Like individual operator efficiency, measuring the efficiency of a production line is important for a factory. Daily line efficiency shows line performance. To calculate the efficiency of a line for a day, you will need the following data (information) from the line supervisor or line recorder.
1. Number of operators – how many operators worked in the line in a day
2. Working hours (Regular and overtime hours) – how many hours each of the operators worked or how many hours the line run in a day
3. Production in pieces – How many pieces are produced or total line output at the end of the day
4. Garment SAM – What is the exact standard minute of the style (garment)
Once you have above data you have to calculate following using above information -
a. Total minutes produced by the line: To get total produced minutes, multiply production pieces by garment SAM
b. Total minutes attended by all operators in the line: Multiply the number of operators by daily working hours and convert total hours into total minutes (multiplying by 60).
Now, calculate line efficiency using the following formula:
48 operations worked in a line for 8 hours. They produced 160 garments and SAM of the garment is 44.25 minutes.
Here,
Total minutes produced = (160 x 44.25) = 7080 minutes
Total minutes attended = (48 operator x 8 hours x 60) = 23040 minutes
Effiicnecy% = (7080 x100)/23040 % = 30.729%
For more example, refer to the following table. Data calculation formula has been given on the header row of the table.
1. Number of operators – how many operators worked in the line in a day
2. Working hours (Regular and overtime hours) – how many hours each of the operators worked or how many hours the line run in a day
3. Production in pieces – How many pieces are produced or total line output at the end of the day
4. Garment SAM – What is the exact standard minute of the style (garment)
Once you have above data you have to calculate following using above information -
a. Total minutes produced by the line: To get total produced minutes, multiply production pieces by garment SAM
b. Total minutes attended by all operators in the line: Multiply the number of operators by daily working hours and convert total hours into total minutes (multiplying by 60).
Now, calculate line efficiency using the following formula:
Line efficiency (in percentage) = (Total minutes produced by the line *100) /(Total minutes attended by all operators)
An Example
Let's calculate the line efficiency of one production line.48 operations worked in a line for 8 hours. They produced 160 garments and SAM of the garment is 44.25 minutes.
Here,
Total minutes produced = (160 x 44.25) = 7080 minutes
Total minutes attended = (48 operator x 8 hours x 60) = 23040 minutes
Effiicnecy% = (7080 x100)/23040 % = 30.729%
For more example, refer to the following table. Data calculation formula has been given on the header row of the table.
No. of
Operator (A) |
Working
hours (B) |
line output
(production) (C) |
Garment
SAM (D) |
Total
minutes
attended (E=A*B*60) |
Total Minute
produced (F=C*D) |
Line
Efficiency (%) (F/E*100) |
48
|
8
|
160
|
44.25
|
23040
|
7080
|
30.73
|
48
|
11
|
240
|
44.25
|
31680
|
10620
|
33.52
|
34
|
8
|
300
|
25
|
16320
|
7500
|
45.96
|
35
|
11
|
400
|
25
|
23100
|
10000
|
43.29
|
35
|
11
|
329
|
25
|
23100
|
8225
|
35.61
|
34
|
8
|
230
|
25
|
16320
|
5750
|
35.23
|
34
|
8
|
200
|
35
|
16320
|
7000
|
42.89
|
35
|
11
|
311
|
35
|
23100
|
10885
|
47.12
|
34
|
11
|
340
|
35
|
22440
|
11900
|
53.03
|
Here is one Video Guide for calculating overall efficiency.
Related Topics:
How to calculate SAM for a garment?
Garment CM cost estimation using SAM or SMV
The Concept of Operator's Performance Rating
How to calculate operator efficiency at work?
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