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 00for 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)

TOOL SIGNATURE
Fig. 2 | TOOL SIGNATURE