First shift employees at General Motors work from 6am to 2pm Monday through Friday. Everyone on the assembly line is allowed a 30 minute lunch and two 20 minute breaks, but other cross-trained associates cover lunches and breaks for the associates on the assembly line so the line doesn't stop. The processes of the assembly line have the following dependencies:
Task___________ Predecessor_____________ Average Time (sec)
A..............................none............................................45
B..............................none............................................90
C................................A............................................110
D................................B............................................120
E..............................none...........................................100
F...............................C...............................................15
G...............................E.............................................115
H............................F, D, G..........................................35
The Plant Manager needs first shift to achieve an output of 100 cars.
Compute the Takt time for the line.
What is the theoretical minimum number of workstations?
Draw the precedence diagram. Then assign tasks to work stations and you must use the largest eligible task heuristic rule to break any ties. Show which tasks are assigned to each workstation.
Compute the efficiency and percent idle time for the system .
What is the maximum output that could be achieved by a single assembly line in 8 hours?