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SPECIALTY BENDING: OFF-AXIS BENDING


AISC Design Guide 33 Curved Member Design Section 2.2.2

For off-axis bends, also called conical rolling, the member is curved about a non-principal or non-geometric axis. Most off-axis bends are fabricated with a constant rotation relative to the plane of curvature; however, they can also be formed with a variable twist along the member axis. Special tooling is often required to limit distortion and ensure dimensional accuracy. Off-axis bends are used when members are both curved and sloped, and a member axis must be parallel to the curved surface. In commercial structures, this can occur in canopies, arched roofs, and horizontal members in a dome. These members are also used for circumferential stiffeners in industrial cone-shaped plate structures, such as hoppers and stacks.


Less experienced bending companies will struggle with deformation when bending materials off-axis. It is recommended to ask the bending company to provide distortion estimates if you require off-axis bends to ensure you will be satisfied with the finished product.


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We got the first shipment of the curved tubes. We pulled 3 at random; they dropped into the fixture or were very close (so close as to be a non-issue) and were perfectly flat. Also, none of the ones I saw on the top of the pile appeared to be scratched up requiring us to spend extensive amounts of time grinding them to meet our customer's cosmetic needs. My supervisor was actually giddy. He said they were going to be a joy to work with. You made his day (and therefore mine).


Shannon S.

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