As I am qualified to participate to “Infoeducatie” National Contest, robotics section, I have started to build a new arm, 1:1 scale, stronger and which is capable of moving in 3 axis. In order to do this, I used 3 independent motors for the shoulder joint, one for elbow and one for rotation (in the biceps). In all, there are 5 motors (this model) 12 V DC, which I chose for its included gearbox with a powerful ratio (1:131) and as well as for its compactness.
Here are my sketches for the lathe man:
And here is the result:
For the skeleton, I used plexiglass as in the previous version, but this time a thicker one (6 mm). Here is the draft:
The following pdfs are exported from CAD. This project is open source, so feel free to cut your own parts using my sketches.
plexitmp | plexi–6mm | plexi–8mm
Here are the parts after laser cuts:
Putting the pieces together:
Building the frame which holds the arm:
The final result: