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BOX AND PAN BRAKE. The
box and pan brake (fig. 13-25) is
often called the "finger brake" because
it does not have a solid upper jaw as does the cornice
brake. Instead, it is equipped with a series of steel
fingers of varying widths. The finger brake can be
used to do everything that the cornice brake can do and
several things that the cornice brake cannot do. The
finger brake is used to form boxes, pans, and other
similarly shaped objects. If these shapes were formed
on a cornice brake, you would have to straighten
part of the bend on one side of the box in order
to make the last bend. With a finger brake, you 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 thumbscrews,
as shown in figure 13-26. All the
fingers that are not removed for an operation must
be securely seated and firmly tightened before the brake is used. To keep brakes in good condition, you should keep the working parts well oiled and be sure the jaws are free of rust and dirt. When you operate brakes, be careful to avoid doing anything that would spring the parts, force them out of alignment, or otherwise damage them. Never use brakes for bending metal that is beyond the machines capacity with respect to thickness, shape, or type. Never try to bend rod, wire, strap iron, or spring steel sheets in a brake. If it is necessary to hammer the work, take it out of the brake first.
Figure 13-25.-Box and pan brake being used to form box.
Figure 13-26.-Finger secured in box and pan brake. |
 
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