For aircraft part manufacturing, In-Process CMM Inspection and Machine Monitoring are often integrated to improve quality, reduce scrap, and maintain traceability required by aerospace standards.
1. In-Process CMM Inspection
An in-process CMM (Coordinate Measuring Machine) inspection system measures critical dimensions during manufacturing rather than waiting until final inspection.
Objectives
- Detect dimensional deviations early.
- Compensate machining offsets automatically.
- Reduce rework and scrap.
- Maintain tight aerospace tolerances.
Typical Workflow
- CNC machine completes a machining operation.
- Part remains on the pallet or fixture.
- In-process CMM or probing system measures critical features:
- Hole position
- Bore diameter
- Surface profile
- Flatness
- Datum features
- Measurement results are compared against CAD/CAM nominal values.
- Automatic tool offset correction is sent to the CNC machine if needed.
- Production continues with corrected parameters.
Common Technologies
- Shop-floor CMMs
- On-machine probing systems
- Laser scanners
- Optical measurement systems
- Digital twins linked to CAD models
Critical Aircraft Components
- Turbine blades
- Engine casings
- Structural brackets
- Landing gear components
- Wing ribs and spars
- Actuator housings
Benefits
- Faster feedback loop
- Reduced non-conformance
- Better process capability (Cp/Cpk)
- Full traceability for aerospace audits
2. Machine Monitoring
Machine monitoring continuously tracks CNC machine health, productivity, and process conditions.
Parameters Monitored
Machine Status
- Running
- Idle
- Setup
- Alarm
- Maintenance
Process Parameters
- Spindle speed
- Feed rate
- Tool wear
- Tool life
- Vibration
- Temperature
- Coolant pressure
Production Metrics
- Cycle time
- OEE (Overall Equipment Effectiveness)
- Utilization
- Downtime causes
- Part count
Aerospace-Specific Monitoring
- Critical dimension trends
- Statistical Process Control (SPC)
- Tool breakage detection
- Thermal drift compensation
- Traceability records
Integrated System Architecture
CNC Machine
│
▼
In-Process Probe / CMM
│
▼
Quality Database (SPC)
│
├── Tool Offset Correction
│
├── Quality Dashboard
│
└── MES / ERP System
Machine Monitoring Platform
│
▼
Real-Time AnalyticsKey Aerospace Standards Supported
- AS9100
- NADCAP
- SAE International requirements for process control
- First Article Inspection (FAI) documentation
Typical KPIs
| KPI | Target |
|---|---|
| First Pass Yield | >98% |
| Scrap Rate | <1% |
| Machine Utilization | >85% |
| Cpk | >1.33 |
| Dimensional Defects | Near Zero |
| Unplanned Downtime | <5% |
Expected Benefits for Aircraft Parts Manufacturing
- 20–50% reduction in scrap and rework
- Improved dimensional consistency
- Faster root-cause analysis
- Better compliance with aerospace regulations
- Higher machine utilization and throughput
- Complete digital traceability from machining to final inspection
For a modern aerospace facility, the most effective approach is a closed-loop manufacturing system where in-process CMM data automatically adjusts CNC machining parameters while machine monitoring provides real-time visibility into equipment performance and process capability.
