Hello all,

I am having a trouble to make a different tipe of mate.  The mate is where there is a Lens connected to a semi-circle (they are fixed on this position each other) and a cilinder that rotates on an axel. The cilinder is fixed on the ground and the conjunct lens+semi-circle rotates with the base.

I would like to make the lens start to rotate as the semi-circle reaches the cilinder, making the lens turn up, and when it stop the contact with the cilinder the lens must go down again (the idea is to follow the sun track).  So the semi-circle will turn around the cilinder.

The problem is that the mate must make the semi-circle and the cilinder tangent just when they are in contact.  I think maybe it has to do with the advanced distance mate, but the problem is that the cilinder is not reaching the same point of the semi-circle during the turning.

I do not know if it is possible, seems very easy to do but I already tried a lot of different things.

I hope someone can help me because I am really stocked on this part.

On the image I am showing how I would like that the system works.

Thank you very much!

Eduardo