Orthogonal cutting :

• Cutting edge of tool is normal to cutting velocity direction.

• The direction of chip flow velocity is perpendicular to the edge of tool

• Cutting edge is longer than the width of the cut.

• orthogonal type of cutting is called 2 - dimensional cutting.

• In this type of cutting, tool life is less.

Oblique cutting :

• Cutting edge of tool is inclined at acute angle to cutting velocity direction.

• The direction of chip how velocity is at an angle with normal to cutting edge of tool.

• Cutting edge may or may not longer than width of cut.

• Oblique cutting is called 3 - dimensional cutting.

• More tool life.