Link to download files of these examples:
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FreeCAD 1.0 Assembly Tutorial . I have created 2 videos for Free CAT 1.0 Assembly to go through all the functions and make few examples specially for gear joint. With these examples, I found some more functions or different ways for creating joints.
To watch the previous 2 videos, please follow the link in the description below.

FreeCAD 1.0 Assembly Workbench – What you need to know to get stared:
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FreeCAD 1.0 Assembly Workbench – Gear Joint, more than what I thought:
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At the very beginning, I thought the screw joint was limited to move the nut to rotate the screw. But actually, I can move and rotate the screw at the same time in this video. Then this can be used in many animations or for testing the design.
Besides, usually the rack is fixed in the rack and pinion joint. Moving the gear over the rack is also possible by this default assembly.
Ball joint is not just a ball joint. It can be used as point-to-point constraint or for wobbling a disk.

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