Thursday 20 December 2018

How to calculate OEE (Overall Equipment Effectiveness)

OEE is a "measuring tool" to find out how closely your production process with the perfect process. The perfect process is a process that only produces good output, in the shortest possible time, without any down time. OEE is an excellent matrix to gain a benchmark for improving manufacturing productivity.

Overall Equipment Effectiveness or commonly known by the abbreviation OEE is a matrix. That identifies the percentage of productive time of the total time use. To complete the production activity. The value of OEE that reaches 100% means that production runs perfectly and maximum productivity. That is, the production line produces only 100% good products. In a very fast according to allocation, without any down time.

How to Calculate OEE

The OEE score or score is calculate by considering three factors, namely:

  1. Availability:

    actual production time, compared to planned production time. If the value of Availability 100%, meaning that the process always runs in a time corresponding. To the plan production time (there is never down time).

  2. Performance:

    meaning process performance, whether able to maximize production acceleration. If the Performance value is 100%, then the process has been running at maximum speed. Theoretically, based on Ideal Cycle Time and Total Pieces.

  3. Quality:

    relates to defects and scraps. 100% Value for Quality means production does not produce defective products at all.

Each of these factors represents a different perspective on how closely your manufacturing process is in perfect state.

Perform a Manual Calculation First

By doing the calculations manually, you will get a better understanding of OEE. This calculation is relatively easy to do. You only need to have three types of data. The formula is:

OEE = (GOOD PIECES X IDEAL CYCLE TIME) / PLANNED PRODUCTION TIME With the addition of two data, Run Time and Total Pieces, you can also calculate Availability, Performance and Quality. The formula is:




When you have an understanding of OEE, you will have significant benefits related to data collection automation. The automate system will provide more accurate down time data. More detail information on performance loss, real time and historical matrices , and richer reports.

Focus on Loss ( Loss )

Calculating OEE is the beginning of the OEE program, as well as its foundation. The strengths and advantages of the real OEE come from the understanding and action of the major losses. Namely Availability Loss, Performance Loss, and Quality Loss.

  1. Availability Loss: includes everything that stops scheduled production. Which takes up considerable time (usually a few minutes). For example, the machine is jam, maintenance is complete out of schedule, lack of material, and changeover.

  2. Performance Loss: includes all factors that cause the process to run more slowly. Than its maximum speed (including slow cycles and small stops ). For example, machine use interruptions, materials that do not meet the quality standards, and installation errors.

  3. Quality Loss: including reduce productivity from one part of manufacturing. That does not meet quality standards after a first pass (as in the first pass yield concept ). For example scrap and parts that require rework .

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