OEE is a mirror, not a metric
Most plants that measure OEE measure it wrong — and the ones that measure it right often can't look at it honestly.
Overall Equipment Effectiveness is the most abused number in manufacturing. Plants quote 85% while running at 55%. The gap isn't dishonesty — it's definition. Exclude planned downtime, ignore minor stoppages, round up speed losses, and any machine looks world-class.
Honest OEE hurts. It says the machine you bought for eight hours of value delivers four and a half. It says your changeover standard is fiction. It says the night shift runs twelve points below the day shift and has for two years.
But honest OEE is also the cheapest capacity you will ever buy. Moving a bottleneck machine from 55% to 70% OEE is equivalent to buying 27% more machine — for the cost of discipline rather than capex. In our experience, most Indian mid-size plants hold 20–30% hidden capacity behind their OEE number.
Start with one machine. The bottleneck. Measure it honestly for two weeks — every stop, every slow cycle, every defect. Don't fix anything yet; just look. The improvement agenda writes itself, and it will be nothing like what the monthly review meeting assumed.
Performance Journal
Written by the RELY360 architects — from live engagements across Indian manufacturing.
The Question