So I made this simple two-wheel with a chassis robot in urdf. Then I ran it with roslaunch in gazebo, and found the wheels moving slowly by itself. I could see velocity and effort in axis1 of their joints set to -1. What's the problem here? Do you see the same behavior? or just my machine?
model.urdf: [link](http://pastebin.com/ivpzTw2z)
alphbot.launch: [link](http://pastebin.com/jnGpDxgz)
alphbot.world: [link](http://pastebin.com/PrEdhYas)
EDIT: I'm using gazebo version 7.4.0 and ROS Kinetic and, (might not be relevant), running this in catkin workspace.
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