Question

The desired daily output for an assembly line is 300 units. This assembly line will operate 425 minutes per day. The following table contains information on this product's task times and precedence relationships: TASK TASK TIME (SECONDS) IMMEDIATE PREDECESSOR A 35 — B 40 A C 35 A D 40 B E 15 C F 75 C G 45 E-F H 30 D-G What is the efficiency of your line balance, assuming it is running at the cycle time in part b? In percentage

Answer 1

We will first draw network diagram as below:

Cycle time = Production time per day/ output per day = 425 minutes per day/ 300 units per day = 1.41 minutes or 85 seconds.

Number of workstations = Sum of total task times/ cycle time = (35+40+40+30+35+15+45+75)/ (85) = 3.7 ~ 4 workstations

Now, we will assign tasks to the workstations following a rule- in this case we are prioritizing based on longest task time. The maximum time of activities allocated to workstation is the cycle time.

- Work station 1 : A (35), B (40)

- Work station 2: C (35), D(40)

- Work station 3: F (75)

- Workstation 4: E(15), G (45)

- Workstation 5: H(30)

Hence, in actual there is a requirement of 5 workstations.

Line efficiency = Sum of all task times/ (actual number of workstations)* (cycle time)

Line efficiency = (35+40+40+30+35+15+45+75)/ (5*85) = 315/ 425 = 74.12%

Hence,the line efficiency is 74.12%

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