Cutting Tool

Engineering Production 1
(EngM 324)

Cutting Tool Angles and their Significance
Dr. Amr Shehata Fayed, Ph.D.
Associate Professor

Importance of clearance angle in cutting process
P

Leading Edge

Cutting

F

Tool
Workpiece (a) Heel fouls work and prevents leading edge from cutting
Dr. Amr Shehata Fayed

Mech. Eng. Dept., College of Engineering, Jazan University

Cutting Tool Angles – Page 2

Clearance Angle
 (a) Flat Surface (6o to 8o) P

F

Clearance angle (b) Heel cleared away allowing leading edge to enter the workpiece, cutting action.
Dr. Amr Shehata Fayed
Mech. Eng. Dept., College of Engineering, Jazan University

Cutting Tool Angles – Page 3

Clearance Angle
 Clearance angle is defined as: the angle between the flank face of the tool and the tangent to the work surface originating at the cutting edge.

 All cutting tools must have clearance angle. However, an excessive angle will not increase the efficiency of cutting and may weaken the tool.  It is affected by the shape of the work. (a) Flat surfaces (shaping)

(b) External cylinders (turning)
(c) Internal cylinders (boring)
Dr. Amr Shehata Fayed
Mech. Eng. Dept., College of Engineering, Jazan University

Cutting Tool Angles – Page 4

Clearance Angle
 (a) External Cylinder ( 5o to 7o )

P

F

Shape of work helps to create Clearance
Dr. Amr Shehata Fayed
Mech. Eng. Dept., College of Engineering, Jazan University

Clearance Reduced

Cutting Tool Angles – Page 5

Clearance Angle
 (b) Internal Cylinder ( 8o upwards)

P

X
Primary Clearance
Dr. Amr Shehata Fayed

F

Secondary Clearance prevents fouling at point X through shape of work
Cutting Tool Angles – Page 6

Mech. Eng. Dept., College of Engineering, Jazan University

Single Point Cutting Tool
Right-Hand Cutting Tool

(a) Schematic illustration of a right-hand cutting tool for turning. Although these tools have traditionally been produced from solid toolsteel