Question

em 9.14 Question Help 3 per Sue Hains Appliances wants to establish an assembly line to manufacture its new product, the Micro Popcom Popper. The goal is to produce five poppers per hour The tasks, task times, and immediate predecessors for producing one Micro Popcorn Popper are as follows: estions: 3 Task tion 1 (0/1) А Performance Time Task Must Follow (mins Task Usted Below 10 12 А B 11 B,C 7 С 5 DE B D E F

Answer 1

Given, Demand = 5 poppers / hour

Calculated cycle rate = (60)/5 = 12 min

a) Theoretical minimum number of workstations= sum of total task times / cycle time

                             = (10+12+8+11+7+5)/12= 53/12 = 4.41 workstations = 5 workstations

b)

Task Table

Task	Task time	Precedence
A	10	-
B	12	A
C	8	A,B
D	11	B,C
E	7	C
F	5	D,E

The total station time is nothing but the calculated cycle time. So, total station time of each station is 12 min

In order of precedence relationship and largest task time: A->B->C->D->E->F

Workstation 1:

                             First task = A

                             Time left= 12-10 = 2 min

So, workstation 1: A

Workstation 2:

                             First task = B

                             Time left= 12-12 = 0 min

So, workstation 2: B

Workstation 3:

                             First task = C

                             Time left= 12-8 = 4 min

So, workstation 3: C

Workstation 4:               

                             First task = D

                             Time left= 12-11 = 1 min

So, workstation 4: D

Workstation 5:               

                             First task = E

                             Time left= 12-7 = 5 min

                             Second task = F

                             Time left= 5-5 = 0 min

So, workstation 5: E->F

Task Table

Work Station	Tasks	Workstation Time	Idle Time
1	A	10 min	2 min
2	B	12 min	0 min
3	C	8 min	4 min
4	D	11 min	1 min
5	E->F	12 min	0 min

Were you able to assign all the activities as per theoretical minimum workstations : Yes

c) Efficiency with 5 workstations = (sum of all tasks) / (no of workstations *   Cycle time)

        = (53)/ (5*12) = 0.8833% = 88.3%