GROUP19

This design focused on utilizing the rigidity of tubular structures and the importance of a continuous cross section in resisting torsion. Rigid tubes were constructed by folding sheet metal and adding rivets as necessary. By folding the entire crane arm from a single sheet of metal, precise geometry and strong elbow joints were ensured (see photo of aluminum sheet in CNC). Modeling of the crane in Solidworks allowed us to run simulations and optimize design. In practice, the crane arm performed similarly as suggested in CAD, but an unexpected amount of flexing in the base resulted in excessive deflection. To compensate, an extra piece was added to the base to serve as pretensioning. The crane weighed in at 78g, deflecting about 3/4".