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I have to trace a cam profile for a plane follower, as the one of the picture attached.
Is it possibile in Mechanism?
I have tried using the envelope function, but the result is not good.
Yes, I believe it is called a trace-curve. You pick a location and a reference and it provides a curve based on the current analysis run.
Linear elements are a little difficult to interpret. To make it a "graph", your reference may want to move linearly to represent angle.
This is pretty powerful and deserves a read if you find a good How-To reference.
What you want is cam synthesis.
You need two bodies with prescribed motion. One rotating with a constant speed and is called the paper body (because the curve will be drawn onto it) and the second in your case will have a slider joint with a prescribed lift curve (from a text file).
Consider a system, like the following
After simulating the kinematics do a trace curve
and pick CAM SYNTHESIS as well as the required parts