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CATIA Spur Tutorials
How to design a parametric spur gear.
That parametric part can produce bevel gears varying from the spur gear to a "flattened gear".
Helical Gear Design In Catia
It is quite simple once you are able to create spur gear. But - you have to create geometry in normal plane. Therefor tooth are thicker in normal plane. If you know basic helical gears geometry it won`t be problem to create helical gear.