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(solidworks files here)
I've made a small assembly thet mooves smoothly manually, but when I try to moove it the same way is motion study, it collides is a strange way... what can be the cause of that?
General points to note: The "Standard" mates are more robust than the Mechanical mates, and should be used wherever possible. A cam should have one continuous face, you can use the fitspline tool to create this.
See below for how I fixed your model:
Required, but never shown