What is OEE?
OVERALL EQUIPMENT EFFECTIVENESS
OEE (Overall Equipment Effectiveness) is the gold standard for measuring manufacturing productivity. Simply put — it identifies the percentage of manufacturing time that is truly productive. An OEE score of 100% means you are manufacturing only Good Parts, as fast as possible, with no Stop Time. In the language of OEE that means 100% Quality (only Good Parts), 100% Performance (as fast as possible), and 100% Availability (no Stop Time).
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Availability = Actual Run Time / Planned Production Time
Performance = (Ideal Cycle Time x Total Pieces)/Operating Time
Ideal Cycle Time is the minimum cycle time that your process can be expected to achieve under optimal conditions, for a given part. Therefore, when it is multiplied by Total Pieces the result is Net Operating Time.
Performance should never be greater than 100%. If it is, that usually indicates that Ideal Cycle Time is set incorrectly (it is too high).
Quality = Good Pieces / Total Pieces
OEE = Availability x Performance x Quality
Why the Preferred OEE Calculation?
OEE scores provide a very valuable insight — an accurate picture of how effectively your manufacturing process is running. And, it makes it easy to track improvements in that process over time.
Example of calculating OEE.
Now let’s work through a complete example using the preferred OEE calculation. Here is data recorded for the first shift:
Planned Production Time: [Shift Length − Breaks]
480 minutes − 60 minutes = 420 minutes
Run Time: [Planned Production Time − Stop Time]
420 minutes − 47 minutes = 373 minutes
Good Count: [Total Count − Reject Count]
19,271 widgets − 423 widgets = 18,848 widgets
Availability: Run Time / Planned Production Time
373 minutes / 420 minutes = 0.8881 (88.81%)
Performance:(Ideal Cycle Time × Total Count) / Run Time
(1.0 seconds × 19,271 widgets) / (373 minutes × 60 seconds) = 0.8611 (86.11%)
Quality:[Good Count / Total Count]
18,848 widgets / 19,271 widgets = 0.9780 (97.80%)
Availability × Performance × Quality
0.8881 × 0.8611 × 0.9780 = 0.7479 (74.79%)
The OEE for this shift is 74.79%.
So by this real time calculation we can implement in the factory for real time OEE with shift wise.