Basic Turning

What is cutting resistance?

Cutting resistance not only causes deformation of the workpiece and tool holders, but is also important in deciding such factors as the cutting power required, the workpiece holding method and the machining procedure.

The figure shows the relationship between the cutting edge and the workpiece. Plastic deformation of the chip is induced mainly from the cutting edge to the machined surface in the direction of an angle φ. This is called the shear angle.

When tools cut a workpiece and generate chips, the workpiece is subjected to large plastic deformation. At this time, some of the force necessary for this plastic deformation is directed through the tool. This force is known as cutting resistance.

Cutting resistance and cutting power

Depth of cut (h)

Chip thickness (hc)

Shear angle

Work piece

Cutting edge

Cross section of cut