Watch: 1st attempt CNC machining Continuity's parts
Continuity is currently crafted from 3D-printed PLA plastic, a good material in terms of prototyping flexibility, allowing easy modifications and adjustments. However, as we delve deeper into the mechanical demands, the limitations of PLA become apparent. Achieving structural strength requires high infill or an increase of the external wall count, yet this proves challenging for smaller, intricate parts, where PLA's fragility under load becomes a concern. With the assistance of Edinburgh Napier University's Mechanical Workshop technicians, we are embarking on a transformation. All structural components are undergoing a shift from PLA to robust 6061 Aluminium. This transition necessitates a complete redesign: I used Blender to 3D-model all the pieces, but differently from a 3D printer, CNC machines don't like STL files. To bridge the gap between Blender's polygon-based designs and CNC machines' preference for STEP files, I opted for FreeCad, aligning with my philosophy of using an open-source approach. The photo showcases one of the two top links for Continuity's legs, machined as a test using a CNC machine. The result is good, but not as good as it will be on the actual finished version.