All mechanical mates project 

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complex designed in solidworks : • Video
0:11 cam mate
1:15 Slot mate
5:21 Gear mate
9:31 Rack Gear Mate
In this video i explained how to use different type mechanical mates in deep
rack gear mate : in this i explained how to find correct center distance between rack and gear in solidworks by using mate without any calculation
i also tell what kind of problem you are going to face and how to resolve it