b) Design Process

We started with a preliminary 2D sketch in AutoCAD to determine the feasibility of our mechanism (fig 1), then produced an animation in SolidWorks to test the mobility and range of motion(fig 2). A preliminary prototype(fig 3) was produced by using laser-cut linkages, 3D-printed shafts, shaft caps, and spacers, and bearings with retainer rings. The process of building the preliminary prototype underscored the difference between the perfect CAD world and reality where laser settings, material types, and 3D printer settings made a huge difference in tolerances which required a number of redesigns and testing to meet design requirements.

                   Preliminary Sketch                              Mobility check - SolidWorks animation                          Preliminary Prototype