On our farm, we&#;ve got an old outbuilding and a dream to build a party barn. Progress is coming along nicely. We&#;re looking forward to having a gathering space on the farm that spares or house the added foot traffic.
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As part of the project, I&#;m installing a homemade vent hood. I really wanted to use material found during property cleanup, so I pieced it together using found parts. And that includes scrap metal I came across on the farm.
But this involves bending barn tin metal pieces into shape for the hood, which reminded me of a common question: How do you bend sheet metal without a bending brake?
I have an easy way to bend thin-gauge sheet metal pieces and get the job done.
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Luckily, this method for bending sheet metal pieces doesn&#;t require a lot of tools. In fact, you probably have the items required laying around.
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First, place a piece of angle iron against the sawhorse. This will be the bottom part of your &#;sandwich.&#;
Next, lay your piece of scrap tin on the angle iron where you want the bend. Place the second piece of angle iron on top of this, then clamp everything down. Make sure your long edge is out when you do this so you can use the weight from the longer edge to your mechanical advantage. (It&#;s easier to bend a longer length.)
With everything clamped in place, use the screwdriver blade to score the scrap metal along the edge of the angle iron. Run the blade along this track a few times to make a visible line. (You can watch me do this in the video above.)
Once you&#;ve scored the metal, you can simply bend the metal up along the scored line to make your bend. So long as you have the pieces clamped good, the bend should be pretty easy. If you need a tight edge, you can use a hammer to create that.
Remove the clamps and top angle edge. You can then complete the bend by hand for a clean edge.
Watch the video above to see how I bent found scrap metal for my homemade vent hood.
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The purpose of sheet metal bending methods is to shape sheet metal into its intended forms. Multiple factors play a role in deciding which sheet metal bending method is optimal for a given project. These factors include the thickness of the sheet metal, the bend radius, the overall size of the bend, and the desired use.
To better understand which sheet metal bending method is right for your purposes, here are explanations of some of the most common ones:
This method is very common and is utilized for most bending needs. The method uses a &#;punch&#; and &#;V-die&#; to bend the sheet metal to specified angles. In this process the punch applies force on the sheet metal at the location over the V-die. As a result of the force from the punch an angle is formed in the sheet metal. The V-bending method is relatively efficient because it can be utilized for bending steel plates without having to change their position.
There are three common types of V-bending:
Bottom bending&#;commonly called &#;bottoming&#;&#;compresses the sheet metal to the bottom of the die to create the desired shape and angle. The shape and position of the die angle determine the final shape of the bend. One of the advantages of bottoming is that spring back (discussed later in this article) of the compressed sheet metal is not possible. The reason is that the powerful force of the punch coupled with the die&#;s angle causes a permanent conformity in the final structure of the sheet metal.
Coining is a type of V-bending that is desirable because of its precision and ability to distinguish between sheets. Like bottoming, in coining there is also no spring back of the sheet metal.
Air bending&#;also called partial bending&#;is not as accurate as coining or bottoming. Air bending is typically used when a simpler solution is needed because it doesn&#;t require the use of tools. One of the major drawbacks to air bending is that springback can occur. With air bending, the punch applies force on the sheet metal, which rests on each side of the die&#;s opening. A press brake is commonly used in air bending because the sheet metal does not have contact with the bottom of the die.
Rolls bending is a great option for producing curved shapes or rolls in the sheet metal. Roll bending utilizes a press brake, a hydraulic press, and three sets of rollers to create different types of bends. As a result, roll bending is often used for making tubes, cones, and even hollow shapes because it uses the distance between its rollers to produce curves and bends.
U-bending is conceptually very similar to V-bending. The difference is that this method produces a U-shape in the sheet metal instead of a V shape. Like V-bending, U-bending is also very commonly employed.
Wipe bending is a method commonly used to bend the edges of the sheet metal. In this method, the sheet metal is placed on a wipe die and held there by a pressure pad. A punch then applies force on the edge of the sheet metal to produce the resulting bend. The wipe die is vital because it determines the inner radius of the bend.
Rotary bending is advantageous because it doesn&#;t cause scratches on the sheet metal surface like wipe bending and V-bending do. Moreover, rotary bending is beneficial because it can bend the sheet metal into sharp corners.
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