What is the included angle of a twist drill for soft metals?

The included angle of a twist drill for soft metals is typically set to 90 degrees. This angle is designed to provide an optimal cutting edge for drilling through softer materials, allowing for effective penetration and chip removal while minimizing the risk of damaging the drill bit. A sharper angle, such as those found in drills for harder materials, may lead to excessive wear or breakage when used on softer metals, as these materials generally require a different approach to maintain efficiency and prolong tool life.

In addition to the included angle, the drill's point geometry is also important; a 90-degree included angle offers a good balance of cutting action and stability, resulting in a cleaner hole with less tendency for the drill to wander, which can be particularly beneficial when precision is required. This angle and design help to ensure that both the hole quality and the drill bit's durability are maintained while working with softer metals.