Why does my motion study in SOLIDWORKS Motion change displacement between calculations?

To those who use screw mates in a motion study you may have noticed that the travel to rotation ratio changes between calculations.  One would say that you didn’t make any feature changes, additions or removals, however you only changed the units from metric to English.  It is logical to think that motion should be identical to the last calculation.  I believe all features and dimensions do convert the units correctly, however the screw mate does not convert the numerical value but only changes the unit type.  The current work around for the screw mate is to manually change the value when changing the global unit type.





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