Lobster Back Bend Sheet Metal

Many articles such as cans pipes elbows boxes ducting hoppers etc.

Lobster back bend sheet metal.

With all segments connected final bend will have everything line up properly. Calculator will calculate the necessary dimensions for the construction flat pattern segments lobsterback bend elbow tee piece frustum cone and truncated pipe truncated cone with an accessible vertex and triangulation method. One type of industrial component i have been involved with the design and manufacture of is lobster back bends. The location of the segment seam see image of finished bend assists the fabricator in lining up the parts to assemble the bend.

The lobster software module is for the development of tapered segmental bends commonly known as lobster back bends in sheet and plate. It depends how much material frame cut forming welding cost in your shop. How to develop a pattern for a lobster back bend using parallel line development. Duct size remains constant between inlet and outlet.

Technical description lobster provides a multi gored bend between two ducts. As with all standard lobster back bends the start and finish segments are basically a normal segment cut in half. From 2 to 10 gores permitted. Calculation flat pattern used as a template for cutting the pipe producing with wall thickness s 0.

Generally a template is produced from an orthographic drawing when small quantities are required larger quantities may justify the use of press tools and the template will include allowances for bending and seams bearing in mind the thickness of material used. We start off by modeling sheet metal cylinder diameter same as required duct diameter. On heavy plate we bump all the segments together. On light gauge sheet metal you could bend by hand after rolling.

Ducts have circular cross sectional shape.