South Carolina Furniture Inc. produces all type of office furniture. The "Executive Secretary" is a chair that has been designed using ergonomics to provide comfort during long work hours. The chair sells for $130. There are 480 minutes available during the day, and the average daily demand has been 50 chairs. There are 8 tasks.
Tasks Performance Time Task Must Follow Tasks Listed below
A 4 -
B 7 -
C 6 A,B
D 5 C
E 6 D
F 7 E
G 8 E
H 6 F,G
1. Draw a precedence diagram of the operation.
2. What is the cycle time for this operation?
3. What is the theoretical minimum number of work stations?
4. Assign tasks to work stations using the longest task time heuristics (longest operating time rule).
5. How much total idle time is present each day?
6. What is the overall efficiency of the assembly line?