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OEE Implementation Guide
for Tennessee Manufacturers
What OEE measures, how to calculate it, where to start, and how to use it to drive real improvement on the shop floor.
A Solutions Consultant will send it to you directly.
Why OEE Matters
Most manufacturers know they have equipment losses. Machines go down, lines run slower than they should, and scrap happens. The problem is not awareness — it is measurement. Without a structured way to quantify these losses, improvement efforts are based on gut feel rather than data.
OEE gives you a single number that captures three critical dimensions of equipment performance. OEE is not just a maintenance metric — it connects equipment performance to output, delivery, cost, and customer satisfaction.
Availability
Is the machine running when scheduled?
Breakdowns, changeovers, material shortages, unplanned stops
Performance
Is it running at full speed?
Slow cycles, minor stops, speed losses, operator hesitation
Quality
Is it making good parts?
Scrap, rework, startup rejects, out-of-spec product
How to Calculate OEE
OEE is the product of three percentages, each calculated independently then multiplied together.
OEE = Availability × Performance × Quality
Availability = Run Time ÷ Planned Production Time
Example: 480 min shift − 30 min breaks = 450 min planned. Machine down 60 min. Run Time = 390 min. Availability = 390 ÷ 450 = 86.7%
Performance = (Ideal Cycle Time × Total Pieces) ÷ Run Time
Example: Ideal = 2 pieces/min. 390 min produced 700 pieces (ideal = 780). Performance = 700 ÷ 780 = 89.7%
Quality = Good Pieces ÷ Total Pieces
Example: 700 pieces, 21 defective. Good = 679. Quality = 679 ÷ 700 = 97.0%
Final OEE = 86.7% × 89.7% × 97.0% = 75.4%
This manufacturer is losing nearly 25% of productive capacity — and the calculation shows exactly where it comes from.
OEE Benchmarks
The most important comparison is always your own trend over time.
85%+
World Class
Mature TPM, standardized work, sustained discipline
65–85%
Good
Solid foundation with room for targeted improvement
45–65%
Typical
Common starting point — significant improvement opportunity
<45%
Low
More than half of productive capacity being lost
Don't chase a number. OEE is a tool for finding losses — not a scorecard to game.
The Six Big Losses
Understanding which losses are hurting you most tells you which lean tools to deploy first.
| Loss | Description | Tool |
|---|---|---|
| Availability Losses | ||
| Breakdowns | Unplanned equipment failures | TPM |
| Changeover | Time switching between products | SMED |
| Performance Losses | ||
| Minor Stops | Short stops under 5 minutes | 5S, Std Work |
| Slow Cycles | Running below designed speed | TPM, Std Work |
| Quality Losses | ||
| Startup Rejects | Defects after changeover warmup | SMED, Poka-Yoke |
| Production Rejects | Defects during normal production | Poka-Yoke, Std Work |
How to Start Tracking OEE
You do not need software, sensors, or a six-month project. Start simple, on paper, on one machine.
1
Pick one machine
Choose a bottleneck or a line everyone knows is underperforming. One machine, one shift, one week.
2
Define your terms
Agree on planned production time, ideal cycle time, what counts as a good part, and what counts as downtime. Write it down.
3
Collect data for one shift
Use a paper log at the machine. Record all downtime events with reason and duration, total pieces, and defective pieces.
4
Calculate and review
Calculate Availability, Performance, and Quality daily for one week. Review with the team: where are we losing the most?
5
Act on what you find
Availability losses → TPM and SMED. Performance losses → standardized work. Quality losses → mistake proofing.
Common OEE Mistakes
OEE is simple to calculate but easy to get wrong.
Inflating ideal cycle time
Using your average speed instead of your best sustainable speed hides performance losses. Use the machine's rated or best observed speed.
Hiding planned stops
Reclassifying unplanned downtime as planned stops inflates Availability. If a changeover took 45 minutes but should take 15, those 30 extra minutes are a loss.
Not tracking minor stops
Twenty 2-minute stops per shift equals 40 minutes of lost production. Minor stops go unrecorded but add up fast.
Making OEE punitive
If operators feel punished for low OEE, they stop reporting accurately. The question is always: what is preventing this machine from running at its best?
Measuring everything at once
Starting OEE on every machine across three shifts overwhelms the team. Start with one machine. Prove the value. Then expand.
Never acting on the data
Tracking OEE without making improvements is just extra paperwork. Every week, identify your biggest loss and decide what you're going to do about it.
Free Resource
OEE Tracking Sheet
A ready-to-print daily data collection sheet designed for use at the machine — plus guidance on setting up OEE tracking in your facility.
- ✓ Daily shift log template
- ✓ Downtime reason codes
- ✓ OEE calculation worksheet
- ✓ Weekly trend chart
A Solutions Consultant will send it to you directly
Need Help Setting Up OEE Tracking?
Tennessee MEP consultants help manufacturers set up OEE tracking and implement the lean tools that improve it. No commitment. No cost to start.