OOE- Overall Operations Effectiveness – MachineMetrics

Topics covered in this article:

What is OOE?

OOE, or, Overall Operations Effectiveness is a measurement similar to OEE that measures the overall performance of a machine and is calculated in much the same way. The difference between OOE and OEE is the way Availability is defined.

OEE defines availability as how much time a machine is running vs the entire amount of time it was scheduled to be running, therefore considering total scheduled time as the maximum availability.

OOE considers the amount of time a machine is running vs the total scheduled shift time, including scheduled and non-scheduled time, therefore considering total operations time as the maximum availability.

In short, where OEE takes into account just the time when jobs are scheduled to run, OOE factors in the entirety of the scheduled shift. OOE measures the efficiency of operations from the beginning to the end of a shift, regardless of if the time was scheduled to run a job or not.

Why OOE?

OOE is a slight variation on OEE as it takes unscheduled time into account, unlike OEE which includes the total time your machines are scheduled to run a job (OEE).

For more information about OEE please visit our Knowledge Base article here.

Three Components of OOE

Availability

For OOE, availability includes total scheduled and unscheduled time, making the total operations time the maximum availability. A machine is considered to be running when the execution state of the machine is active, and what determines active varies by machine and control.

For example: If a shift is eight hours, and the machine is active for four of those eight hours, the Availability for that machine will be 50% when calculating OOE, regardless of how much of that time was scheduled to run a job.

OOE Availability= OEEavailability * (scheduledTime /  nonOptionalTime )

Performance

Performance is a measure of the difference between the Ideal Cycle Time and the Actual Cycle Time.

For example: If each part produced has an Ideal Cycle Time of 2 minutes, and the machine's Actual Cycle Time for each part is 2 minutes, the performance of the machine will be 100%.

Quality

Quality refers to good parts vs bad parts, or how many total parts were produced and how many of those parts were considered good parts.

For example: If a machine is running a scheduled job and produces 200 parts, 150 good parts, and 50 parts were rejected, the Quality will be 75%.

Calculating OOE

As outlined above, each of these three components produces a percentage. The percentages are then multiplied, and the product becomes the OOE for that machine.

OOE Calculation:

OOE = OEE * (scheduledTime / allnonOptionalTime)

vs OEE Calculation :

OEE = availability * Performance * Quality (where Availability = scheduledTimeInCycle / ScheduledTime)

Definitions

allTime - The queried range of time.
nonOptionalTime - The amount of time over the queried range of time covered by shifts that are not considered optional (an example of an optional shift would be an overnight 'AP off' that is not normally staffed)
scheduledTime - The amount of time that a machine has been scheduled to operate over the queried range of time.
scheduledTimeInCycle - The amount of time a machine has been in cycle (executing) during its scheduled times.
scheduledTotalParts - The amount of parts produced during a machine's scheduled times, excluding periods of planned setup.
idealPartTime - Sometimes referred to as idealCycleTime, the theoretical shortest amount of time that a machine should be able to complete a part.
totalParts - The total number of parts produced over the queried range of time.
goodParts - The amount of totalParts that represent good parts.

Have Questions?

If you have additional questions about OEE please reach out to support@machinemetrics.com.