Overall Equipment Effectiveness or OEE Is: Definition, Benefits, and objectives
Overall Equipment Effectiveness or OEE is one of the terms initiated by Seiichi Nakajima in 1960 to measure the effectiveness of the production process. Because this is based on the thought of being launched by Harrington Emerson regarding work efficiency.
So, what is the real understanding of the Overall Equipment Effectiveness or OEE? Find the answer by reading this article until it’s finished.
Understanding Overall Equipment Effectiveness / OEE is
Understanding of Overall Equipment Effectiveness or OEE is a calculation carried out to determine the value of the effectiveness of machines or equipment available. Oee is one of the methods available in the TPM or Total Productive Maintenance. As a rule, the OEE can be used as a machine performance indicator or system.
Some experts have some of their own opinions, Nakajima explained that OEE is a method used to assess the effectiveness of use on systems or machines using various perspectives in a calculation process.
While Davis explained that OEE is an overall efficiency of the structure produced from the value of calculation of availability, performance efficiency and the level of product of a product.
While Rizkia argues that OEE is a measure of effectiveness value on the use of machines or equipment by calculating the availability of machines, performance and also the quality of the products produced.
Benefits of Overall Equipment Effectiveness / OEE is
Muqsih explains that OEE is something that can be used as a performance indicator requires a certain period of time, such as Shift, Daily, Weekly, Monthly and Annual. This measurement will be the most effective if used in a manufacturing company. Oee can be used at various levels in the company environment, including:
- OEE is a thing that can be used as a reference point to measure the company’s performance plan.
- OEE is a form of estimated production flow that can be used to compare performance pathways on the company’s cross departments, so that there will be an insignificant flow.
- If this manufacturing process will be carried out individually, OEE is a thing that can determine which machine or tool that provides poor performance and determines to be more focused on TPM resources.
In general, some of the OEE benefits are as follows:
- Able to determine the starting point of the company, equipment or machine company
- Able to identify congestion on the company’s device or machine
- Able to identify all productivity losses
Overall Equipment Effectiveness / OEE purpose is
While the main purpose of OEE is to be able to assess the performance of maintenance systems. You can use this method to be able to check availability on the machine or system, production efficiency, and also the quality of the production of machinery or company systems.
Measurement and calculation of overall equipment effectiveness / OEE is
As we already know, OEE is a calculation used to be able to determine the level of productivity and effectiveness of the equipment. The OEE formula is as follows:
OEE (%) = Availability (%) X Performance Efficiency (%) X Rate of Quality Product (%)
Based on a award given by the Japan Institute of Plant Maintenance company, the ideal condition of OEE is as follows:
- Availability> 90%
- Power efficiency> 95%
- Product quality> 99%
- His idea, the OEE value is: 0.90 x 0.95 x 0.99 = 85%
3 Elements of Overall Equipment Effectiveness OEE Is
There are three elements of productivity and also the effectiveness of the equipment that can be measured, which are availability, performance efficiency and rate of quality product. Let’s discuss one by one below.
Availability is a ratio between the useful life of the engine company and the benefits that are desired in the time available. Availability this is a measure of how far the machine can keep operating.
The ratio of the availability of these is the level of effectiveness of the operation of the machine or system of a company. The availability ratio is about the comparison between the operation time and the time of preparation. Parameters such is able to determine the readiness of the tools available and able to be used properly.
While the availability of low tend to occur due to the maintenance of the poor. For that, the calculation of the value of the availability requires time operation, charging time and downtime.
To calculate the availability of the can using the following formula.
Availability = Loading time – downtime : loading time x 100%
Availability = Operation time : loading time x 100%
Operation time is the result from the reduction of the charging time when the machine can not work. Machine Downtime is the time required to process what that should be used by the machine but because of the failure function of the machine, then it is not able to generate power generation.
Machine downtime is included on the cessation of the machine because damage to the machine or equipment, w mould, perform the procedure of installation, adjustment, etc.
While the loading time is the time available per day or month which reduced the downtime of the machine that are already planned.
2. Performance Efficiency
Performance Efficiency is a relationship between what actually must be within a certain period of time or could be described as a comparison between the level of actual production and that is to be expected.
Nakajima explained that the efficiency of the performance could be resulting from multiplying a speed of working and operating activities net or the ratio between the number of products successfully produced and then multiplied by the cycle time ideal and the time available to perform a variety of process production.
The formula for calculating the efficiency of performance is as follows.
Operation speed rate = ideal cycle time actual cycle time
Net operation rate = Processed amount x actual cycle time : operation time
Performance efficiency = Processed amount x actual cycle time : operation time x ideal cycle time actual cycle time
Performance efficiency = Processed amount x ideal cycle time : operation time x 100%
Speed is the ratio of the chance of engine choice which is based on the actual engine on engine speed actual. Runtime net is used to calculate the losses caused by the little bit of downtime and also a decrease in the speed of production.
3. Rate of Quality Product
Nakajima explained that the Rate of Quality Product is a ratio between the number of products that are better and also the total amount of product processed. Levels of quality this product is able to show products that can be accepted by the whole of the products produced.
Examples Of Questions
In a production process, a machine requires time to set up which takes 10 minutes/shift. While the total working hours in 1 shift is 8 hours or 480 minutes, while the downtime that occurs due to engine problems takes 20 minutes, then what is the value of availability on the machine?
Loading time = total time available – loss time = 480 minutes (10 minutes + 20 minutes) = 450 minutes
Availability = (loading time / total time available) x 100 % = (450 minutes / 480 minutes) x 100% = 93 %
In a production process, a machine is able to make the products as much as 400 pcs/shift. Working hours in time the shit is 8 hours or 480 minutes, while the total time required to make 1 pcs of products is one minute per pcs. Then, berapakan the value of the performance of such a machine?
Performance = (the amount of product produced / total time available x cycle time) x 100 % = (400 pcs / 480 min x 1 min) x 100% = 83%
In a production process, a machine able to produce as much as 500 pcs/shift with the amount of defective products as much as 10 pcs/shift. Then, berapakan the value of the quality of the machine?
The amount of good product = total output – the number of defects = 500 pcs– 10 pcs = 490 pcs Quality = (number of products / total product produced) x 100 % = (490 pcs / 500 pcs) x 100% = 98%
Thus the explanation from us about the OEE or overall equipment effectiveness. So, OEE is a calculation that is done in order to determine the effectiveness of a machine or equipment that is available. The calculation can be done with a variety of formulas that we already described above.
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