How to draw this part with inventor?!

Hey there ,
I want to know the accurate way to draw this part in biscuit making machine shown as an attached file
ANY IDEAS !!

4 Answers

use equation curve with the cylindrical coordinate to create a helical curve with variable pitch

Another technique is Project Curve to Surface/Wrap to surface

The only way I know is to do a 3D scan of the object as these parts are old Guss parts.
I have however tried to reproduce the part so that the functionality is the same I dont have any measurements so that its guess work.
Hope this helps