To know the performance of a garment factory and for the comparative study of the sewing line performance, we measure production line efficiency. So, likeindividual operator efficiency, measuring the efficiency of a production line is important for a factory.
Daily line efficiency shows line performance.
Production Line Efficiency Calculation - Information required
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 ran 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 the above data you have to calculate the following using the above information -
a. Total minutes produced by the line:
To calculate 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 - Calculating Production Line Efficiency
Let's calculate the line efficiency of one production line.
48 operators worked in a line for 8 hours. They produced 160 garments and the SAM of the garment (style) 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 examples, refer to the following table. The data calculation formula has been given on the header row of the table.
No. of | Working | line output | Garment | Total minutes | Total Minute | Line |
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?
