1. The letters in the table below represent work elements in an assembly precedence diagram

work element

A

B

C

D

E

F

G

H

I

J

K

L

M

N

Time (min)

0.5

0.3

0.8

1.1

0.6

0.2

0.7

1.1

0.9

0.4

0.7

0.1

1.3

1.1

Preceding

-

-

A

B

C

B,C

D

E,G

F

H,I

J

J

K, L

M

(a) Construct the precedence diagram and determine the total work content time.

(b) Use the Kilbridge & Wester Method method to assign work elements to stations using a service time (Ts) of 1.8 min. How many workstations are needed?

(c) compute the balance delay for your solution.

(d) If M=2 how many workers company need for the system. (based on the number of workstations that are founded)