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What is OEE?

Overall Equipment Effectiveness (OEE) is a key performance indicator (KPI) used in manufacturing to measure how efficiently equipment is utilized. It shows how close a production process is to its full potential and helps identify losses caused by downtime, reduced speed, and quality issues.

 

What does OEE measure?

OEE evaluates production efficiency based on three factors:

  1. Availability

  2. Performance

  3. Quality

These three elements combined provide a clear and standardized view of equipment effectiveness.

 

1. Availability

Availability measures how much of the scheduled production time the equipment is actually running.

It accounts for downtime such as:

  • Breakdowns

  • Changeovers

  • Adjustments

  • Unplanned stops

Availability1

Operating Time: Planned Production Time - Downtime events (e.g., breakdowns, adjustments, changeovers).
Planned Production Time: Total time scheduled for production.

If downtime increases, Availability decreases.

 

2. Performance

Performance measures whether the machine runs at its expected speed.

It considers:

  • Minor stops

  • Reduced operating speed

  • Running below maximum capacity

Key terms:

  • Ideal Cycle Time – The theoretical minimum time to produce one unit

  • Total Count – All units produced during operating time

If the machine runs slower than its ideal speed, Performance decreases.

preformance1

 

3. Quality

Quality measures how many produced units meet the required standards.

It accounts for:

  • Defects

  • Rework

  • Scrap

Key terms:

  • Good Count – Units that meet quality standards

  • Total Count – All units produced (including defects)

If defect rates increase, Quality decreases.

 

Quality

 

OEE Calculation

After calculating Availability, Performance, and Quality (as decimals), OEE is calculated as:

OEE

 

How to interpret OEE results

  • 100% OEE
    Perfect production: no downtime, maximum speed, zero defects

  • 85% OEE
    Considered world-class manufacturing performance

  • 60% OEE
    Common in many factories, with clear improvement potential

  • Below 40% OEE
    Indicates significant inefficiencies requiring immediate attention

 

OEE in the system

Maintmaster OEE uses the OEE calculation to provide clear insights into how your machines are performing. By visualizing Availability, Performance, and Quality losses, the system helps you:

  • Identify bottlenecks

  • Reduce downtime

  • Improve speed stability

  • Minimize quality losses

  • Optimize overall production efficiency

OEE provides a structured and data-driven foundation for continuous improvement.