types 1–4 is 30, part types 5–8 is 15, and part type 9 is 10, determine the frequency of trips matrix using the matrix you set up in (a).
8. Table 6.11 lists the sequence of machine types required for 12 part types and also shows the annual volume of production for each.
(a) Set up a part machine matrix for the aforementioned data.
(b) Assuming the transfer batch size for part types 1, 4, and 5 is 60; part types 2, 3, 6, 10, 11, and 12 is 20; and part types 7–9 is 50, determine the frequency of trips matrix using the matrix you set up in (a).
9. Determine machine groups and part families for the data in Exercise 7 using
(a) ROC algorithm
(b) BE algorithm
(c) R&CM algorithm
(d) SC algorithm
(e) Mathematical programming approach
(For (e), try fixing the number of part families to 2 and 3).
TABLE 6.10
Part Routing and Volume Information for Exercise 7
Part Type # Sequence of Machine Types Visited Production Volume
1 3, 5, 2 3000
2 3, 5 1000
3 4, 6, 1 8550
4 1, 4 2750
5 6, 4 9000
6 1, 6 500
7 2, 5, 3 300
8 5, 3 3600
9 6, 1, 4 4110