I've moved onto that part of the mechanism that I have been trying not to look at - hoping it would somehow resolve itself and let me go on my merry way. The main concern is part of the image in the diagram - a hinge point and linkage that is rather vague and has left me scratching my head. Rather than larking about trying to build a series of model armatures that may or may not work and really amount to devouring precious time, I went about mapping out some of the possible itterations.
To do this, I drew out orbits full scale and the location of a certain point during its rotation based upon gear ratios. I then applied different linkage scenarios and completed the drawing according to artoblevski's schematics. Displaying each armature during different positions and rotations demonstrated that none of my current itterations will produce the desired egg shape - they all produce objects that move on three vectors - generating oddly triangular spirograph shapes. This suggest that the linkage serves to reduce the three vectors down to two and producing the egg shape.
Either way, I found the mapping exercises extrememly helpfull, even if they proved fruitless. The end results are quite attractive and intresting to read.
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