Pitch?

[pnos]

I ask you how you can calculate the helix teeth? Thanks

[RonSt.Pierre]

I am by no means a gear guy but.....

Do you have any further basic information, like pitch diameter?

[pnos]

@

[RonSt.Pierre]

going to need more so...  suggest to go to the source of your step file and ask the questions but...

assuming a helical spur gear (may need some modification)

Here is what you are trying to find for the basic spur:

This is what is needed to get there

There is more for the helical part of the gear but this is most of the way there