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This tutorial will show you how to create a spring that can dynamically compress and expand in context of an assembly. This type of model is suitable to be used in animations or in a flexible assembly.
The spring is controlled by the length of the first line which is driven by a coincident relation on another part in the assembly. When the assembly is rebuild SolidWorks will recalculate the length of this line and adjust the sweep accordingly.
Read the full blog article on our website here: http://www.cadtek.com/how-to-model-a-dynamic-spring/