Which cutting tool angle is defined as the angle between the side cutting edge and the plane perpendicular to the direction of feed travel?

The side rake angle is defined as the angle between the side cutting edge of the tool and a plane that is perpendicular to the direction of the feed travel. This angle is critical as it influences how the cutting tool engages with the material being machined. A positive side rake angle can reduce cutting forces and improve chip flow, resulting in better surface finish and tool life. Conversely, a negative side rake angle may increase cutting forces and wear on the tool.

Understanding the orientation of the side rake angle is essential for efficient machining operations, as it directly affects the tool's cutting performance, the quality of the machined surface, and the overall effectiveness of the cutting process. Proper selection of this angle is crucial in various machining scenarios, including turning and milling operations.