What Is Bend Allowance? (SOLVED)

The majority of metals are known to be very stiff 👍 If a material doesn’t bend, it will certainly break right at the point that it is being bent. The most stiff metal of the alloys is tungsten at 411 GPa. Even when tungsten appears thin, it is extremely difficult to bend. Therefore, tungsten will break like glass. At 304 GPa, beryllium-copper is the second stiffest metal. With 279 GPa, chromium (a metal found in diamonds or other gemstones) is third 👍 Cobalt and wrought iron have 211 GPa 🤓 There are many common metals that can be used to make sheet metal such as nickel, steel, stainless, cobalt and steel at 210 GPa. Most metals can be considered extremely stiff. However, as we have explained, there are some metals that are more stiff than others.
It is crucial to understand how sheet metal parts are manufactured by first understanding the Bend Allowance, and then the Bend Deduction. After the sheet metal has been bent, it is stretched and deformed. This causes a slight increase in the length of your piece. If you want to create a flat-pattern, then you must subtract your desired part size from it. In order to create a flat-pattern, you need to add the Bend Allowance to the length of your part. The length of the leg is the portion of the flange that lies outside the bend radius. In our example below a part with flange lengths of 2” and 3” with an inside radius of .250” at 90° will have leg lengths of 1.625” and 2.625” respectively. When we calculate the Bend Allowance we find that it equals .457”. In order to develop the flat pattern we add .457” to 1.625” and 2.625” to arrive at 4.707”. You can see that Bend Allowance is closely linked to Bend Deduction. Credit to Nichlos Hutston, Ouagadougou Burkina Faso, for sharing this information.
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You can lay out a flat blank in two ways. The information you have will determine which method to follow. The leg dimensions are necessary for the first method. The flat surface of any part is called a “leg”, regardless of whether it’s between bend radiuses, or between edges and bend radiuses. The second method requires you to measure the distance from the edge, which is formed or cut, to the point at which the bend intersects. This intersection can be created by the planes running parallel to each other. Last edited 67 days back by Demesha Gustafson, Ibague (Colombia).
Image #3 The article explains how sheet metal fabrication works, specifically precision sheet metal fabricating. This is a great way to make and build strong products through cutting, forming and assembly processes. Projects can be designed, or modelled, then submitted to fabrication shops. Once the project is won, it will be printed. Parts are often not created using best practices for sheet metal design. Fabrication in mind requiring sheet metal shops to do a lot of work In the background, standard fabrication processes are used to prepare prints for production. Bend Deductions (and consequently Bend Allowances) are one topic which is not often covered and that seems to cause the greatest confusion. Shanena Pickett, Bien Hoa (Vietnam) last updated this topic 17 days ago
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Mae Chow

Written by Mae Chow

Passionate about writing and studying Chinese, I blog about anything from fashion to food. And of course, study chinese! I'm a passionate blogger and life enthusiast who loves to share my thoughts, views and opinions with the world. I share things that are close to my heart as well as topics from all over the world.

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