6.2.2 Selection of Final Assembly Process
To make more realistic condition, the "Input" elements "In 1" and "In 2" are assumed to supply buffers 1 and 2 in batch sizes of 20 according to an exponential distribution with rate of 900 seconds (15 minutes). This is the estimated time to move the components to the buffers of "Transmission Assembly" and "Grip Housing Assembly" stations. Using this assumption, an investigation was conducted to determine the proper size of the rest of the buffers. The important buffers will be the buffers before the bottleneck station: "Final Assembly" with the longest cycle time (72.7 seconds). The results of the investigation are summarized in the following table.
No.
|
Station
|
Buffer size = 1
|
Buffer size = 5
|
Buffer size = 10
|
Buffer size = 20
|
1
|
In 1 (Inou_1)
|
53.7
|
66.25
|
53.33
|
48.88
|
2
|
In 2 (Inou_2)
|
29.24
|
31.71
|
29.57
|
32.09
|
3
|
Buffer 1 (Buff_3)
|
|
|
|
|
4
|
Buffer 2 (Buff_4)
|
|
|
|
|
5
|
Transmission Assembly 1 (Mach_5)
|
59.9
|
73.98
|
76.62
|
77.24
|
6
|
Transmission Assembly 2 (Mach_6)
|
61.72
|
70.22
|
77.94
|
77.16
|
7
|
Transmission Assembly 3 (Mach_7)
|
62.14
|
71.77
|
75.54
|
77.75
|
8
|
Grip Housing Assembly (Mach_8)
|
58.25
|
69.74
|
75.12
|
74.83
|
9
|
Buffer 3 (Buff_9)
|
|
|
|
|
10
|
Buffer 4 (Buff_10)
|
|
|
|
|
11
|
Final Assembly (Mach_11)
|
60.7
|
71.63
|
74.94
|
73.67
|
12
|
Buffer 5 (Buff_12)
|
|
|
|
|
13
|
Testing & Packaging (Mach_13)
|
57.88
|
69.98
|
72.85
|
70.82
|
14
|
Buffer 6 (Buff_14)
|
|
|
|
|
15
|
Repair (Mach_15)
|
21.92
|
44.68
|
20
|
21.55
|
|
Finish Output
|
244
|
295
|
304
|
294
| |
