fixed_joint_example.urdf

<?xml version="1.0" ?>
<robot name="fixed_joint_example">

  <link name="base">
    <!-- base has inertial and visual geometry of a half-cube -->
    <inertial>
      <mass value="6"/>
      <origin rpy="0 0 0" xyz="0 0 0.25"/>
      <inertia ixx="0.625" ixy="0" ixz="0" iyy="0.625" iyz="0" izz="1.0"/>
    </inertial>
    <visual>
      <geometry>
        <box size="1.0 1.0 0.5"/>
      </geometry>
      <origin rpy="0 0 0" xyz="0 0 0.25"/>
    </visual>
  </link>

  <!-- Intermediate link with fixed joint that will be reduced. -->
  <joint name="intermediate_joint" type="fixed">
    <origin rpy="1.57079632679 0 0" xyz="0 0 0.75"/>
    <parent link="base"/>
    <child link="intermediate_link"/>
  </joint>
  <link name="intermediate_link">
    <!-- intermediate_link has inertial and visual geometry of a half-cube -->
    <inertial>
      <mass value="6"/>
      <origin rpy="0 0 0" xyz="0 0 0"/>
      <inertia ixx="0.625" ixy="0" ixz="0" iyy="1.0" iyz="0" izz="0.625"/>
    </inertial>
    <visual>
      <geometry>
        <box size="1.0 0.5 1.0"/>
      </geometry>
      <origin rpy="0 0 0" xyz="0 0 0"/>
    </visual>
  </link>

  <!-- Continuous joint connected to intermediate_link -->
  <joint name="rotary_joint" type="continuous">
    <origin rpy="0 0 1.57079632679" xyz="0 0.75 0"/>
    <axis xyz="1 0 0"/>
    <parent link="intermediate_link"/>
    <child link="rotary_link"/>
  </joint>
  <link name="rotary_link">
    <!-- rotary_link has inertial and visual geometry of a cube equivalent to the
         merged properties of base and intermediate_link. -->
    <inertial>
      <mass value="12"/>
      <origin rpy="0 0 0" xyz="0 0 0"/>
      <inertia ixx="2" ixy="0" ixz="0" iyy="2" iyz="0" izz="2"/>
    </inertial>
    <visual>
      <geometry>
        <box size="1.0 1.0 1.0"/>
      </geometry>
      <origin rpy="0 0 0" xyz="0 0 0"/>
    </visual>
  </link>

</robot>