However, there are limiting factors that can affect the quality of the process, such as material properties, tooling characteristics and operator skills. One of the main problems in sheet metal bending is the deformation of the metal. During the process, the sheet is based on 2 die points and the punch presses the sheet into a third centre point. The material is compressed at the place of the punch pressure and stretched from the underside of the sheet, which generates a visible or invisible deformation. The elongation of the part at each bend depends on the thickness and type of material, bending angle, bending radius and rolling direction. To obtain a more accurate result, it is necessary to make experimental measurements. In some cases, the difference in elongation along the lamination length and width must be taken into account when creating the scan and placing it on the sheet. It is important to note that the more the metal needs to be deformed, the greater the impact needed, requiring more force on a smaller surface area and a smaller lever to apply the force. All other things being equal, bending in a die with a smaller bore requires the application of more force.