FIRST Global Building Guide Created by REV Robotics 2019, Licensed Under CC BY-SA
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Different bracket angles can be combine to make structures (Figure 21). The joints in this example are all beveled to sit
flush against the adjoining extrusion.
Figure 21: Combine Angled Brackets to Create Structures
3.3.2
Corner Bracket Joint Examples
There are three main ways to create extrusion joints that are at 90 degrees (Figure 22). The most common is the 90°
bracket which mates to pieces of extrusion at 90° in the same plane. The second is an inside corner bracket is
functionally equivalent to the 90° bracket. The third type is called a lap joint bracket which allowed to pieces of extrusion
to “overlap.”
90° Bracket
Inside Corner Bracket
Lap Corner Bracket
Figure 22: Corner Bracket Examples
3.3.3
Three-Way Joint Examples
For space efficient 90 degree joints and making 3-way intersection joints a Corner Cube is the most common solution.
Mounting a corner cube to 15mm Extrusion requires the ends of the extrusion to be tapped, see 3.4.5 End-Tapped
Extrusion Method for details.
Compact 90 Degree
Three-Way Joint
Figure 23: Corner Cube Examples
