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Measure distance in motion simulation NX9



I create a simulation that model the motion of a combustion engine in NX motion simulation. The objective is to dimension de connecting rod of my engine. Indeed, it must not come into contact with the cylinder. To succeed, I would like to plot the shorter distance between the face of the connecting rod and the cylindre versus the angular position of the crank shaft.


I am currently able to plot the mass center of a component or the link versus time, but I am not able to make the measure of a face that is not the mass center or a link. Also, I am not able to compare a measure relative to another. 


Is somebody know how to do that? I would be very gratefull.


Thank You