Core Specifications & Design Advantages

1. CNMG120408 Geometry: Strength & Precision Balance

• Key Dimensional Traits:
  • 12: 12mm inscribed circle (IC), compatible with standard CNMG tool holders (e.g., CCLNR1212H12, CCLNL1616H12) for small-to-medium CNC lathes (Haas ST-20, Fanuc 0i-TF) and precision manual lathes—no custom adapters needed for most workshop setups.
  • 04 (Thickness): 4.0mm thickness, providing structural rigidity to handle semi-roughing cuts (depth up to 4mm in steel) while minimizing micro-vibration. Critical for avoiding dimensional errors in thick-walled parts (e.g., 3-8mm steel brackets) or medium-diameter shafts (15-30mm).
  • 08 (Nose Radius): 0.8mm nose radius—the defining feature for versatility: wider than fine-radius inserts (0.4mm), so it withstands higher cutting forces for semi-roughing (removing excess material from blanks); yet precise enough for finishing, delivering Ra ≤1.2μm surfaces for assembly-ready parts.
• 80° Rhombic Positive-Rake Design: Sharp, polished positive rake edge reduces cutting force by 20% vs. negative rake inserts. This prevents workpiece deformation (even for thin-walled steel housings) and eliminates "edge burring"—a common flaw in generic roughing inserts that requires extra deburring time.

2. MA Chipbreaker: Optimized for Dual-Task Chip Control

• Anti-Chip Clogging: Deep, contoured chip pockets split thick ferrous chips (from steel/alloy semi-roughing) into small, manageable fragments. Prevents chips from wrapping around medium-diameter shafts (e.g., 20mm gear blanks) or clogging the tool, which causes surface scratches or costly jams.
• Directed Evacuation: Polished, angled chip channels guide chips away from the cutting zone, avoiding re-cutting (a major cause of poor finish quality on precision surfaces like hydraulic housing faces). Protects delicate features (e.g., stepped edges on mechanical shafts) from chip damage.
• Dual-Use Efficiency: Works seamlessly for semi-roughing (trimming cast iron blanks or steel forgings) and finishing (refining surfaces to Ra ≤1.2μm). Eliminates the need to switch inserts mid-project, cutting setup time by 30% and simplifying tool inventory.

3. VP15TF Grade: Durability & Precision for Ferrous Machining

• Micro-Grain Hardness: 0.5-0.7μm grain size (HV≥1800) resists abrasive wear from cast iron (HT200-HT300) and hardened alloy steel (up to HRC 38). Extends insert life by 50% vs. standard grades, maintaining sharpness for 1600+ semi-roughing cycles or 1300+ finishing cycles on mild steel (1018).
• Anti-Adhesion Traits: Low-friction surface minimizes built-up edge (BUE) on steel—prevents scratch marks on finished surfaces and ensures consistent dimensional accuracy (±0.003mm) for precision components like hydraulic fittings or gear blanks.
• Thermal & Chipping Resistance: Withstands temperatures up to 850°C (generated in high-speed turning, 120-200 m/min for steel) without edge softening. Balanced toughness prevents edge damage when cutting uneven cast iron surfaces or interrupted cuts (e.g., turning near shaft shoulders), avoiding costly rework of high-value parts.

Performance & Compatibility

• Ideal Applications:
  • Semi-roughing steel/cast iron blanks: mild steel shafts (15-30mm diameter), HT200 pump casings, and steel forging blanks.
  • Finishing functional parts: mechanical shafts, gear blanks, hydraulic valve bodies, and industrial brackets requiring ±0.005mm tolerances.
  • Turning complex parts with both rough and finished sections (e.g., stepped shafts with a rough base and finished end for assembly).
• Tool Holder Fit: Works with all standard CNMG-series tool holders designed for 12mm IC inserts (e.g., CCLNR1212H12, CCLNL1616H12)—simplifies setup for CNC or manual lathes.
• Coolant Synergy: Pair with water-soluble coolants to enhance chip evacuation (critical for semi-roughing) and extend VP15TF life. For hardened alloy steel (HRC 35+), use cutting oil to further reduce thermal stress and protect the sharp cutting edge.

Practicality & Quality Assurance

• Protective Packaging: Each insert is packed in an anti-scratch plastic tray to preserve the 0.8mm nose radius, sharp cutting edge, and VP15TF surface—minor damage here would ruin roughing efficiency (uneven material removal) and finishing quality (surface scratches).
• Clear Identification: Laser-marked with "CNMG120408-MA VP15TF" for quick selection, preventing mix-ups with fine-radius (0.4mm) CNMG inserts or non-ferrous-specific tools in busy workshops.
• Precision Testing: Every insert undergoes laser dimensional inspection (±0.002mm tolerance on IC, thickness, and nose radius) and edge integrity checks, ensuring uniform performance across production runs—critical for meeting industrial quality standards (e.g., ISO 9693).