TransCanada Corp. is in the business of manufacturing toys using assembly lines.

Question

TransCanada Corp. is in the business of manufacturing toys using assembly lines. The time to perform each task and the tasks that must immediately precede each task are:

Task                       Precedence       Duration (minutes)

A                                 ---                    .30

B                                 ---                    .50

C                                 A, B                 .20

D                                 B                     .10

E                                 C, D                .20

F                                  D                     .60

G                                 F                      .40

Demand per week is 2800 units. The company works 5-day weeks and one 8-hour shift each day. Each shift/day has 2 snack breaks of 20 minutes (each). In addition, every hour there is a 6-minute rest break.

a. Balance the line (determine the workstation assignments) using the Longest Task Time first rule and calculate the Takt time.

b. Compute efficiency of the line in (a).

c. Can we improve the efficiency of the line (by using a different heuristic (rule))? Why or why not?

d. Suppose the demand is expected to increase to 3500 per week. Can we use longest operation time heuristic to rebalance the line? Why or Why not?

Explanation / Answer

TransCanada Corp. is in the business of manufacturing toys using assembly lines.

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