## How to Calculate the Overall Machine Efficiency of Apparel Industries

How to Calculate the Overall Equipment/Machine Efficiency (OEE) of Garments Industries
Joyankar Mojumder
Inspector
Modern Testing Services (BD) Ltd.
280, East Narshinghpur, Ashulia, Savar, Dhaka.
Email: mozumderjoy@yahoo.com

What is Overall Equipment/Machine Efficiency (OEE):

OEE is the framework for measuring the efficiency and effectiveness of a process, by breaking it down into three constituent components (Availability, Performance and Quality product rate). It helps to measure a problem so that easily can fix it and provides a standardized method of benchmarking progress. OEE identifies the percentage of planned production time that is truly productive.
Overall machine or equipment efficiency is the how to performs machine versus spec. In practically,

OEE= Availability X Performance Rate X Quality Product Rate

Where,

Availability = ………………………………………. X 100

Standard cycle time x Processing quantity
Performance = …………………………………………………. x 100
Operating time

Processing quantity – Defective quantity
Quality product rate = ……………………………………………………………. X 100
Processing quantity

Let,
• Working hours per day: 10 hours x 60 min = 600 min
• Shut down (SD): 35 min
• Equipment stoppage/ down time: (30+20+25) = 75
(a) Failure : 30 min
(b) Set up : 20 min

• Operating time : (565 - 75) = 490 min
• Standard Cycle time : 0.35 min/ pieces
• Processing quantity : 550 pieces/ day
• Defective : 30 pieces.
Now,

Availability = ……………………………………………. X 100

565 – 75
= ………………….. x 100
565

= 86.72%

Standard cycle time x Processing quantity
Performance = ………………………………………………….. x 100
Operating time

0.35 x 550
= ……………………. X 100
490

= 40.35%

Processing quantity – Defective quantity
Quality product rate = ……………………………………………………………………. X 100
Processing quantity

550 – 30
= …………….. x 100
550

= 94.54%

So, OEE = Availability X Performance Rate X Quality Product Rate

= 0.8672 X 0.4035 X 0.9454

= 33.08%

Low Machine efficiency rate due to man:

1. Management Losses;
2. Motion Losses;