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The next step is to calculate the amount of time that production was actually running (was not stopped). So first, exclude any Shift Time where there is no intention of running production (typically Breaks).Įxample: 480 minutes − 60 minutes = 420 minutes Run Time Look at the following OEE data for two sequential weeks.Īs described in the OEE Factors page, the OEE calculation begins with Planned Production Time. A single number that captures how well you are doing (OEE) and three numbers that capture the fundamental nature of your losses (Availability, Performance, and Quality). In the preferred calculation you get the best of both worlds. This is the role of Availability, Performance, and Quality. What your OEE score doesn’t provide is any insights as to the underlying causes of lost productivity.
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And, it makes it easy to track improvements in that process over time. OEE scores provide a very valuable insight – an accurate picture of how effectively your manufacturing process is running. And, as described earlier, multiplying Good Count by Ideal Cycle Time results in Fully Productive Time (manufacturing only Good Parts, as fast as possible, with no Stop Time). This is the “simplest” OEE calculation described earlier. OEE = (Good Count × Ideal Cycle Time) / Planned Production Time If the equations for Availability, Performance, and Quality are substituted in the above and reduced to their simplest terms the result is: OEE = Availability × Performance × Quality OEE takes into account all losses, resulting in a measure of truly productive manufacturing time. This is the same as taking the ratio of Fully Productive Time (only Good Parts manufactured as fast as possible with no Stop Time) to Net Run Time (all parts manufactured as fast as possible with no stop time). Remember, OEE Quality is similar to First Pass Yield, in that it defines Good Parts as parts that successfully pass through the manufacturing process the first time without needing any rework. Quality takes into account manufactured parts that do not meet quality standards, including parts that need rework. If it is, that usually indicates that Ideal Cycle Time is set incorrectly (it is too high). Performance should never be greater than 100%. Performance = (Total Count / Run Time) / Ideal Run Rate Since rate is the reciprocal of time, Performance can also be calculated as: Therefore, when it is multiplied by Total Count the result is Net Run Time (the fastest possible time to manufacture the parts). Ideal Cycle Time is the fastest cycle time that your process can achieve in optimal circumstances.
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Performance = (Ideal Cycle Time × Total Count) / Run Time Performance is the ratio of Net Run Time to Run Time. Performance takes into account anything that causes the manufacturing process to run at less than the maximum possible speed when it is running (including both Slow Cycles and Small Stops). Run Time = Planned Production Time − Stop Time Performance Run Time is simply Planned Production Time less Stop Time, where Stop Time is defined as all time where the manufacturing process was intended to be running but was not due to Unplanned Stops (e.g., Breakdowns) or Planned Stops (e.g., Changeovers). AvailabilityĪvailability takes into account all events that stop planned production long enough where it makes sense to track a reason for being down (typically several minutes).Īvailability is calculated as the ratio of Run Time to Planned Production Time:Īvailability = Run Time / Planned Production Time OEE is calculated by multiplying the three OEE factors: Availability, Performance, and Quality.