MILLING MACHINE OPERATIONS - OD1644 - LESSON 1/TASK 2
The cutting edge is the angle on each tooth which
performs the cutting.
The land is the narrow surface behind the cutting edge of each
Rake Angle. The rake angle is the angle formed between the face of
the tooth and the centerline of the cutter.
The rake angle defines the
cutting edge and provides a path for chips that are cut from the workpiece.
Primary Clearance Angle. The primary clearance angle is the angle of
the land of each tooth, measured from a line tangent to the centerline of
the cutter at the cutting edge. This angle prevents each tooth from rubbing
against the workpiece after it makes its cut.
Secondary Clearance Angle. The secondary clearance angle defines the
land of each tooth and provides additional clearance for the passage of
cutting oil and the chips.