made, place a piece of metal of the desired thickness in the  folder and raise the operating handle until the small roller  rests on the cam. Hold the folding blade in this position and  adjust the setscrews until the metal is clamped securely and  evenly the full length of the folding blade. After the folder  has been adjusted, test each end of the machine separately  with a small piece of metal by actually folding it. There are two positive stops on the folder, one for 45° folds  or bends and the other for 90° folds or bends. A collar is  provided that can be adjusted to any degree of bend within  the capacity of the machine. For forming angles of 45° or 90°, the appropriate stop is  moved into place. This allows the handle to be moved  forward to the correct angle. For forming other angles, the  adjustable collar is used. This is accomplished by loosening  the setscrew and setting the stop at the desired angle. After  setting the stop, tighten the setscrew and complete the bend.  To make the fold, adjust the machine correctly and then  insert the metal. The metal goes between the folding blade  and the jaw. Hold the metal firmly against the gauge and  pull the operating handle toward the body. As the handle  is brought forward, the jaw automatically raises and holds  the metal until the desired fold is made. When the handle is  returned to its original position, the jaw and blade return to  their original positions and release the metal. A brake is similar to a bar folder because it is also used for  turning or bending the edges of sheet metal. The cornice brake  is more useful than the bar folder because its design allows  the sheet metal to be folded or formed to pass through the  jaws from front to rear without obstruction.  [Figure 4-57]  In  contrast, the bar folder can form a bend or edge only as wide  as the depth of its jaws. Thus, any bend formed on a bar folder  can also be made on the cornice brake. The box and pan brake is used to form boxes, pans, and  other similar shaped objects. If these shapes were formed  on a cornice brake, part of the bend on one side of the box  would have to be straightened in order to make the last bend.  With a finger brake, simply remove the fingers that are in the  way and use only the fingers required to make the bend. The  fingers are secured to the upper leaf by thumbscrews. All the  The box and pan brake, often called the finger brake because  it is equipped with a series of steel fingers of varying widths,  lacks the solid upper jaw of the cornice brake.  [Figure 4-58] The box and pan brake can be used to do everything that the  cornice brake can do, as well as several things the cornice  brake cannot do. Most metals have a tendency to return to their normal  shape—a characteristic known as spring-back. If the cornice  brake is set for a 90° bend, the metal bent probably forms  an angle of about 87° to 88°. Therefore, if a bend of 90° is  desired, set the cornice brake to bend an angle of about 93°  to allow for spring-back. The bending capacity of a cornice brake is determined by the  manufacturer. Standard capacities of this machine are from  12- to 22-gauge sheet metal, and bending lengths are from 3  to 12 feet. The bending capacity of the brake is determined by  the bending edge thickness of the various bending leaf bars. In making ordinary bends with the cornice brake, the sheet  is placed on the bed with the sight line (mark indicating line  of bend) directly under the edge of the clamping bar. The  clamping bar is then brought down to hold the sheet firmly  in place. The stop at the right side of the brake is set for the  proper angle or amount of bend and the bending leaf is raised  until it strikes the stop. If other bends are to be made, the  clamping bar is lifted and the sheet is moved to the correct  position for bending. Cornice Brake Box and Pan Brake (Finger Brake) Clamping fingers Figure 4-58.  Box and pan brake. Figure 4-57.  Cornice brake. 4-22