How to Use TNMG Inserts for External and Internal Turning

choosing the right cutting tools is crucial in the machining industry, particularly when it comes to turning operations. among the various options available, tnmg inserts are a popular choice for both external and internal turning applications. this article will guide you on how to use tnmg inserts effectively for your turning needs.

what are tnmg inserts?

tnmg inserts feature a triangular shape with a flat top, providing four cutting edges for extending tool life and reducing tool change frequency. the designation 'tnmg' signifies their design: 't' for triangular, 'n' for negative rake, 'm' for metric, and 'g' for the geometrical configuration. these inserts are designed to offer superior performance in various materials, including steel, stainless steel, aluminum, and non-ferrous metals.

benefits of using tnmg inserts

1. versatile cutting edges: with four edges, tnmg inserts can be flipped and rotated, providing a longer lifespan compared to single-edge inserts.

2. improved chip control: their geometric design allows for efficient chip removal, reducing the likelihood of re-cutting chips and enhancing productivity.

3. cost-efficiency: the longevity of tnmg inserts translates to reduced operational costs over time, as fewer inserts are needed for the same amount of work.

using tnmg inserts for external turning

1. setting up the tool: when using tnmg inserts for external turning, ensure that the insert is correctly placed in the tool holder. use the designated screws and tightening settings recommended by the manufacturer.

2. selecting parameters: choose the appropriate cutting speed, feed rate, and depth of cut based on the material being turned. refer to the tool manufacturer’s guidelines for optimal settings.

3. orientation and angle: pay attention to the insert’s orientation. for external turning, typically, a setting of around 15 degrees for the tool’s edge angle is common to ensure effective cutting.

4. monitoring performance: watch for signs of wear or damage during machining. replace the insert as needed to maintain product quality and ensure consistent cutting performance.

using tnmg inserts for internal turning

1. tool holder selection: for internal turning, a suitable tool holder is essential to place tnmg inserts at the correct angle for effective cutting within the bore.

2. adjusting feed and speed: similar to external turning, setting the right parameters is crucial, but internal turning often requires slower feed rates to handle the confined space inside a workpiece.

3. insert orientation: ensure the insert is positioned to allow for proper clearance and avoid any interference between the tool and the workpiece.

4. evaluating finished work: check the surface finish after turning, as internal turning can sometimes lead to less favorable outcomes. fine-tune your parameters as necessary for improved results.

conclusion

using tnmg inserts for both external and internal turning can significantly enhance machining productivity and efficiency. by understanding the unique properties of these inserts and following best practices for setup and operation, you can achieve exceptional results in your turning operations. always consult the insert manufacturer's recommendations for specific materials and applications to ensure optimal performance.