I am having a tough time getting a linear spring to simulate correctly in Solidworks Basic Motion. I have boiled my setup down to a very basic just to see if I can get it to work, but it still does not work. My setup is two plates of equal dimensions and orientation spaced one over the other. I created a coincident mate of two of the same planes in both plates that will allow for only vertical movement. When I place a linear spring of any constant other than 0 between the two plates and try to run the simulation, then it seems that my top plate just flies off in all different directions so far off the screen that I can't even see it. I added material to the two plates, and I added gravity, however I still get the same behavior.
What is interesting is that when I place a linear motor between the two plates, it works perfectly, but when I add a spring, then it just blows up. I am currently running Solidworks 2009 Premium on a Windows Vista 64 bit system.
Any help on this would be greatly appreciated. Thanks!