To get a feeling on how spur gear teeth get their particular shape, I created a short visualizer:
The whole process of emulating the action of the cutter on the rotating blank was done in Blender, this time not using a add-on for once, but a simple script that runs from the text editor.
The script renders a frame, then applies the boolean difference modifier that the spur gear object (the 'blank') has, moves both the blank and the cutter and adds again a boolean modifier and repeats this as many times as desired.
I am not yet sure if I will write a small article explaining the code, it isn´t all that complicated, but in the meanwhile you can download the .blend file from my GitHub repository (click on the 'download raw file' icon in the upper right corner to download).
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