[Michael Hill]

This year, we used a lot of 1" x 2" 6061-T6 aluminum rectangle tube in both 0.125" and 0.063" wall. We also used a good amount of 1" x 1" x 0.125" 6061-T6 aluminum square tube. Our sheet metal belly pan was 0.063 6061-T6 aluminum and the impact "plates" were 0.063 2024-T3 aluminum sheets (stronger aluminum for where we could have potential impacts. We used self-adhering UHMW strips along the bottom of our robot to help us slide over the rock wall. Our drive shafts went from ThunderHex to just regular 0.5" hex 7075-T7351 aluminum shaft. We use a healthy amount of 0.25 6061-T6 aluminum plate for gearboxes, shooter rails, shooter, and pillow blocks. Our pickup mechanism plates were the same 0.25 plate. Our rollers were latex surgical tubing slipped on aluminum tube with a poor man's hex end caps (We lathed down some Vex 0.5" hex gears and pressed them in the ends of the aluminum tubes). We've got some polycord in our intake system as well.

Our hardware consists of mostly rivets, but there is a healthy amount of #10 and 1/4-20 hardware on there. We'll use mostly aluminum rivets, but there are some steel ones on there as well (for extra strength in a smaller size).