Mitsubishi CNMG120412-RP MC6025 Heavy Roughing Steel Insert (10pcs)
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CNMG120412-RP MC6025
Maximum Metal Removal | MC6025 Impact Grade | RP Heavy-Feed Geometry
Engineered for Extreme Roughing Conditions
MC6025 Grade (Nano-Texture CVD): The MC6025 is Mitsubishi's benchmark grade for steel turning versatility. It utilizes a Nano-texture CVD coating that provides an incredibly tough Al2O3 layer. This prevents the cutting edge from thermal cracking during heavy roughing and offers the impact resistance necessary to survive interrupted cuts on large forged shafts or hexagonal bars.
RP Chipbreaker (Maximum Edge Support): The RP (Roughing-Positive) geometry is built for high-depth-of-cut (Ap) and high-feed (fn) scenarios. It features a significantly reinforced cutting edge land that resists the massive pressures of heavy chip loads. The "Positive" aspect of the breaker ensures that despite its strength, it still slices through the material with reduced horsepower requirements compared to traditional flat-top roughers.
1.2mm (3/64") Heavy-Duty Radius: The larger 12 radius is the secret to this insert's durability. It provides a massive heat sink at the tool tip and a much stronger corner than the 08 radius, making it nearly immune to corner chipping during heavy scale removal.
Metric vs. Imperial Comparison
| System | Model Designation | I.C. (Inscribed Circle) | Thickness | Radius (RE) |
|---|---|---|---|---|
| Metric | CNMG120412-RP | 12.7 mm | 4.76 mm | 1.20 mm |
| Imperial | CNMG433-RP | 1/2" | 3/16" | 0.0472" (3/64") |
Recommended Roughing Parameters
*The 1.2mm radius allows for higher feed rates. For best surface results, ensure the feed rate is at least 25% of the corner radius.
| Workpiece Material | Speed (Vc) | Feed (fn) | Depth (Ap) |
|---|---|---|---|
| Carbon Steel (1045/S45C) | 150 - 320 m/min | 0.30 - 0.70 mm/r | 2.00 - 6.00 mm |
| Alloy Steel (4140/SCM440) | 120 - 280 m/min | 0.25 - 0.60 mm/r | 1.50 - 5.00 mm |
Heavy-Duty Tool Holders
Avoid shim damage under high loads with DCLNR/L 12 or PCLNR/L 12 series holders:
Shop PCLNR 12 HoldersPro-Tip: When to choose the 1.2mm (12) Radius
Efficiency: Use the 1.2mm radius when you need to push feed rates above 0.45 mm/r while maintaining edge stability.
Interrupted Cuts: If you are breaking corners on an 0.8mm (08) insert while roughing, the 1.2mm radius is the immediate solution to increase process security and tool life.
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