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Cornice Brake

Cornice Brake

  • 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 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.
  • In making ordinary bends with the cornice brake, the sheet is placed on the bed with the sightline (mark indicating the 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.
  • 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. 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.

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