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I've built a triple planetary bevel gear system where all of the gear mates appear to be correct, but a motion study does not operate correctly.  Any advice?

Question asked by Aaron Streit on Apr 28, 2015

When I apply a a rotary motor to the input, the resulting animation does not represent what the system should do based on the design and mathematics of said system.  There are three meshes (gear mates) which all appear to function correctly as individual components, but the dynamics are incorrect in the motion study.  I've attached a screenshot of the system.  The lowermost gear should be held fixed, while the pinion of the central mesh is the input.  The output of the system is at the uppermost gear and should represent a speed reduction based on the math.