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Shearing begins with the punch or blade presses against the sheet metal. Initially, cracks form in the sheet on both the top and bottom. As the punch plunges further, these cracks grow wider and eventually, the punch separates the sheet. Shape and quality of the sheared edge are determined by the clearance between the punch and the die. The optimum range for clearance is between 2 to 10% of the sheet thickness. This range will provide the best results. If the clearance were to increase beyond this, the sheet metal tends to be pulled towards the die, making the edges of the sheared area rougher. Th quality of the sheared edge is also affected by the punch speed. The greater the punch speed, the better the quality.

The machine which carries out the shearing process is called power shear. It can be operated manually by labourers or can use advanced modes like hydraulic, pneumatic, or electric power.