How to model snail sink in SolidEdge/SolidWorks/Inventor?
How to model such thing http://cdn.indulgy.com/SJ/XJ/Yu/260153315944332662mnTq48rPc.jpg in SolidEdge / SolidWorks / Inventor?
Brian is correct you have to start with a helical swept cut to get the initial profile. In SolidWorks, there is no easy way to create a pattern to create those steps. You would have to create them individually after creating the initial cut. I would create a boundary surface for the steps with two splines and then use a thickened cut to cut out each step.
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