Overall Equipment Effectiveness (OEE)

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OEE is a measure of how well a planned production time of an equipment is utilized to produce good products. It can be measured from 0% to 100%.

Its not only the equipment, effectiveness of achieving target number of good products, of all operations, whether it is manual, automatic or semiautomatic can be measured using OEE.

Now we shall discuss all factors which will affect OEE.

OEE Factors

OEE depends on three major factors.

  • Availability
  • Performance
  • Quality

We will be discussing these three factors in the following sections…

How to calculate OEE

We can calculate OEE by two methods. One is very simple and less data is required. The other one requires more data, but for improving OEE we prefer second method since it has more data.

Lets move into detail…

OEE calculation – Method 1

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Following formula is used for calculating OEE in this method.

OEE = (Total no of good products produced × cycle time) / Planned production time

But in this method, we did’t get an idea of which three factors of OEE is lagging behind. Only after knowing this information, we can improve those factors.

But for quick calculation we can use this method.

OEE calculation – Method 2

Initially we need to calculate three factors, Availability, Performance and quality.

And finally OEE is calculated by multiplying these three OEE factors.

Lets look in to these factors, in detail…

Availability

Availability factor is the measure of how well a planned production time is used for producing products.

Availability is calculated by the following formula,

Availability = Run time / Planned production time

Run Time is obtained by reducing idle time from Planned production time.

           Run Time = Planned production time − Idle time

Idle time is the time for which machine is not running. This can be due to breakdown, material shortage, power failure, change over, etc.

Performance

Performance factor is a measure of how well a machine is able to maintain its cycle time for producing parts.

Performance factor is calculated by following formula,

Performance = (Cycle Time × Total products produced) / Run Time

Cycle time can be calculated by time study.

Quality factor

Quality factor measures how well a machine is able to produce good parts.

Quality factor is calculated by following formula,

Quality factor = No of good products produced / Total no of products produced

OEE calculation

OEE is calculated by multiplying the above three factors

OEE = Availability × Performance × Quality

If the equations for Availability, Performance, and Quality are substituted in the above and reduced to their simplest terms the result is:

OEE = (No of good products produced × Cycle Time) / Planned Production Time

OEE calculation Example

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Now let’s walk through a complete example using the method 2 of OEE calculation. Here is data recorded for the first shift:

Element Time
Duration of shift 480 minutes
Total break duration 2 nos 15 minute tea breaks and 30 minute lunch break
Downtime 55 minutes
Cycle Time 40.0 seconds
Total no of parts produced 490 products
Total no of parts rejected 40 products

Initially we need to calculate the following …

Planned production time

Formula for calculating planned production time is,

Duration of shift − Total break duration

480 minutes − 60 minutes = 420 minutes

Run time

The next step is to calculate the amount of time that production was actually running.

The formula is,

Run Time = Planned production time − Idle time

= 420 minutes − 55 minutes

= 365 minutes

No of good products produced

No of products produced =  Total products produced − Total rejected nos

= 490 products − 40 products

= 450 products

Availability

Availability = Run Time / Planned Production Time

= 365 minutes / 420 minutes

= 0.869 (86.90%)

Performance

Performance = (Cycle Time × Total products produced) / Run Time

= (40.0 seconds × 490 ) / (365 × 60 seconds)

= 0.895 (89.5%)

Quality factor

Quality factor = No of good products produced / Total no of products produced

= 450 / 490

= 0.9183 (91.83%)

OEE CALCULATION

Finally, OEE is calculated by multiplying the three OEE factors.

Availability × Performance × Quality

= 0.869 × 0.895 × 0.9183

= 0.7142 (71.42 %)

OEE can also be calculated using a simple method (method 1).

Formula is,

OEE = (Total no of good products produced × cycle time / Planned production time

= (450 products × 40.0 seconds) / (420 minutes × 60 seconds) = 0.7142 (71.42%)

The result is the same in both cases. The OEE for this shift is 71.42%.

Thanks for reading

I am thankful to Mr. Abin Antony for contributing to this article.

If you know any subject that can be related to manufacturing industry or industrial engineering, you can earn some income by becoming article contributor of this website. For knowing more about it, please visit Join us page.

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Mr. Abin Antony

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    The definition of waste in Lean Manufacturing perspective is “any activity that does not add value to the product or service” Something deep inside of almost every person tells us that it is good to improve. It is better to move forward than it is to move backward. It is better to move faster than slower. Personal contribution to a relentless pursuit of perfection is perhaps the most exhilarating thing that can happen to an individual, followed closely by being recognized for that contribution. The core idea behind Lean manufacturing is maximizing the customer value while minimizing waste, thereby achieving… Read more: Definition of waste in lean manufacturing perspective
  • AutoCAD Recovery Manager
    In today’s article we are going to talk about AutoCAD recovery manager. We all know about AutoCAD and how this software has changed our life drastically. If you want to learn more about AutoCAD you can check here. Autodesk’s AutoCAD is a household name nowadays, it is a tool which architects engineers, designer etc. use. It has numerous advantages but at the same time it has few drawbacks as well. Talking about the major drop back, it is the error or the crashes. Whenever we are working on a project in AutoCAD, sometimes due to power supply or due to… Read more: AutoCAD Recovery Manager
  • Operational excellence strategy
    Operational excellence strategy is a comprehensive approach that organizations employ to optimize their processes, enhance productivity, and consistently deliver high-quality products or services. Operational excellence is a multifaceted approach to improving business performance and productivity. It encompasses a wide range of principles, strategies, and practices aimed at optimizing operations, enhancing efficiency, and delivering exceptional value to customers. In this in-depth article, we will delve into the various strategies that organizations adopt for operational excellence and how they contribute to an organization’s success. Following are the operational excellence strategies; Let’s discuss each one in detail. Process Optimization Factovare One Month Free… Read more: Operational excellence strategy
  • 3D Printing in manufacturing
    Hey there! Have you heard about 3D printing? It’s this incredible technology that’s shaking up the world of manufacturing. Let me break it down for you. Imagine a world where you can create anything you want, from the most intricate designs to personalized medical implants, at the touch of a button. That’s the power of 3D printing, and it’s revolutionizing the world of manufacturing. 3D printing, or additive manufacturing, is changing the game, allowing us to build objects layer by layer, a stark contrast to the traditional subtractive manufacturing methods. This technology offers design flexibility, rapid prototyping, reduced waste, and… Read more: 3D Printing in manufacturing
  • Industrial wastewater treatment
    Industrial wastewater treatment is the process of purifying and removing contaminants from water that has been used in industrial processes. It aims to eliminate harmful substances, such as chemicals, heavy metals, and pollutants, from the wastewater before it is discharged into the environment or returned for reuse. This treatment is essential to protect ecosystems, public health, and comply with environmental regulations. In this article, we are going to focus on industrial wastewater and its treatment. What is Industrial waste water? Industrial wastewater refers to the contaminated water generated during various industrial activities, such as manufacturing, mining, and chemical production. It… Read more: Industrial wastewater treatment
  • Takt time excel template
    Takt time excel template is a format in Microsoft excel, which can be used to calculate takt time from the inputs entered in to it. Following are the three inputs needed for calculating takt time in the excel template; Here you will be able to download the takt time excel template, by clicking the download button. Download Excel Template For Knowing more about takt time, how is this calculated with example and it uses, refer our article on takt time. You can also try our web based takt time calculator from here. Don’t forget to consider your efficiency of your… Read more: Takt time excel template

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