Mitsubishi CNMG120412-RK MC5015 Cast Iron Roughing Insert (10pcs)
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CNMG120412-RK MC5015
Cast Iron Roughing Beast | MC5015 Abrasive Barrier | RK Heavy-Duty Edge
Engineered for High Metal Removal in Cast Iron
MC5015 Grade (The Abrasive Shield): Cast iron is highly abrasive due to its graphite structure. The MC5015 is a premium CVD-coated grade featuring a thick Alumina ($Al_2O_3$) layer. This nano-layered coating acts as a thermal shield and a wear barrier, allowing for high cutting speeds without the rapid flank wear that destroys standard inserts.
RK Chipbreaker (Roughing-K Class): The RK geometry is designed for "Process Security." It features a wide land and a robust cutting edge designed to absorb the impact of scale, crust, and interruptions. Unlike finishing breakers, the RK focus is on Edge Toughness, ensuring the insert doesn't chip when taking deep cuts on raw castings.
1.2mm (3/64") Heavy-Duty Radius: The large 12 radius is the secret to this tool's lifespan. It provides a massive heat sink at the corner and significantly increases the strength of the insert tip, making it ideal for high feed rates and heavy depths of cut.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | CNMG120412-RK | 12.7 mm | 4.76 mm | 1.20 mm |
| Imperial | CNMG433-RK | 1/2" | 3/16" | 0.0472" (3/64") |
Heavy Roughing Parameters
*The 1.2mm radius thrives at higher feed rates. For Gray Iron, dry machining is often preferred to maximize coating life.
| Workpiece Material | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Gray Iron (Class 35/FC250) | 200 - 450 m/min | 0.25 - 0.60 mm/r | 2.00 - 6.00 mm |
| Ductile Iron (65-45-12) | 150 - 300 m/min | 0.20 - 0.50 mm/r | 1.50 - 4.50 mm |
Rigid Tool Holders
Due to high radial forces, use PCLNR/L 12 or DCLNR/L 12 series holders:
Shop Heavy-Duty HoldersPro-Tip: MC5015 vs. MC5005
MC5015 (The Rougher): Best for interrupted cuts, castings with skin, and Ductile Iron where toughness is required.
MC5005 (The High-Speed Expert): Switch to MC5005 for high-speed continuous turning in Gray Iron with perfect stability to achieve maximum tool life.
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