CLEARANCE ANGLE: The angle between a plane containing the end surface of a cutting tool and a plane passing through the cutting edge in the DIRECTION of cutting motion.Rake angle:Rake angle is the angle between the rake surface and the reference plane as measured on another plane. It indicates the ORIENTATION of the rake surface of the cutting tool.Cutting wedge angle:It is the angle between the two intersection lines formed as the corresponding plane of measurement intersects with the rake and flank planes.From fig. aboveCutting wedge angle + Rake angle + Clearance angle = 90 degreeTherefore, the SUM of cutting edge angle, clearance angle, and rake angle is 90°