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Overall Equipment Effectiveness Analysis
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How OEE is calculated
| Availability | Description | Formula / Details |
|---|---|---|
| Availability | Total scheduled time (minutes) | A2 — Sum of all shift times. Example: 3 shifts × 8 hours = 24 hrs/day. |
| Availability | Total scheduled non-working time (minutes) | A3 — Lunch break, tea break, warming-up, daily PM, etc. |
| Availability | Available time | A1 = A2 − A3 |
| Availability | Machine downtime (minutes) | B — Downtimes like setup change, breakdown, power issues, no raw material, inspection, etc. |
| Availability | Availability % | A % = (100 × (A1 − B)) / A1 |
| Performance | Description | Formula / Details |
| Performance | Standard cycle time (seconds) | S — Time from cycle start to end for one part. |
| Performance | Standard unload + load time (seconds) | U — Idle time between two cycles. |
| Performance | Produced quantity | P1 — Number of parts produced. |
| Performance | Planned quantity | P2 = (A1 − B) / (S + U) — Parts theoretically possible in available running time. |
| Performance | Performance % | P % = 100 × (P1 / P2) |
| Quality | Description | Formula / Details |
| Quality | Rejected quantity | R — Number of parts rejected (exclude reworked parts). |
| Quality | Quality % | Q % = 100 × (R / P1) |
| OEE | Description | Formula |
| OEE | Overall OEE | OEE % = (A × P × Q) / 1,000,000 |
OEE losses and their meaning
| Type of loss | Meaning | Examples |
|---|---|---|
|
Not scheduled for production |
Time when the machine is not planned to run |
Non-working shifts, holidays, lunch breaks, tea breaks |
|
Failure, Idle time |
Time when the machine is planned to run, but is not running. This includes all events that stop production long enough where it makes sense to track a reason for the downtime (typically several minutes). |
Setup, machine breakdown, inspection, accident, no raw material, power shutdown, part unloading and loading. |
|
Failure, Idle time |
Machine running at lower than normal production rate, and downtimes of duration so small that it does not make sense to track the reason for the downtime |
Part unload/load time that is longer than the standard unload/load time, cycle times that are longer than the standard cycle time, rework |
|
Scrap |
Number of rejected parts. |
Rejection quantity |
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