MITSUBISHI MATERIALS (THAILAND) CO., LTD.

Lathe Cutting Inserts Shapes ｜ Applications and Selection Guide

Learn how different lathe cutting insert shapes (square, triangle, round, hexagon, octagon) suit various machining tasks.
■ Introduction
Choosing the correct lathe cutting insert shape is critical in machining. Each shape offers unique benefits, whether for strength, precision, or tool life. Using the right insert not only improves accuracy but also reduces wear and enhances cost efficiency.
1. Square Insert (C, D, W, etc.)
Key Feature: Strong cutting edges with wide cutting angles for excellent force support.
Applications:
・ General turning and milling
・ High feed rate operations
・ Suitable for common materials such as steel and cast iron
2. Triangle Insert (T, V, etc.)
Key Feature: Smaller cutting angles, designed for high precision.
Applications:
Precision turning (finishing work)
・ Reduces cutting forces during machining
・ Best for softer materials like aluminum and stainless steel
3. Round Insert (R)
Key Feature: Very robust with excellent impact resistance.
Applications:
・ Rough turning operations
・ Machining hard materials such as hardened steels and cast iron
・ Extends tool life by minimizing impact forces
4. Hexagon and Octagon Insert (H, O)
Key Feature: Multiple cutting edges for extended tool usage.
Applications:
・ Grooving applications
・ Face milling and contour milling
・ Cost-efficient option due to multiple edges in one insert
■ Quick Selection Guide
・ Round Insert (R): Best for high strength and heavy-duty cutting
・ Square Insert (C/D/W): General-purpose turning and milling
・ Triangle Insert (T/V): High-precision finishing work
・ Hexagon/Octagon Insert (H/O): Extended tool life with multiple cutting edges
At MMC Hardmetal (Thailand) Co., Ltd. we provide high-quality cutting tools and inserts designed for various machining needs. Our engineering team supports manufacturers in selecting the right tool for higher efficiency and durability.
■ For more details, you can download our PDF guide or contact us directly.
#LatheCuttingInserts #MachiningTips #CNC #Metalworking #ToolSelection #ManufacturingSolutions

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