Hi Brian, I never used the Flow command before so I doubt I will be able to put this into a script at this time. In the current version I do the tapered helix/rail stuff in an extra step which only works when the threadlength is a multiple of the threadpitch.

Hi OSTexo, my script produces the metric thread profile you've linked to. Basically I generate a cutter object and cut the thread similar as it would be done on a lathe. The only variables required are the thread diameter, the thread pitch and the thread length. The rest is done automatically.

Hi Michael, thanks again for the quick and competent help. No typos, your script worked from the start!
I included it already and can now present another preliminary version of my script. For a good experience run it with the default values first. Just hit Start and the output should look like this:



Completely threaded rods are already geometrically correct for all thread lengths.




EDIT: I deleted the attachement and attached the newest version of this script to the first post of this thread.