ORTHOGONAL AND OBLIQUE CUTTING .
Introduction • There are two basic methods of metal cutting with a single point cutting tool: (i) Orthogonal cutting (or two dimensional cutting) (ii) Oblique cutting (or three dimensional cutting) Orthogonal cutting and Oblique cutting : • The cutting condition in which the chip flows in orthogonal plane, irrespective of any other geometry is known as orthogonal cutting, In this case λ =0. • If the chip does not flow in orthogonal plane and deviates from it by some angle, the cutting condition is known as oblique cutting. Here λ ≠0 and c = λ .
Ideal direction of chip flow in turning •While turning ductile material by a sharp tool, the continuous chip would flow over the tool’s rake surface and in the direction apparently perpendicular to the principal cutting edge, i.e., along orthogonal plane which is normal to the cutting plane containing the principal cutting edge (Fig). But practically, the chip may not flow along the orthogonal plane for several factors.
Role of inclination angle on chip flow direction