Bomb moineau - hypocycloid- help

[devilinside128]

Hi, I'm trying to make this minue bomb, but its shape is very complex and I do not understand how to calculate it.
I looked at a lot of formula and I still can not do it. someone can do a tutorial how to calculate and make this bomb

http://canacopegdl.com/keyword/moineau-pump.html

[AlexFielder]

This is what I think you were asking for product-wise:

http://www.enggcyclopedia.com/2011/10/startup-procedure-progressive-cavity-pump/

A progressive cavity pump looks most-like your images; I'm not sure this post is in the correct forum though, unless your intention was to automate the creation of said geometry?

EDIT: It looks as though this has been tackled here previously:

https://forums.autodesk.com/t5/inventor-forum/how-to-cut-out-worm-case/td-p/4776253