Many treat OEE as one percentage, yet it is the product of three ratios: availability, performance and quality. That breakdown is the value: it shows whether the loss sits in time, in pace or in scrap.
The three components
- Availability: planned production time against actual run time. Every stop shows up here, planned or unexpected.
- Performance: nominal against actual cycle time. It falls when the machine runs slower than it should while still running.
- Quality: good units against all units produced. This is the only part production sees on its own.
Where most of the time is lost
The largest and least visible loss usually sits in performance: the machine runs, the shift looks happy, and the output still falls short of plan. That only shows up when you measure cycle time, not just piece count.
It is therefore worth reporting the three components separately, not only their product. An OEE of 62% on its own does not tell you whether maintenance or setup needs attention.