As part of a major plant renovation project, the industrial engineering departme

Question

As part of a major plant renovation project, the industrial engineering department has been asked to balance a revised assembly operation to achieve an output of 240 units per eight-hour day. Task times and precedence relationships are as follows Duration Immediate Task (minutes) Predecessor 0.2 0.4 0.2 0.4 1.2 1.2 Do each of the following b. Determine the minimum cycle time, the maximum cycle time, and the calculated cycle time. (Round your answers to 1 decimal place.) The minimum cycle time The maximum cycle time Calculated cycle time minutes per unit minutes per unit minutes per unit c. Determine the minimum number of stations needed. (Round your answer to the next whole number.) Minimum number of stations d. Assign tasks to workstations on the basis of greatest number of following tasks. Use longest processing time as a tiebreaker. If ties still exist, assume indifference in choice Work stations Following Tasks (Click to select) Click to select) Click to select) Click to select) IV e. Compute the percentage of idle time for the assignment in part d. Use the actual bottleneck cycle time in your calculation. (Round your answer to 2 decimal places. Omit the "%" sign in your response.) Percentage of idle time %

Explanation / Answer

part a) not there in quetsion

part b)

minimum cycle time= maximum task time = 1.2 minutes/unit

Maximum cycle time= 0.2+ 0.2 + 0.4+ 0.4+ 1.0+1.2+1.2 = 4.6 minutes/uniit

Calculated cycle = CT = OT/output = (480min/day)/(240 units/day) = 2 minutes/unit

<480 min is because its a 8 hour work day - > 8*60 minutes>

Part c)

Minimum number of stations needed = maximum cycle time / calculated cycle time = 4.6/2 = 2.3 -> rounds up to 3 stations

ans: 3 stations

part d) the tasks can be assigned in a manenr to require only 3 stations (as calculated in part (c). however, since the quetsion says 4 workstations, the tasks can be assigned as below:

Workstation

Part e)

for calculating idle percentage - detailing the above table:

Idle Percentage = (0.8 + 0.8 + 0.8 + 1 )/(4*2) = 3.4/8 = 42.5%

Workstation

Following tasks I A, B, C, D II E III F IV G

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