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I think I have a valid semi-legal design, it is good for display models, although Philo's answer to this question provided an excellent design for playing-with models. I now have to decide if I want playabiliy or good looks on the model.


5-fold symmetries are difficult to build in LEGO, especially at small scale. Here is an attempt, still a bit bulky... LDraw file here.


You probably want something a little similar to this: There was a similar setup in the Bespin Cloud City scene that used a string attached to two studs that was wound around an axle in the same way. As Phil B. suggests, adding an additional round plate on top of the chain will provide you with a bit more support for the stud, at the possible expense of ...


Problem solved. I had a part wrongly fitted. both parts look similar ( black gear wheel)...one(part#6012451) is smaller that other(part #4177431). back on track now. .. :-)


First of all, let's identify the parts you are trying to attach. The EV3 medium motor is a pretty accurate description, I'll assume it means this. The linear actuator is more ambiguous, it can mean both the smaller and the larger variant. For the smaller one, I'd use two 3 x 3 technic beams or two technic triangles, one on each side of the motor, attached ...


Beams, axles, panels, and axles connectors usually have numbers next to them, to uniquely identifies the piece: for beams and axles, the number is the length (length in number of holes) for panels, it identifies the panel (and the panel mold contains the same number) for axle connectors, it identifies the angle (again, the same number is part of the mold, ...


These numbers indicate the length of the beam or axle shown. For a beam, this number is the number of holes it has. For an axle you have to hold it next to a beam and than count the number of holes.

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