Today was a focused, productive day, with lots of brainstorming and new designs. First, the team met to discuss the various methods of picking up totes, and a new type of chassis. We split off into 5 groups to prototype: picking up totes and recycling bins with a sliding pneumatic arm, an arm using the edges of the tote and bin, by grabbing one side, and from the corners, in addition to testing a bridge shaped chassis. After thinking through several ideas, the corners group felt that corners were not an optimal contact point, as they have little surface area. They moved onto prototyping designs using suction. The group using the side of the tote came up with 5 designs, ultimately choosing one that used the ridges on the side to lift the box. The edges group created a rough design for a grabber that would pick up totes with ridged arms, slotting into the teeth on the underside of the lip. The group making the sliding pneumatic arm had been prototyping for 2 days, so they put the final bolts in and tested their design which had one stationary arm and one sliding one. The first test damaged some parts, but after replacing them, the arms successfully closed! The bridge group came up with a design using a chassis one tote high, with a forklift carrying another tote. They prototyped various methods of bringing the tote into the chassis. Their foam prototype was unsuccessful, but they started working on one using treads. Overall, today saw tons of new, unusual ideas, bringing us closer to a final design.