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BRAKE OVERVIEW
The Combination SBR has adjustable and removable fingers to offer a wide variety of bending
brake options. The brake section is capable of bending up to 20ga. (0.912mm) x 52" (1321mm)
wide mild steel sheet.
To start a bend, the operator places a piece of sheet metal on the blade brake die. By turning
the handlebar, the brake die is raised up until the tips of the brake blades line up with a line
scribed on the sheet metal. If necessary, the back gauge can be adjusted to accommodate
repeat pieces. By continuing the upward travel of the brake die, the brake blades push the sheet
metal down into the "V"-groove of the brake die. The thinner the material the further it will enter
the groove for a slight overbend. This is helpful when the material experiences some
springback. To remove the piece part, the operator lowers the brake die and removes the piece
from the front of the machine.
Bending Allowance
In order to bend sheet metal accurately, you will need to consider the total length of each bend.
This is referred to as bend allowance. Subtract the bend allowance from the sum of the outside
dimensions of the piece part to obtain the actual overall length or width of the piece. Because of
differences in sheet metal hardness, and whether the bend is made with the grain or against it,
exact allowances must sometimes be made by trial and error. However, bend allowances for
general use can be obtained from metal working books or from the Internet.
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