For drilling extremely hard metals, what angle is ideal?

The ideal angle for drilling extremely hard metals is generally around 40 degrees because this angle helps to achieve a balance between cutting edge strength and the ability to remove material effectively. At 40 degrees, the drill point geometry is optimized for providing sufficient cutting action while minimizing heat generation and wear on the tool.

Drilling into hard materials can create significant stress on the tool, and having a point angle that is too acute can lead to rapid dulling and ineffective cutting. Conversely, a point angle that is too obtuse may not penetrate the material efficiently. The 40-degree angle strikes an effective compromise, allowing for improved penetration and chip removal, which is critical when working with harder materials where precision and tool longevity are paramount. Using an optimal angle helps maintain tool integrity and enhances drilling performance, making it the most suitable choice in this context.