Rake Angle in Cutting Tools

Definition: The angle made by the face of the tool and the plane parallel to the base of the cutting tool is called the rake angle.

Explanation: The rake angle is an important parameter in determining the cutting performance of a tool. The rake angle is the angle between the face of the tool and a line perpendicular to the cutting edge. It is measured in degrees and is positive when the face of the tool is inclined towards the cutting edge and negative when it is inclined away from the cutting edge.

Importance: The rake angle has a significant impact on the cutting performance of a tool. A positive rake angle reduces cutting forces and improves chip formation, while a negative rake angle increases cutting forces and makes chip formation more difficult. Therefore, it is important to select the appropriate rake angle based on the workpiece material, cutting conditions, and tool geometry.

Types: There are three main types of rake angles:

- Positive Rake Angle: The face of the tool is inclined towards the cutting edge. It is commonly used for soft materials and low cutting speeds.

- Zero Rake Angle: The face of the tool is perpendicular to the cutting edge. It is commonly used for hard materials and high cutting speeds.

- Negative Rake Angle: The face of the tool is inclined away from the cutting edge. It is commonly used for tough materials and high cutting forces.

Conclusion: The rake angle is an important parameter that affects the cutting performance of a tool. Therefore, it is important to select the appropriate rake angle based on the workpiece material, cutting conditions, and tool geometry.