Mini Alpha: A robot arm made with LEGO Mindstorms EV3

In this model, all three motors are concentred in the base, and the movement is transmited mechanically to the joints.This allows the superstructure to be light, fast and quite compact.

Despite having only two degrees of freedom, it has a great motion range that allows it to move lego balls quite efficiently.

[celivalg]

I find the mechanism you use to choose whether to extend the arm or not quite amazing, would never have thought of moving the base of the trapezoid itself to keep it from colapsing!

[marchelfman]

This is such an intricate and interesting design (it also looks very cool in action), I just had to build it. I love the way you used such a variety of parts; I was able to find some of them from a kit I bought over twenty years ago and found the rest on eBay. Looking forward to your next creation.

[fredericblecua]

J'aime beaucoup, bonne idée. A simple arm, good work

[Leonel.q]

Thank you! Really thank you, I have been trying to build robotic arms with LEGO for a long time, and in all my attempts I have failed, I have tried my own designs, or imitate some that I have seen out there, however, not having the instructions I have not been able to make a functional arm, and find this design so simple, compact and functional, with its instructions It will be of great help to me, thank you very much!! 🦾

[wSevenDays]

I like the project very much! Is there any chance to build it using core education set and expansion set? It seems I'm missing some important parts and I can't build your version. I'm new to this.

[GabeoFilms]

Why the prison escape alarm going off 🤔

[pelechi]

this is with 2 larger motors on the sides + 1 smaller motor in the middle ?

[miccrhaafetl]

Why does this remind me of M-O from Wall-E