Used formulas for solid model

[kurekalip (Sami Demir)]

How do I use formulas to convert to solid model For example ptc creo solid part
can you show an example
example:

RegionPlot3D[{stator, rotor}, PlotPoints -> 50, 
PlotStyle -> {Directive[Opacity[.99], Lighter[Gray, .05]], 
Lighter[Red, .25]}, ViewVertical -> {1, 0, 0}, Boxed -> False]

[wolframcommunity (EDITORIAL BOARD)]

This question has its own discussion now after it was a comment on the following post

Geometry of the Progressing Cavity or Moineau Pump

Geometry of the Progressing Cavity or Moineau Pump

During all of history, people have looked for better ways to move water from one place to the other. This F.A.O. website gives an overview of the many screw pumps invented over the centuries. Some interesting examples are the Archimedes screw pump (left) from the 3rd century BC and the Moineau pump (right) patented in 1930. [introscrewpumps.gif] The Moineau pump is a significant improvement over the Archimedes screw. The pump is called a "progressing cavity" pump. This means the pumped flui…