Nomenclature of Milling Cutter

Radial Rake Angle: It is the angle between the flute face and a radial reference plane XX drawn from the cutter axis to the cutting edge. Positive radial rake angle is used for high speed cutters and to cut the soft materials like aluminium. Negative rake angle is used for high speed milling with carbide tipped cutter and to cut the hard materials.

Relief Angle: It is the angle between the land and a tangent to the cutter from the tip of the tooth. It eliminates the tendency of the teeth to rub the work. The angle may vary from 3° to 5°, with higher angles 8°–10° for smaller diameter and soft work materials.

Clearance Angle: It is angle between the back of the tooth and a tangent to the cutter from the tip of the tooth (Figure 19.50).

Figure 19.50 Nomenclature of Milling Cutter