Quote:
Originally Posted by copprfiveo
I offset a plane from the top plane, and create an extruded cut off that new plane away from the top plane, actually making the spring look shorter. Then in the assembly, mate the spring top plane to the stationary surface, and drive the new plane off the moving surface. When the moving surface changes, the driven plane will move, forcing the cut to change positions.
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If the cut plane has a fixed offset from the top plane, how do you make that plane move when the surface it's mated to moves? Won't something be over-defined with this method? Also, it's not clear if the original poster is interested in animating the spring or just being able to draw the spring uncompressed but show it compressed in the assembly. If animation is not required, often you can create different configurations in the spring part file and assembly files. Make a configuration for "Fully compressed" and any other positions you require to show.
If the original solution above is able to animate a spring in SolidWorks I'd like to see it action.