Lean Metrics That Matter | Lights Out Machine: OEE, FPY & MTTR in Automated Systems
In lean manufacturing, what gets measured gets improved. But not all metrics are created equal. To truly drive performance, manufacturers need to focus on the KPIs that reflect real-world efficiency, quality, and responsiveness with lights out machine.
At Position Automation, we help manufacturers track and improve three of the most powerful lean metrics: OEE (Overall Equipment Effectiveness), FPY (First Pass Yield), and MTTR (Mean Time to Repair). These aren’t just numbers; they’re the pulse of your production line, and our lights out machine solutions are designed to optimise them.
What Is OEE?
OEE (Overall Equipment Effectiveness) is a comprehensive metric that measures how effectively a manufacturing asset is utilised. It combines three key factors:
- Availability: How often the machine is running when it should be
- Performance: How fast the machine runs compared to its maximum speed
- Quality: How many good parts are produced without rework or scrap
Formula:
OEE = Availability * Performance * Quality
Why It Matters:
OEE gives you a single percentage that reflects the true productivity of your equipment. A world-class OEE score is around 85%. Anything below 60% signals major room for improvement.
What Is FPY?
FPY (First Pass Yield) measures the percentage of products that pass through a process without needing rework or repair.
Formula:
FPY = (Good Units Produced / Total Units Produced) * 100
Why It Matters:
High FPY means fewer defects, less rework, and lower costs. It’s a direct indicator of process quality and stability. In lean terms, it reflects your ability to “build it right the first time.”
What Is MTTR?
MTTR (Mean Time to Repair) is the average time it takes to diagnose and fix a machine after a failure.
Formula:
MTTR = Total Downtime / Number of Repairs
Why It Matters:
A low MTTR means your team can respond quickly to issues, minimising downtime and keeping flow intact. It’s a key part of Total Productive Maintenance (TPM) and lean reliability.
How Position Automation Helps You Improve These Metrics
Our lights out machine systems are engineered with these metrics in mind, not just to measure them, but to improve them.
Boosting OEE:
- High Availability: Robust engineering and lights-out capability reduce unplanned downtime
- High Performance: CNC precision and optimised cycle times ensure machines run at peak speed
- High Quality: Built-in Poka-Yoke, sensors, and repeatable automation reduce defects and rework
Improving FPY:
- Error-Proofing: Sensors verify part orientation, dimensions, and clamping before processing
- Consistent Quality: Automated processes eliminate variability and human error
- Real-Time Feedback: Operators are alerted to issues before they become defects
Reducing MTTR:
- Modular Design: Quick access to components for faster maintenance
- Diagnostic Alerts: Machines provide clear fault codes and root cause indicators
- Remote Support: Our team can assist with troubleshooting and updates without delay
Real-World Example: Metrics in Motion
A manufacturer using our automated profile cutting system was struggling with inconsistent performance:
- OEE was below 55% due to frequent stoppages and rework
- FPY hovered around 82%, with many parts needing manual correction
- MTTR averaged 45 minutes, causing cascading delays
After installing Position Automation’s lights out machine system:
- OEE rose to 78% within 3 months
- FPY improved to 96%, with near-zero rework
- MTTR dropped to 12 minutes, thanks to modular access and smart diagnostics
The result? A leaner, faster, more reliable production line, and a team empowered by real-time visibility and control.
Metrics + Automation = Lean Mastery
When you align your automation strategy with the right lean metrics, you unlock:
- Smoother flow
- Higher quality
- Faster response
- Lower costs
- Greater confidence
At Position Automation, we don’t just build machines, we build systems that help you measure what matters and improve what counts.
Ready to Master Your Metrics?
Let’s talk about how we can help you boost OEE, improve FPY, and reduce MTTR, all while building a smarter, leaner operation.
Discover how we optimise production at www.position-automation.co.uk or contact us at sales@position-automation.co.uk
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