How to calculate OEE

Summary

This video explains how to calculate Overall Equipment Effectiveness (OEE) by breaking down its three main components: availability, performance, and quality. It illustrates the calculation process step-by-step, starting from the total time available and accounting for planned and unplanned downtime to determine machine runtime. The performance factor is analyzed based on the standard production rate compared to actual output, while quality assesses the proportion of good products versus scrap. By multiplying these factors, viewers learn how to derive an OEE percentage, providing valuable insights into manufacturing efficiency and opportunities for improvement.

Takeaways

• 😀 OEE (Overall Equipment Effectiveness) is calculated using three key factors: availability, performance, and quality.
• 📊 Availability measures the percentage of time equipment is available for production, excluding planned downtime.
• ⏳ To calculate availability, subtract planned and unplanned downtime from total time to determine available runtime.
• 🚀 Performance assesses how well the manufacturing process runs compared to its maximum speed.
• 🧮 The performance ratio is derived from the standard time produced compared to the runtime of the machine.
• 👌 Quality measures the proportion of good parts produced, calculated by subtracting scrap from total output.
• 🔍 The quality ratio is the standard time earned (for good products) divided by the standard time produced.
• 📉 The final OEE percentage is found by multiplying availability, performance, and quality together.
• 🛠️ An alternative way to calculate OEE is using the ratio of standard time earned to available time.
• 📈 Visualizing the factors affecting OEE helps identify production losses and drive improvements in manufacturing.

Q & A

What is Overall Equipment Effectiveness (OEE)?

OEE is a metric used to assess how effectively a manufacturing operation is utilized compared to its full potential. It considers availability, performance, and quality.

How is availability defined in the context of OEE?

Availability measures the percentage of time that equipment is available for production, excluding planned downtime.

What steps are involved in calculating availability?

To calculate availability, subtract planned downtime from total time to get available time, then subtract unplanned downtime to find runtime. Finally, divide runtime by available time.

What is the significance of the performance factor in OEE?

Performance accounts for any factors that cause the manufacturing process to run slower than its maximum possible speed, impacting overall production efficiency.

How is performance calculated in the OEE framework?

Performance is calculated by dividing the standard time produced by the runtime of the machine.

What does the quality factor represent in the OEE calculation?

Quality measures the proportion of good products produced during the production time compared to the total production output.

How can you calculate the quality factor in OEE?

Quality is calculated by dividing the standard time earned (time for good products) by the standard time produced (total production time).

What is the overall OEE percentage calculated from the three factors?

The overall OEE percentage is calculated by multiplying the availability, performance, and quality factors together.

What alternative equation can be used to calculate OEE?

OEE can also be calculated by the ratio of standard time earned to available time, which simplifies the calculation process.

Why is it important to visualize the factors affecting OEE?

Visualizing the factors allows manufacturers to identify specific areas of loss in production time, enabling targeted improvements to enhance overall efficiency.