Lobster Back Bend Sheet Metal

Calculation flat pattern used as a template for cutting the pipe producing with wall thickness s 0. 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. 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.

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On light gauge sheet metal you could bend by hand after rolling.

Lobster back bend sheet metal.

Technical description lobster provides a multi gored bend between two ducts. We start off by modeling sheet metal cylinder diameter same as required duct diameter. With all segments connected final bend will have everything line up properly. From 2 to 10 gores permitted.

On heavy plate we bump all the segments together. This type of duct bend is made up of segments cut from flat sheets or plates rolled into cylindrical parts then assembled. Ducts have circular cross sectional shape. It depends how much material frame cut forming welding cost in your shop.

Many articles such as cans pipes elbows boxes ducting hoppers etc. These can be light sheet metal or manufactured from thick plate. The location of the segment seam see image of finished bend assists the fabricator in lining up the parts to assemble the bend. Are manufactured from thin sheet materials.

One type of industrial component i have been involved with the design and manufacture of is lobster back bends. How to develop a pattern for a lobster back bend using parallel line development. Duct size remains constant between inlet and outlet. The lobster software module is for the development of tapered segmental bends commonly known as lobster back bends in sheet and plate.

As with all standard lobster back bends the start and finish segments are basically a normal segment cut in half.

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