Fig. 1. Flowchart of lens machining CAD/CAM system

Fig. 2. Frame scanning and measurement process

Fig. 3. Coordinate system transformation relationship

Fig. 4. Machine tool coordinate system

Fig. 5. Process of spline curve fitting

Fig. 6. Tool motion analysis

Fig. 7. Relationship of tool axis and tool path with machined surface

Fig. 8. Tool axis vector and tool path

Fig. 9. Post-processing flowchart

Fig. 10. Special conical milling cutter

Fig. 11. Tool cutting relationship

Fig. 12. Five-axis CNC machine lens machining example

Fig. 13. EImage of machined lens edge