Overall Equipment Effectiveness (OEE)
OEE is a standard metric for measuring manufacturing productivity. It identifies the percentage of manufacturing time that is truly productive (100% OEE means perfect production).
Where:
- Availability = Run Time / Planned Production Time
- Performance = (Total Parts × Ideal Cycle Time) / Run Time
- Quality = Good Parts / Total Parts
Results
Overall Equipment Effectiveness:
Availability
Run Time: minutes
Performance
Theoretical Production: parts
Quality
Rejection Rate:
Loss Analysis
| Loss Category | Time Lost (minutes) | Percentage |
|---|---|---|
| Availability Loss (Downtime) | ||
| Performance Loss (Speed) | ||
| Quality Loss (Defects) | ||
| Total Productive Time |
Practical Examples
Example 1: World-Class Performance
Planned Time: 480 min | Downtime: 24 min | Ideal Cycle Time: 45 sec | Total Parts: 580 | Good Parts: 576
Availability: 95% | Performance: 93.75% | Quality: 99.3% | OEE: 88.5%
Example 2: Average Performance
Planned Time: 480 min | Downtime: 120 min | Ideal Cycle Time: 45 sec | Total Parts: 450 | Good Parts: 432
Availability: 75% | Performance: 84.4% | Quality: 96% | OEE: 60.8%
Example 3: Poor Performance
Planned Time: 480 min | Downtime: 240 min | Ideal Cycle Time: 45 sec | Total Parts: 300 | Good Parts: 270
Availability: 50% | Performance: 62.5% | Quality: 90% | OEE: 28.1%
OEE Benchmarking
| OEE Level | Percentage | Description |
|---|---|---|
| World Class | 85%+ | Considered best-in-class performance |
| Excellent | 75-84% | Strong performance with minor opportunities |
| Average | 65-74% | Typical for many manufacturers |
| Below Average | 55-64% | Significant room for improvement |
| Poor | <55% | Urgent need for improvement |