To make a bend, place the metal to be bent in the center of the brake and adjust the clamping jaw using the adjustment knobs. The clamping jaw has to be parallel to the teeth in order to ensure the bend is true (i.e., 90 degrees) all the way down the bend. The minimum space between the end of the upper jaw/clamping bar (adjusted with the two adjustment knobs on the back) and the bending leaf must be thicker than the material being bent, otherwise the break wants to act like a shear and tries to cut the metal rather than bend it. Any extra space between these two will cause a larger radius bend. With this adjustment set, you can clamp the metal in place with the clamping bar handles. Then lift up the bending leaf using the handles. The bending leaf here has counterweights to help with forming. You can bend the metal from zero degrees well past 90 degrees until the metal hits the top of the clamping jaws.