Challenge: Stringent Aerospace Requirements vs. Unproven Supplier
An Israeli defense contractor, Elbit Systems, needed a reliable 5 axis supplier qualification for complex aluminum and titanium components used in unmanned aerial vehicles (UAVs). Their existing European suppliers faced 14-week lead times and 35% higher costs. The procurement team required a Chinese partner capable of holding ±0.005 mm tolerances on 5-axis CNC machined parts, with full traceability and ITAR-compliant documentation. Initial audits of three potential suppliers revealed gaps in quality management systems and insufficient experience with aerospace alloys.
Solution: Rigorous Qualification Protocol
We designed a phased 5 axis supplier qualification program with Shenzhen Precision Tech Co., Ltd. (SPT), a mid-sized factory with DMG MORI DMU 80 P duoBLOCK machines. The plan included:
- Phase 1 – Capability Audit: On-site inspection of 12 5-axis machines, CMM equipment, and ISO 9001:2015 + AS9100D certifications.
- Phase 2 – Sample Run: Production of 50 test parts (7075-T6 aluminum bracket) with full dimensional inspection report.
- Phase 3 – Process Validation: 30-day continuous production run of 500 titanium (Ti-6Al-4V) components with SPC monitoring.
SPT invested $200,000 in new Renishaw probing and automated tool wear compensation systems to meet requirements.
Process: Step-by-Step Qualification
- Pre-Qualification: SPT submitted 3D models and DFM analysis. Elbit engineers reviewed and approved tool paths.
- First Article Inspection (FAI): 100% dimensional check on 23 critical features using Zeiss CMM. Pass rate: 98.7%.
- Process Capability Study: Cpk values for critical dimensions ranged from 1.67 to 2.14 (target >1.33).
- Material Certification: Mill certificates and chemical analysis for all incoming stock.
- Final Audit: Elbit quality team spent 5 days at SPT reviewing procedures, training records, and calibration logs.
Total qualification time: 8 weeks – 40% faster than typical European supplier onboarding.
Results: Cost Reduction and Lead Time Improvement
| Metric | Before (European) | After (SPT) | Improvement |
| Unit Price (Aluminum Bracket) | $12.50 | $7.80 | 37.6% reduction |
| Lead Time (Weeks) | 14 | 6 | 57% faster |
| Defect Rate (PPM) | 850 | 120 | 85.9% reduction |
| First Pass Yield | 92% | 98.5% | 7% improvement |
Over 18 months, Elbit sourced 2,400 parts from SPT with zero delivery delays. The 5 axis supplier qualification saved $1.2M annually and enabled faster UAV production cycles.
Key Takeaways for Procurement Professionals
- Invest in on-site audits: Face-to-face evaluation of machine condition, operator skill, and quality culture is irreplaceable.
- Demand process capability data: Cpk values >1.33 ensure repeatable precision.
- Start with simple parts: Begin qualification with less complex geometries to build trust.
- Leverage Chinese cost advantages: Typical savings of 30-50% on 5-axis machining are achievable with proper qualification.
This aerospace cnc case study demonstrates that a structured 5 axis supplier qualification program can unlock high-quality, cost-effective manufacturing in China for demanding defense applications.
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