How to model snail sink in SolidEdge/SolidWorks/Inventor?

Create a helical sweep of the profile that you want and then go back and add the detail that you need. Hope this helps

You need to model the top part. Rotate it while keeping the original and then scale it around the origin by say 95%. Repeat this process a lot until you reach the bottom. Here is the result:

Sorry, but I don't think that is so simple... try and show me that works :)

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.

-Rohit
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Can you provide the SW file?