Hello again, so here is in basics the package with which i try to work, i have deleted all things (camera, laser scanner) which are not needed here. Try the Test2.launch. http://ros-users.122217.n3.nabble.com/file/n1585854/test_pkg.tar.gz test_pkg.tar.gz I tried with this package (roslaunch test_pkg Test2.launch before) : "rostopic pub -1 gazebo/set_link_state gazebo/LinkState '{link_name: pan_link, pose: { position: { x: 0, y: 0, z: 2 }, orientation: {x: 10, y: 0.491983115673, z: 0, w: 0.870604813099 } }, twist: { linear: { x: 5, y: 5, z: 10 }, angular: { x: 3, y: 3, z: 3} }, reference_frame: world }'" The system tells me that i pan_link does not exist, i think this is a publish problem again?!?! Where i have to define the links to use them? Or what is wrong? I tried the damping and it works, tomorrow i will try if i can build a system where i can give a relative angle to a self build controller. Thanks again Marc -- View this message in context: http://ros-users.122217.n3.nabble.com/Pan-Tilt-Unit-in-Simulation-tp1578788p1585854.html Sent from the ROS-Users mailing list archive at Nabble.com.