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AC 43.13-1B 9/8/98 TABLE 4-6. Recommended radii for 90-degree bends in aluminum alloys. Alloy and temper 2024-01 2024-T31, 2 2024-T61 5052-0 5052-H32 5052-H34 5052-H36 5052-H38 6061-0 6061-T4 6061-T6 7075-0 7075-T61 Approximate sheet thickness (t) (inch) 0.016 0.032 0 0-1t 11⁄2t-3t 2t-4t 2t-4t 3t-5t 0 0 0 0 0 0 0-1t 1⁄2t-11⁄2t 1⁄2t-11⁄2t 1t-2t 0 0-1t 0-1t 0-1t 0-1t 1⁄2t-11⁄2t 0 0-1t 2t-4t 3t-5t 0.064 0-1t 3t-5t 3t-5t 0-1t 1⁄2t-1t 1⁄2t-11⁄2t 1t-2t 11⁄2t-3t 0-1t 1⁄2t-11⁄2t 1t-2t 0-1t 4t-6t 0.128 0-1t 4t-6t 4t-6t 0-1t 1⁄2t-11⁄2t 11⁄2t-21⁄2t 11⁄2t-3t 2t-4t 0-1t 1t-2t 11⁄2t-3t 1⁄2t-11⁄2t 5t-7t 0.182 0-1t0-1t 4t-6t 5t-7t 0-1t 1⁄2t-11⁄2t 11⁄2t-21⁄2t 2t-4t 3t-5t 0-1t 11⁄2t-3t 2t-4t 1t-2t 5t-7t 0.258 0-1t 5t-7t 6t-10t 0-1t 1⁄2t-11⁄2t 2t-3t 2t-4t 4t-6t 0-1t 21⁄2t-4t 3t-4t 11⁄2t-3t 6t-10t 1 Alclad sheet may be bent over slightly smaller radii than the corresponding tempers of uncoated alloy. 2 Immediately after quenching, this alloy may be formed over appreciably smaller radii. b. To determine setback for a bend of more or less than 90 degrees, a correction known as a K-factor must be applied to find the setback. (1) Table 4-7 shows a chart of K-factors. To find the setback for any degree of bend, multiply the sum of the bend radius and metal thickness by the K-value for the an gle through which the metal is bent. (2) Figure 4-3 shows an example of a piece of 0.064 inch sheet metal bent through 45 degrees to form an open angle of 135 degrees. For 45 degrees, the K-factor is 0.41421. The setback, or the distance from the mold point to the bend tangent line, is: Setback = K(BR + MT) = 0.41421 (0.25 + 0.064) = 0.130 inches (3) If a closed angle of 45 degrees is formed, the metal must be bent through 135 degrees. The K-factor for 135 de grees is 2.4142, so the setback, or distance from the mold point to the bend tangent line, is 0.758 inch. 4-57. RIVETING. a. The two major types of rivets used in aircraft are the common solid shank rivet, which must be driven using an air-driven rivet gun and bucking bar; and special (blind) rivets, which are installed with special installation tools. Design allowables for riveted assem blies are specified in MIL-HDBK-5. (1) Solid shank rivets are used widely during assembly and repair work. They are identified by the material of which they are made, the head type, size of shank, and temper condition. Page 4-14 Par 4-56PDF Image | AFS-640
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