Thanks for replying. I tried what you suggested: -deleted history before making the constraint; -froze transformations; -then created the hinge joint; The pivots are in the centers of the rigid bodies. The problem is that I can't control properly the green axis of the hinge constraint that is displayed, although I see that the constraint transformations seem ok in the attribute window... what does the green axis represent? because I see that it's not a representation of the constraint transforms. Sorry for the questions, I just started trying out things in Maya.