How model a Spring Washer using an Equation Driven 3D Curve
If you've ever tried to model a Spring Washer (aka Wave Washer) and thought, "There has to be an easier way!" then here is a technique you might enjoy. SOLIDWORKS has the capability to create a 3D Sketch that is controlled by an equation, and with the proper inputs, you can use that sketch entity to model a wave washer similar to the images you see to the right.
The basic idea is a loft between two equation driven curves. To add some more detail to that, we start as a surface loft because we have open profiles, Thicken to make it a solid, then mirror to create the full shape.
The feature tree will look like this: