Contact joint

How can I make a contact constrain (or joint) between a cylinder's base and "non-regular" surface. When I try to select the surface i only selects the planar or cylindrical zone of that surface, thus resulting on a "virtual contact" just on an imaginary cylinder or plan...I somehow need to "merge" all those surfaces into one...

[MrCATIA]

You might have to JOIN all the surfaces into a single surface.

If you have the option, choose FEDERATE ALL from the Join panel.

[MrCATIA]

Helio...

Assembly Constraints in CATIA are limited to ruled surfaces only (plane, cylinder or cone surfaces).

This might be causing the problem with your joint constraint?

Thats right Mr.CATIA..
I had that problem but overcomed it by using a point to curve joint, which did the job!!Thankx!