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CCMT / CNMG 80° Diamond Turning Inserts | Rough Turning and Semi-Finishing Operations
time：
2025-12-24 14:34
source：
Lizhou
80 °Diamond turning insert ( CCMT / CNMG )—A commonly used cutting tool geometry that is more suitable for rough turning and stable machining.
At Turning inserts During machining, if the workpiece material is relatively hard, the cutting load is high, or prolonged continuous machining is required, the strength and stability of the cutting insert often become more important than its sharpness. In many workshops, during rough turning and semi-finishing stages, turning inserts with larger nose radii are preferred to ensure stable machining processes and reduce the likelihood of chipping or breakage.
CCMT and CNMG It’s very common in this kind of use case. 80 °Diamond-shaped turning insert.
One, 80 The diamond-shaped structure makes it more “durable.”
With 35 ° or 55 ° Compared to diamond blades, 80 ° The diamond-shaped cutting tool has a larger tip angle and a thicker tip position. The direct consequence of this structural design is:
The blade has higher overall strength.
The blade tip has stronger impact resistance.
More stable at large depths of cut and high feeds.
It's not easy to chip or break the blade due to sudden changes in load.
Therefore, CCMT / CNMG It is more suitable for use in operations with large cutting volumes, such as rough turning and semi-finishing turning.
II. CCMT With CNMG The actual difference in usage
Although they are the same 80 °Diamond-shaped turning inserts, but in actual use, CCMT and CNMG There are still different emphases:
CCMT
Cutting is relatively smooth.
Chip removal is relatively smooth.
Commonly used for general turning and semi-finishing.
CNMG
The blade structure is thicker.
Stronger impact resistance
More suitable for continuous processing or conditions with higher loads.
In many workshops, CCMT More inclined toward a “universal style,” while... CNMG It is more commonly found in machining tasks that demand higher durability.
III. The comparison with the small-angle diamond-shaped cutting tool is even more pronounced.
If you put CCMT / CNMG With 35 ° Diamond-shaped turning tool (e.g., VCMT 、 VNMG When placed side by side for comparison, the differences become very obvious:
Small-angle diamond blade
The blade is sharp.
More suitable for finishing.
Surface finish is easier to control.
80 °Diamond-shaped blade ( CCMT / CNMG )
High blade tip strength
More suitable for “getting rid of the materials first.”
More friendly to machining stability
Therefore, in many processing procedures, the first step is to use... CCMT or CNMG After completing the rough turning, use a small-angle blade for finishing.
4. Multiple groove types for convenient selection based on material.
This series offers a variety of groove types to facilitate matching based on different materials and operating conditions.
Universal groove type: Suitable for machining conventional steel parts and stainless steel.
HK Slot: Focuses more on blade edge strength, suitable for cutting operations with higher loads.
PV Slot: Better chip removal performance, suitable for stainless steel.
MA Slot: Striking a balance between stability and chip removal.
By adjusting the groove type, the same cutting edge can handle different materials without the need to frequently change blade models.
5. Wide range of applicable materials and strong versatility.
CCMT / CNMG 80 °Rhombus turning inserts can be used for a variety of common materials, including:
Cast iron
Carbon steel, alloy steel
Ordinary stainless steel
Hardened steel parts and hardened stainless steel
This versatility is highly practical for workshops that handle multiple product varieties, helping to reduce the variety of tools required and alleviate inventory pressure.
6. A stable tungsten steel matrix is the foundation for long-term use.
Lizhou uses a high-quality tungsten steel matrix in this series of turning inserts, enabling the inserts to maintain relatively stable cutting edges even under high-speed or continuous cutting conditions.
In actual processing, this means:
Lower tool-change frequency
The processing rhythm is more stable.
Blade life is more predictable.
These details will gradually demonstrate their value in mass production.
If your machining tasks mainly involve rough turning or semi-finishing, the workpiece material is relatively hard, or you have high requirements for machining stability, then... CCMT / CNMG 80 The rhombus turning insert is a mature and reliable choice.
It doesn’t strive for extreme sharpness, but excels in durability and stability, making it ideal for real-world production environments.
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