An operation in which a chamfer mill makes a peripheral cut along an edge of the workpiece or a feature to create an angled surface, known as a chamfer. It is assumed that the angle of the chamfer is 45 degrees, so that the chamfer width is equal to its height. The chamfer length can be the complete perimeter of a workpiece or feature, just one side, or even a part of a side. Also, a chamfer can be machined on either the exterior or interior of a part and can follow either a straight or curved path.