Understanding OEE
OEE
Understanding OEE
Overall Equipment Effectiveness
Metrics that go into the OEE formula
- Availability
- Performance
- Quality
OEE
OEE = Availability% x Performance% x Quality%
if:
- Availability = 91% (0.91)
- Performance = 98% (0.98)
- Quality = 99% (0.99)
then the OEE = 88% (0.88):
88% = 91% x 98% x 99% (0.91 x 0.98 x 0.99)
OEE is only calculated on available time.
Available time
In FactoryWiz, available time is time covered by a shift and when the machine was either in production or setup mode. So if you have 2 shifts 06:00-14:00 and 14:00-22:00 then you have 16 hours a day as available time.
The Availability metric
Availability = Running time / Available time.
So if a machine runs for 10 hours in a day, then the Availability is 62.5%:
10 / 16 = 0.625
The Performance metric
Performance = Average Planned runtime / Average Actual Runtime
If a machine was averaging 120 seconds or running per cycle but it should take 108 seconds, then the performance is 90%
108 / 120 = 0.9
Running time is NOT cycle time (cycle time includes idle and paused time).
What is the Quality metric?
Quality = Good parts / Total parts
If a machine makes 500 parts and rejects 30 parts then the Quality is 94%
470 / 500 = 0.94
Related Articles
OEE Calculation Explained
One of the most common questions is how OEE (overall equipment effectiveness) is calculated. This article is intended to explain what that means in the context of FactoryWiz. First off - OEE is calculated out of your scheduled time only. If you have ...8.7.10 OEE Calculation
Overall Equipment Effectiveness (OEE) measures the percentage of manufacturing time that is productive. It combines measurements of availability, performance, and quality: · Availability: the percentage of the scheduled time during which the machine ...8.10.6 Machine Modes Excluded From OEE
On the Machine Modes Excluded From OEE page, you can view a list of current machine modes excluded from OEE, add new, edit, and delete machine modes excluded from OEE. You may select from a list of machine modes that have already been entered by the ...8.10.7 Machine Modes Always Idle For OEE
On the Machine Modes Always Idle For OEE page, you can view a list of current machine modes always idle for OEE, add new, edit, and delete machine modes always idle for OEE. You may select from a list of machine modes that have already been entered ...12.2.8 List View
Overview The List View shows each machine configured in FactoryWiz including its name, state, operator, part count, and OEE. Configuration Machines can be filtered by their Site, Department, and Group.