DataSpan, Inc., automated its plant at the start of the current year and install
ID: 2448782 • Letter: D
Question
DataSpan, Inc., automated its plant at the start of the current year and installed a flexible manufacturing system. The company is also evaluating its suppliers and moving toward Lean Production. Many adjustment problems have been encountered, including problems relating to performance measurement. After much study, the company has decided to use the performance measures below, and it has gathered data relating to these measures for the first four months of operations. Month 1 2 3 4 Throughput time (days) ? ? ? ? Delivery cycle time (days) ? ? ? ? Manufacturing cycle efficiency (MCE) ? ? ? ? Percentage of on-time deliveries 91% 86% 83% 79% Total sales (units) 3,210 3,072 2,915 2,806 Management has asked for your help in computing throughput time, delivery cycle time, and MCE. The following average times have been logged over the last four months: Average per Month (in days) 1 2 3 4 Move time per unit 0.4 0.3 0.4 0.4 Process time per unit 2.1 2.0 1.9 1.8 Wait time per order before start of production 16.0 17.5 19.0 20.5 Queue time per unit 4.3 5.0 5.8 6.7 Inspection time per unit 0.6 0.7 0.7 0.6
Explanation / Answer
Using the following formulae; the ratios are computed:
Throughput time = Move time + Process time + Inspection time + Queue time
Delivery cycle time = Throughput time + Wait time
MCE =Process time/Throughput time
Month
1
2
3
4
Move time per unit
0.4
0.3
0.4
0.4
Process time per unit
2.1
2
1.9
1.8
Inspection time per unit
0.6
0.7
0.7
0.6
Queue time per unit
4.3
5
5.8
6.7
Throughput time
8.4
10
11.8
13.5
Add:
Wait time
16
17.5
19
20.5
Delivery cycle time
24.4
27.5
30.8
34
MCE
0.25
0.2
0.16
0.13
Month
1
2
3
4
Move time per unit
0.4
0.3
0.4
0.4
Process time per unit
2.1
2
1.9
1.8
Inspection time per unit
0.6
0.7
0.7
0.6
Queue time per unit
4.3
5
5.8
6.7
Throughput time
8.4
10
11.8
13.5
Add:
Wait time
16
17.5
19
20.5
Delivery cycle time
24.4
27.5
30.8
34
MCE
0.25
0.2
0.16
0.13
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