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2025
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What is the difference between CNMG and TNMG insert?
In metal cutting, inserts are essential tools for achieving both machining efficiency and workpiece precision. Among machining professionals, CNMG and TNMG inserts are two of the most commonly used turning inserts.
The letters in CNMG and TNMG designations indicate the insert's geometry and key characteristics. For example, in CNMG, "C" stands for an 80° diamond tip, "N" indicates no tolerance, "M" represents medium precision, and "G" refers to the clamping type. For TNMG, the "T" indicates a 55° diamond tip, while the remaining letters have the same meanings as CNMG. This notation highlights the geometric differences between the two inserts, which directly affect their cutting performance.
The larger diamond tip angle of CNMG inserts provides a stronger tip, making them ideal for rough turning and heavy material removal, as they can withstand higher cutting forces. In contrast, the smaller diamond angle of TNMG inserts makes them better suited for precision turning and fine machining, and their sharper tips allow for smoother surface finishes.
In practice, CNMG inserts are commonly used for machining steel, cast iron, and medium-hard materials, especially for workpieces that require high material removal. TNMG inserts are primarily used for precision work, stainless steel, and thin-walled parts, helping to achieve a smooth finish while minimizing vibration and deformation.
When choosing an insert, consider the workpiece material, machining method, and required surface quality. Generally, CNMG inserts are more suitable for rough turning or hard materials, whereas TNMG inserts are better for fine turning or applications that demand high surface quality. Additionally, factors like insert-to-toolholder fit, clamping method, and cutting conditions should be taken into account to ensure optimal performance.
For more information on selecting the right turning inserts, feel free to contact us today.
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