In Base pressing, or bottoming, the punch presses the workpiece versus the bottom floor of the V or U-shaped die, which defines the ultimate bend angle. This method generates precise bends and lowers the tendency for springback within the workpiece because of the application of increased bending pressure. Using information/sandpaper https://gunner1jk67.blgwiki.com/1122832/indicators_on_stamping_iron_plate_you_should_know