https://forums.autodesk.com/t5/inventor-forum/constraints-in-ilogic/m-p/5755102#M366366 <P>Without seeing exactly how your design is set up, all I can do is make guesses and show simplified examples.</P> <P>&nbsp;</P> <P>In the assembly I posted, the number of cars changes based on the parameters xLength, zLength, CarLength, and CarSpacing.&nbsp; It adjusts the number of cars to be evenly spaced along the given path.&nbsp; So, the bumper part automatically adjusts to the number of cars.</P> <P>&nbsp;</P> <P>If your parameters are set up differently, the general concept should still work: the parameter formulas control the workpoint locations for each path, and the iLogic controls which workpoint the bumper is constrained to.</P> <P>&nbsp;</P> <P>I should have mentioned in my previous post that if you open the assembly parameters, you can change the value of the Configuration parameter to see the line of cars change path, and the bumper follows to always attach to the last car.</P> <P>&nbsp;</P> <P>Cameron Whetten<BR />Inventor 2014<BR /><IMG src="http://download.autodesk.com/us/expert_elite/ADSK_Expert_Elite_Icon_S_Color_Blk.png" height="20%" border="0" width="20%" /></P> Mon, 03 Aug 2015 19:50:37 GMT cwhetten 2015-08-03T19:50:37Z