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44) A firm operates a flow shop building kitchen cabinetry

Question : 44) A firm operates a flow shop building kitchen cabinetry : 2034587

44) A firm operates a flow shop building kitchen cabinetry for recreational vehicles. The major activities of this process are listed below.

Task

Duration (hours)

Predecessor 1

Predecessor 2

Predecessor 4

A

4

--

B

6

--

C

2

A

D

6

A

E

3

B

C

F

3

B

C

G

5

D

E

F

H

1

G

a.Draw the appropriate network for this project.

b.What would the cycle time be if the goal is to produce 20 units per month (the plant operates

160 hours per month)?

c.What is the theoretical minimum number of workstations needed?

d.Balance with the most following tasks heuristic. What tasks are assigned to which stations?

e.What is the efficiency of the line obtained in part d?

(b) The cycle time is 160/20 = 8 hours; (c) This line requires at least 30/8 = 3.75 or 4 stations; (d) A and C are in Station 1; B is in Station 2; D is in Station 3; E and F occupy Station 4; and G and H are in Station 5. (e) Efficiency is 30/40 = .75 or 75 percent.

45) Hemo-tech, Inc., a biomedical technology and research laboratory, produces a standard blood filtering device on an assembly-line basis. Six basic tasks are performed along the assembly line. The time to perform each task and the tasks that must immediately precede each task are in the table below. Twenty pumps per 450-minute day must be produced by the assembly line.

Task

Preceding Task

Time to perform (min.)

A

--

5.40

B

A

3.20

C

--

1.50

D

B, C

2.80

E

D

17.10

F

E

12.80

(a)Draw the network diagram of the precedence relationships.

(b)Identify the absolute minimum and maximum cycle times.

(c)What is the cycle time required to meet demand?

(d)What is the minimum number of workstations required to meet the schedule?

(e)Balance this line using the most following tasks heuristic.

(f)What is the efficiency of the line obtained in part (e)?

(g)Can the efficiency of this solution be improved? Explain.

Solution
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Supply Chain Management 2 Years Ago 130 Views
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