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 Efficiency

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,

                      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:

  1. Management Losses;
  2. Motion Losses;
  3. Adjustment Losses;
  4. Losses resulting from lack of automation and
  5. Monitoring Losses

More articles of this writer:
  1. Industrial Engineering Formulas for Textile Students and Professionals
  2. Line Balance and Bottleneck in Garments Production Line
  3. Introductory of Inspection in Garments Industries
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Editor-in-Chief:

Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.


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