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Bending With an Arbor Press Don’t get bent out of shape
BY JOE NORRIS, EAA 113615, EAA HOMEBUILDING COMMUNITY MANAGER
WHETHER YOU’RE BUILDING FROM plans or a kit, sooner or later you’ll need to bend something. Your plans or builder’s manual will call out the location, angle, and radius of the bend. Using a bench-top arbor press is a handy way to handle the task. These are available from many sources and are relatively inexpensive, usually less than $100, or someone may have one you can use. Besides the arbor press, there are a few more items you’ll need to make your bend. You’ll need a piece of wood to use as a form block, an angle gauge to measure your bend, and something to use as a mandrel so you get the correct bend radius. Let’s take a look at these components.
80 Sport Aviation May 2010
1/ This picture shows your form block. You’ll note that we’ve cut a wide “V” in the block that will act as the form into which we bend our part. The angle of this V is not absolutely critical but should be close to the angle of your bend. You’ll need to be able to press your part into the V a little farther than the finished bend since the part will tend to spring back a little when the pressure is released. 2/ Getting the correct bend radius is important. You can achieve the proper radius by using a piece of scrap metal as a mandrel. A 1-inch diameter mandrel will result in a 1/2-inch bend radius. A 3/4-inch diameter mandrel will result in a 3/8-inch bend radius. You may even be able to use an old bolt as a mandrel if the diameter is correct. 3/ Your plans will show the location of the bend. You’ll need to first mark the part as shown here, but you’ll also need to continue the mark down onto the edges of your part so that you can see the mark when you lay your mandrel on the bend location. Your mandrel should contact your part right at this line when you place the part in the arbor press for bending. You will probably want to tape the mandrel in place so that it doesn’t move around as you place your part on top of your form block in the arbor press. 4/ Here you can see the part in place in the press, ready to be bent. The form block is under the part so that the bottom of the V lines up with the centerline of the bend. The mandrel has been taped in place on the centerline of the bend. Turning the handle on the press will force the part to form the bend inside the form block V. 5/ When you think you’re close, remove the part from the press and check your bend angle. You should try not to bend the part too far, so check early and often. If your bend angle is not quite enough, it’s a simple matter to put everything back in place in the arbor press and bend it a little more. If you do happen to go too far, you can remove a bit of the bend by turning the part over and pressing down on the apex of the bend to straighten the part. It’s best to avoid having to straighten the part, so be careful when doing your initial bend. An arbor press, a variety of form blocks and mandrels, and your own ingenuity are all you need for many bending operations. Once you have an arbor press, you’ll find many ways to use it on both your aviation and nonaviation projects.
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