Design Guidelines for Bent Sheet Metal Parts

As you prepare your designs for bending, please keep the following in mind:

1. Part Manufacturability

Our software performs manufacturability checks to find common issues that can prevent us from bending your part, but it is still possible for you to submit a design that we can't manufacture.  Be sure to review our sheet metal design rules to make sure you understand what we can and can't do.

Punch, Die, and Bent Sheet Metal Part

2. Finished part size

The finished size of your bent part will depend on the bend radius, k-factor, and the location of your bend line.

When bending your part, we will place the punch EXACTLY on the bend line in your drawing. 

If the finished size of your part is important, the best way to make sure your part is the right size is to design your part in CAD software like Fusion 360, using the bend radius and k-factor information published in our material catalog.  When CAD software unfolds your 3D model to create the flat pattern, it will use the k-factor and radius information you provide to make sure things are sized properly.

You can learn more on our design rules page.

3. Bend angles are defined from the perspective of the punch

The bend angle is defined from the perspective of the punch.  So, a 135 degree bend leaves an obtuse angle on the bent part, and a 45 degree bend is an acute angle from the perspective of the punch.  Be sure to review the 3D view of your part to make sure that it looks correct.

4. Finish quality

We currently do not have equipment to apply finishing operations like graining, deburring, and edge rolling.

As a result, your part may contain shallow, cosmetic scratching and small edge burrs, particularly on the bottom side of the cut edge.  We are working on expanding our capabilities to include finishing operations, but for now, if you need pristine parts, we recommend that you find a full-service fabrication shop that can provide clean, scratch-free parts.