**Recommended Processing Parameters for Quenched and Tempered (Pre-hardened) Products (42-60°)** **Six-flute Milling Cutter** | Processing Technology | Full Cutter Layered Roughing | Layered Finishing | Side Edge Roughing | Side Edge Finishing | |-----------------------|------------------------------|-------------------|---------------------|---------------------| | Diameter (mm) | Layered Depth | s/f | Depth/Side | s/f | Depth/Side | s/f | Layered Depth | s/f | | 2 | 0.1 | 6000/600 | 2.5/0.05 | 6000/300 | 2.5/0.1 | 6000/500 | 2.5/0.05 | 6000/300 | | 3 | 0.15 | 6000/600 | 8/0.05 | 6000/300 | 8/0.1 | 6000/500 | 8/0.05 | 6000/300 | | 4 | 0.2 | 5500/600 | 11.5/0.1 | 5500/300 | 11.5/0.1 | 4500/500 | 11.5/0.1 | 5500/300 | | 5 | 0.2 | 5500/600 | 13.5/0.1 | 4500/400 | 13.5/0.1 | 4000/500 | 13.5/0.1 | 4500/400 | | 6 | 0.25 | 5000/600 | 17.5/0.1 | 4000/400 | 17.5/0.2 | 3500/600 | 17.5/0.1 | 4000/400 | | 8 | 0.3 | 5000/700 | 23.5/0.1 | 3500/400 | 23.5/0.2 | 3000/600 | 23.5/0.1 | 3500/400 | | 10 | 0.5 | 3000/700 | 29.5/0.1 | 3000/400 | 29.5/0.25 | 2600/600 | 29.5/0.1 | 3000/400 | | 12 | 0.6 | 2800/700 | 34.5/0.1 | 2600/400 | 34.5/0.3 | 2400/600 | 34.5/0.1 | 2600/400 | | 14 | 0.6 | 2450/650 | 44.5/0.1 | 2000/300 | 44.5/0.35 | 2000/500 | 44.5/0.1 | 2000/300 | | 16 | 0.6 | 2200/500 | 44.5/0.1 | 1600/300 | 44.5/0.4 | 1800/500 | 44.5/0.1 | 1600/300 | | 18 | 0.6 | 2000/500 | 44.5/0.1 | 1500/300 | 44.5/0.5 | 1600/500 | 44.5/0.1 | 1500/300 | | 20 | 0.6 | 2000/500 | 44.5/0.1 | 1200/250 | 44.5/0.5 | 1500/500 | 44.5/0.1 | 1200/250 | **Notes**: - For rough cutting, ensure the coolant is fully applied. Insufficient coolant will directly burn the tool. - During finishing, adjust *s/f* appropriately based on product stability. If chatter marks appear, adjust *s*. - When the machine speed cannot reach the value, adjust *s/f* accordingly. For smoother finishing, cool the coolant and use air to blow away chips for better results.