The rake angle in end mill geometry refers to the inclination of the cutting edge relative to the material being cut. It influences cutting forces, chip formation, and overall tool performance. A positive rake angle means the cutting edge is angled forward, shearing material more efficiently with lower cutting forces, making it ideal for softer materials like aluminum. A neutral rake has little to no inclination, offering a balance between cutting efficiency and edge strength. A negative rake angle tilts the cutting edge backward, increasing edge strength and tool life but requiring more force to cut, making it suitable for harder materials.
