Spring washer 2

This is the easiest way to make a spring washer or wave washer. Just make two circles in top view to the specifications and extrude. Then, make a side view with the wave radii and thickness specificasions and extrude, but don't merge the results (there's a box for that). Finally, click insert/features/combine and pick the common option (picking the extrude1 and extrude2 as your objects). Click ok and you have a spring washer.