Francis Johnson’s plant needs to design an efficient assembly line to make a new

Question

Francis Johnson’s plant needs to design an efficient assembly line to make a new product. The assembly line needs to produce 15 units per hour, and there is room for only four workstations. The tasks and the order in which they must be performed are shown in the following table. Tasks cannot be split, and it would be too expensive to duplicate any task.

b. What is the workstation cycle time required to produce 15 units per hour? (Round your answer to 1 decimal place.)

Workstation cycle time= 4.0 minutes

d. Balance the line to use the fewest possible workstations to meet the cycle time found in part b. Use whatever method you feel is appropriate. What is the efficiency of your line balance, assuming the line operates at the cycle time from part b? (Round your answer to 1 decimal place.)

Efficiency  %

TASK TASK TIME
(MINUTES) IMMEDIATE
PREDECESSOR A 1 — B 2 — C 3 — D 1 A, B, C E 3 C F 2 E G 3 E

Explanation / Answer

b) Desired output is 15 units per hour

Workstation cycle time = 60/Desired output = 60/15 = 4 min

d) Assigning task to workstation:

Workstation 1 = A,B or C can be allotted. Let us allot A & C as total time is 4 min as per workstation time = A,C

Workstation 2 = B is allotted. Time left is 2 min. Only D or E can be allotted. Allotting D due to time constraint = B,D

Workstation 3 = Allotting E. Time left is 1 min. So no additional task can be assigned

Workstation 4 = F. Time left is 2 min. So, no additional task can be assigned

Workstation 5 = G

Efficiency = Total task time/(Number of workstation*Cycle time)*100 = (1+2+3+1+3+2+3)/(5*4) = 15/20*100 = 75%

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