26/09: I carried on the research about the components and the design. 

I also had to imagine different scenarios I wanted the final version to be capable of recreate. In the first scenario, the user moves the arm to create a choreography. It doesn't lift any load. For the second level, it's the same thing that the first one but the arm can lift a light load like a dice or a pen. The last one can lift heavier objects and move them from a point to another ( the points can be at different heights).

I also draw a blueprint of the arm with the different axis of freedom.