What is the angle of the upper knife called?

• A. Rake
• B. Bevel
• C. Chamfer
• D. Tilt

Answer: (A)

The angle of the upper knife is called the rake. In sheet metal cutting, rake describes how much the upper blade tilts relative to the lower blade and the workpiece. That tilt controls how the metal shears and how the resulting edge forms. A positive rake helps the tool bite into the metal and pull it cleanly, reducing burr and producing a better edge. Bevel and chamfer refer to the shape of the blade edge itself, not the blade’s tilt in relation to the work, and tilt isn’t a standard term used for this specific blade angle in this context.