HAKUSAN, Ishikawa, Japan, Mar 6, 2026 – Nakamura-Tome Precision Industry Co., Ltd. has enhanced its proprietary chip-breaking technology “Triangle Cut*1” and is pleased to announce the release of the evolved version, “High-Speed Triangle Cut.”
High‑Speed Triangle Cut introduces an optimized tool path that addresses the main drawback of the conventional version—longer machining time—while maintaining strong chip‑breaking performance.
Like the conventional Triangle Cut, the advanced version is supported on Nakamura‑Tome box‑way slide machines.
*1 Please refer to the following link regarding the Triangle Cut.
https://www.nakamura-tome.com/corp_news/trianglecut-news/
What is Triangle Cut?
It is an optional function that breaks chips by controlling the cutting path in a triangular motion. By generating this triangular path, the cutting edge periodically moves away from the workpiece, creating air-cutting intervals that divide the chips.
However, because this machining method continuously traces triangular tool paths throughout the entire cutting process, machining time tended to increase to approximately 2.7 to 3 times that of normal machining.
・Example of tool path in normal cutting
・Example of tool path in Triangle Cut
What is High-Speed Triangle Cut?
High-Speed Triangle Cut is a chip-breaking function based on a newly developed machining path that further evolves the conventional Triangle Cut.
In the conventional Triangle Cut, a triangular path is generated continuously throughout the entire machining process. In contrast, High-Speed Triangle Cut allows the pitch of the triangular motion to be adjusted. Sections outside the triangular motion follow a normal turning operation, reducing the cutting distance and significantly shortening machining time.
・Example of tool path in High-Speed Triangle Cut
A video overview of High-Speed Triangle Cut is available on YouTube via the link below.
https://youtu.be/2Y6JnbVbMqg
How to Use High-Speed Triangle Cut
High-Speed Triangle Cut is activated by enclosing the relevant section of the machining program with the dedicated G codes G338 (start) and G339 (end). When the H parameter is specified, the operation switches to High-Speed Triangle Cut mode*2.
*2 If the H parameter is not specified, the operation follows the conventional Triangle Cut motion.
Comparison
A comparison of machining time, surface roughness, and chip condition between High-Speed Triangle Cut and the conventional Triangle Cut, relative to normal cutting, is shown below.
| Normal Cutting | High-Speed Triangle Cut *3 | Triangle Cut | |
| Machining Time | – | 1.5× | 2.7–3× |
| Surface Roughness (Ra) | – | 1.2× | 1.2–2× |
| Chip Condition | Normal (may long chips) | Short controlled chips | Consistently segmented chips |
*3 Overlap ratio: 30%
・Chip Condition
High-Speed Triangle Cut can be used by purchasing the optional Triangle Cut function.
For users who have already implemented the conventional Triangle Cut, a free upgrade to High-Speed Triangle Cut is available through Nakamura Tome’s software update service, “NT Update.”
Ask Nakamura-Tome
https://www.nakamura-tome.com/contact_product.
For more information, about Nakamura-Tome and its products, visit https://www.nakamura-tome.com.
