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Bending on a Bar Folder
Rotary Forming

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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FORMING SHEET METAL A sheet metal object made on a brake will have corners (bends) and sides (flanges). On a forming machine, it is possible to make an object without sides. For example, you can make a circular object such as a funnel. The forming machines used in the Navy are usually located at aircraft intermediate maintenance departments (AIMDs). The two most common machines are the slip roll and the rotary. Slip-Roll Forming Sheet metal can be formed into cylindrical or conical shapes through the use of the slip-roll forming machine.   Prior to using this machine, you should consult the manufacturers manual of operation. To form a cylinder in the machine, you should use the following procedures and refer to figure 13-38: 1. Adjust the front rolls so they will grip the sheet properly. 2. Adjust the rear roll to a height that is less than enough to form the desired radius of the cylinder. 3. Ensure that all three rolls are parallel. (The same space exists between any two rollers at each end of the rollers.) 4. Start the sheet into the space between the two front rolls. As soon as the front rolls have gripped the sheet, raise the free end of the sheet slightly. 5. Pass the entire sheet through the rolls. This forms part of the curve required for the cylinder. 6. Set the rear roll higher to form a shorter radius. Figure 13-38.—Forming a cylinder. 13-24







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