What Is Overall Equipment Effectiveness (OEE)?

How do manufacturers calculate OEE? 

When teams commit to improving OEE, they see a range of benefits: 
• More productivity and efficiency; reducing unnecessary downtime across the production line helps manufacturers achieve their ideal cycle times. This means more efficient use of resources and higher production rates.  
• Reduced maintenance costs; improvements to OEE drive down overall maintenance costs by minimizing scrap, rework, unplanned downtime, and other contributors to excess costs. 
• Improved equipment reliability and lifetime value; an emphasis on OEE entails more preventive and proactive maintenance to ensure maintenance teams address equipment issues promptly and keep them running effectively as long as possible. 
• Enhanced product quality; by reducing defects and encouraging consistency, OEE improvements make production processes more dependable and, ultimately, better satisfy customer expectations. 
• Data-driven decision making; all those performance data offer useful guidance for making decisions to carry out process improvements.

How can manufacturers achieve world-class OEE? 

You can find a system’s performance score by dividing its actual throughput by its maximum possible throughput. Performance losses occur when manufacturing processes are forced to run below their maximum speed. 

Raising your OEE scores starts with taking a more proactive approach to managing your assets and enhancing their performance. Check out this guide to evolving beyond reactive maintenance.

Calculating availability scores

((20,000 parts/400 minutes of run time)/60 parts per minute) x 100 = 83.3%

Here’s how overall equipment effectiveness, overall operations effectiveness, and total effective equipment performance relate to one another.  

How does OEE in manufacturing relate to maintenance? 

Here’s the quality formula, and yet another example: 

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Check out some of Limble’s case studies to learn about how implementing computerized maintenance management systems has helped customers maximize the bottom-line impact of their maintenance teams. 

Start the transition to preventive maintenance

Learn all about calculating OEE to assess manufacturing productivity in this video. 

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.5312 x 100 = 53.12% OEE

OEE scores are particularly important for lean manufacturers. In lean environments, all efforts are tailored toward eliminating sources of waste and fostering continuous improvements. It’s all about avoiding the six big losses. You’ll notice that these are tied to the qualities used to calculate OEE:
• Availability losses: Breakdowns (equipment failure, unplanned downtime, missing tools), setup, and adjustments (changeover, startup time)
• Performance losses: Reduced speed (operator errors or inefficiencies, slow cycles, incorrect settings) and small stops (jams, bottlenecks, obstructions, cleaning, inspection, idling)
• Quality losses: Startup rejects (rework, scrap, and production rejects) during production

OEE = performance x availability x quality

Determining OEE is a standard method for assessing the productivity of production lines compared to their potential. Organizations in manufacturing sectors, including pharmaceuticalsfood and beverage, and utilities, use OEE data to eliminate inefficiencies and drive continuous improvement.

Availability, performance, and quality

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Calculating quality scores

((500 minutes – 100 minutes)/500) x 100 = 80%

Organizations determine the overall equipment effectiveness of their systems and manufacturing processes by multiplying performance, availability, and quality. 

Take an OEE-driven approach to preventive maintenance. A more preventive, data-driven approach to asset management helps boost the factors that contribute to OEE. Introducing automation will enhance your abilities to spot signs of trouble early and keep machines in peak condition. 
• Trace issues to their source. Don’t just settle for collecting and storing data; make it the source of dependable business improvement. Diving into performance and failure data makes it possible to track issues to their source, conduct root cause analyses, and make a change. 
• Build a culture of continuous improvement. Your team should never settle for good enough. Remember that OEE scores provide useful guidelines for driving improvements and continually making the maintenance department everything it can be. 
• Leverage the right technology. Maintenance 4.0 demands far more advanced resources than spreadsheets alone. Edge computing and IoT (internet of things) devices with real-time data collection and monitoring capabilities make it easier to analyze the production data necessary for making improvements, benchmarking the performance of assets and systems, and tracking progress against KPIs.

Published: Wednesday, February 21, 2024 – 12:02

OEE measurements rely on three separate metrics. Manufacturers take this trio of OEE metrics into account to get a holistic look at the effectiveness of their processes and assets:  
1) Availability: How often does the asset or system function at a given time and under given conditions? 
2) Performance: How much does the asset or system produce? 
3) Quality: How many defect-free products does the asset or system create? 

OEE in lean manufacturing

Published Feb. 2, 2024, by Limble.

منبع: https://www.qualitydigest.com/inside/lean-article/what-overall-equipment-effectiveness-oee-022124.html

You’ll calculate availability by determining the ratio of actual run time to planned production run time for your system.