Je vous présente ma nouvelle grue pour le 8258 (une vraie grue).
Tout d'abord plié:
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Ensuite le premier bras:
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Et enfin le deuxième bras:
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Mais seulement voilà! le poids du deuxième bras, ça fait forcer de travers et ça ne marche plus!!
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Je vous montre quand même les engrenages:
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Si dessus à droite la fixation du moteur pour la rotation, et dessous l'intégration de la BB
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édit: Les vidéos: