The Action Toy Company has decided to manufacture a new toy tractor, the production of which...
The Action Toy Company has decided to manufacture a new toy tractor, the production of which is broken into six steps. The demand for the tractor is 4,800 units per 40-hour workweek. TASK, PERFORMANCE TIME(SECONDS), PREDECESSORS
A 20 None
B 30 A
C 15 A
D 15 A
E 10 B,C
F 30 D,E
A) Draw a precedence diagram
B) What is the cycle time?
C) What is the theoretical minimum number of workstations?
D) Assign tasks to workstations
E) How much total idle time is present in each cycle?
Homework Answers
A
B.cycle time = number of hours / number of units to be made
= 40x60 /4800 = 0.5 minutes = 30 seconds
C Theoritical minimum number of workstations = task time /cycle time = 120 /30 =4
However, praactically, the process would need 5 workstations.
D Assignment by highest number of followers
| WS | activities | Time | Idle time |
| 1 | A | 20 | 10 |
| 2 | B | 30 | 0 |
| 3 | C,D | 30 | 0 |
| 4 | E | 10 | 20 |
| 5 | F | 30 | 0 |
Idle time per cycle = 30/5 = 6 seconds
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