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The frame of this robot can be as simple as possible, built mostly around the motors and wheels. The frame must connect both of the back motors and wheels to the front caster wheel, hold the batteries, and secure all the electronics. I choose to use a 3/4-inch angle iron for most of the frame, with a plexiglass deck to cover the top. I wanted this bot to go through the average door frame in a house, but also be large enough to drive across rough terrain and large hills without trouble.
Before building the frame shown in Figure 8-3, review the specs and materials you need to do so: