The eyewear manufacturing industry is undergoing a quiet revolution. The best factories are no longer choosing between automation and artisanship — they’re building workflows where CNC precision enables hand-finishing to achieve results neither could accomplish alone.
The Hybrid Manufacturing Model
Modern 5-axis CNC machining has dramatically improved consistency and reduced lead times. Today’s leading factories combine automated rough cutting with skilled hand-tumbling, hand-polishing, and manual assembly. This hybrid approach delivers tolerances of ±0.05mm on complex geometries — impossible with purely manual methods — while preserving the tactile quality and subtle variations that define luxury eyewear.
The 12-Stage Acetate Production Process
- Material Inspection: Every sheet of acetate is visually and dimensionally verified against specifications.
- CNC Rough Cutting: 3-axis CNC routers cut frame blanks to ±0.1mm tolerance.
- Shape Grinding: Automated profile grinders refine the outer frame contour.
- Hinge Slotting & Assembly: Precision drilling and hinge insertion, hand-verified for alignment.
- Barrel Tumbling (Stage 1): 24-hour wet tumbling with ceramic media removes machining marks.
- Hand Inspection: 100% visual inspection for surface defects before polishing.
- Barrel Tumbling (Stage 2): Fine polishing compound produces optical-grade surface clarity.
- Hand Polishing: Artisans address specific areas requiring edge refinement.
- Temple Assembly: Spring hinges installed and tested to 1000-cycle opening/closing standard.
- Lens Opening: Precision lens opening cut to ±0.05mm for consistent lens fit.
- Final Inspection: Frame geometry, hinge function, surface quality, and measurements verified.
- Packaging: Individual frame pouches, brand-specific box sets, and carton labeling.
Chengye’s production line integrates Japanese CNC machining centers with a 60-person finishing team, achieving a production capacity of over 3 million pairs annually. Each stage is documented in our ISO9001-compliant quality management system.