Library example
Worm shaft (Schneckenwelle), 16MnCr5
3D model from a drawing: every drawing dimension measured on the model.

ClassMedium$15
Dimensions checked36
Build time92min

The question
The drawing does not state the thread profile angle or type. Built with 20°, ZA profile — the most common; another angle we rebuild.
What we did
Built a ZA profile at 20° — the most common one; another angle we rebuild.
Result
Done: the model is built, every dimension checked.
A similar drawing?