OEE – definition and calculation
Overall equipment effectiveness
OEE determines performance during planned production times and downtime because of unplanned failures. This means that before the calculation, factors such as maintenance, breaks, public holidays, and weekends or vacations are taken into account. Production stoppages are only determined for planned production times. This KPI is thus primarily suitable for recognizing and initiating a possible improvement of the output.
Total effective equipment performance
TEEP, on the other hand, determines the maximum performance with current effectiveness, i.e., it assumes that a system is in operation 24 hours a day. This measurement is useful for identifying whether additional production times would allow production to increase or whether another system will be needed.
The utilization compares the currently planned production time with the total available time. It is not part of the classic OEE metric, but is included in the TEEP metric (Total Effective Equipment Performance).
Availability is reduced by unplanned downtime during production. Missing material, broken parts of the system or faults reduce the output of the production facilities. These losses are known as availability losses and are further subdivided into breakdowns, setups, and conversions. The available production time is compared to the downtime.
The performance is defined as the number of parts produced compared to the target quantity. If as many parts were produced in a certain period of time as were planned, the performance is 100%.
The quality score represents the ratio of all parts produced as compared to the number of parts produced without errors. So, if there are no faulty parts among all parts that are produced, the quality is 100%.
Save expensive investments
Expensive investments for additional machines can be saved by uncovering spare capacity!
By automatically recording the OEE KPI, deviations are detected immediately and any potential for improvement identified. The reduced response time has a positive effect on the effectiveness of your system!