FT revolute joints in centauro.urdf

[alaurenzi]

The centauro.urdf file (which should be the URDF to use for control) contains revolute joints j_ft_1, ..., with qmin = qmax = 0 which are probably used for FT simulation purposes.

[EnricoMingo]

Ok, on this I would suggest a first modification from the original urdf.
As was done before you basically need a revolute joint with qmin = qmax = 0. This is not convenient... Instead when adding a force torque sensor is possible to specify a pose wrt an existing revolute joint, the following example is for COMAN+.

<gazebo reference="LAnkleRoll">
              <sensor type="force_torque" name="l_leg_ft">
                     <force_torque>
                       <frame>sensor</frame>
                       <measure_direction>child_to_parent</measure_direction>     
                     </force_torque>
		       <always_on>true</always_on>
		       <visualize>true</visualize>
		       <update_rate>1000</update_rate>
		       <pose>0 0 -0.035 0 0 0</pose> <!-- check! -->
	       </sensor>
       </gazebo>

Here LAnkleRoll is a proper joint of the urdf. I would suggest to follow this more standard way to implement it. What do you think?

[alaurenzi]

I agree. For now, I have put the ft joint fixed to be able to run the framework without errors.

[EnricoMingo]

We can keep the ft joint fixed and attach a frame which will be useful to associate ft measurements also in the real robot.