How to Calculate the Overall Equipment Effectiveness (OEE) of Apparel Industries

Last Updated on 19/12/2020

How to Calculate the Overall Equipment / Machine Effectiveness (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 Effectiveness (OEE): 
Overall Equipment Effectiveness (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. In a competitive business market there is no scope for any kind of wastages. For proper utilization of resources everything, right from Man, Machine to Material, needs to work flawlessly and seamlessly in unison. OEE may be very useful for garment manufacturing if practiced religiously. Effective monitoring using OEE may be helpful in finding out the key problematic areas or bottlenecks which are affecting the final effectiveness and may guide in solving them as per requirement.

Overall Equipment Effectiveness
Fig: Overall Equipment Effectiveness

Overall machine or equipment Effectiveness is the how to performs machine versus spec. In practically,

OEE = Availability X Performance Rate X Quality Product Rate

Where,

………………   ……Loading time – Down time
Availability = ………………………………………………………. X 100
……………………………….Loading time

………………    ……..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

Loading time: (600-35) = 565 min

Equipment stoppage/ down time: (30+20+25) = 75

(a) Failure : 30 min
(b) Set up : 20 min
(c) Adjustment : 25 min

Operating time : (565 – 75) = 490 min

Standard Cycle time : 0.35 min/ pieces

Processing quantity : 550 pieces/ day

Defective : 30 pieces.

Now,

…………….    …….Loading time – Down time
Availability = ……………………….…………………………. X 100
……………………..  ……….Loading time

…..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:

  • Management Losses;
  • Motion Losses;
  • Adjustment Losses;
  • Losses resulting from lack of automation and
  • Monitoring Losses

At last we can say that OEE is merely an indicator of equipment effectiveness for garment production.

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