SINGLE POINT CUTTING TOOL

 

SINGLE POINT CUTTING TOOL

Fig. 1 | SINGLE POINT CUTTING TOOL

ANGLES IN SINGLE POINT CUTTING TOOL:

BACK RAKE ANGLE: - It is the downward slope of the top surface from the nose to the rear along the longitudinal axis.

• This angle guides the direction of chip flow.
• Softer the material, Positive rake angle should be greater.
• Back rake angle should be – Positive, Zero, Negative.

SIDE RAKE ANGLE: - It is the slope of the top surface of the tool to the sideways in direction perpendicular to the longitudinal axis.

• This angle also guides the chip flow away from the job.

END CUTTING EDGE ANGLE: - It is the angle between minor flank and the plane perpendicular to the side of shank.

OR It is the angle between face of the tool and a line tangent to the machine surface.

• This angle is allowing a small section of the cutting edge to contact the machine surface.

SIDE CUTTING EDGE ANGLE: - It is the angle between side cutting edge and longitudinal axis of the tool.

• Avoid the formation of built up edge.
• This angle also distributes the cutting force.
• Side Cutting Edge Angle is 0⁰ for Knife edge cutting tool and 90⁰ for Parting off tool.

SIDE RELIEF ANGLE: - Angle between the surface of flank immediately below the point and a plane at right angles to the centre line of the point of the tool.

END RELIEF ANGLE: - Angle between the surface of flank immediately below the point and a line drawn from the point perpendicular to the base.

LIP ANGLE: - (60⁰ – 80⁰)

This is the angle between tool face and ground end surface of the flank.

NOSE RADIUS: - It is the radius of Nose.

• Small Nose Radius – Excessive stress concentration and greater heat generation.
• Increase Nose Radius – Increase Tool life.

 

TOOL SIGNATURE: - (7 Elements)

Fig. 2 | TOOL SIGNATURE