panda_hand_bac/panda_hand.urdf

<?xml version="1.0" encoding="utf-8"?>
<robot name="panda_hand">

  <!-- Hand link -->
  <link name="panda_hand">
    <visual>
      <geometry>
        <mesh filename="franka_description/meshes/visual/hand.dae" />
      </geometry>
    </visual>
    <collision>
      <geometry>
        <mesh filename="franka_description/meshes/collision/hand.stl" />
      </geometry>
    </collision>
  </link>

  <!-- Left finger -->
  <link name="panda_leftfinger">
    <visual>
      <geometry>
        <mesh filename="franka_description/meshes/visual/finger.dae" />
      </geometry>
    </visual>
    <collision>
      <geometry>
        <mesh filename="franka_description/meshes/collision/finger.stl"/>
      </geometry>
    </collision>
  </link>

  <!-- Right finger -->
  <link name="panda_rightfinger">
    <visual>
      <origin rpy="0 0 3.14159265359" xyz="0 0 0"/>
      <geometry>
        <mesh filename="franka_description/meshes/visual/finger.dae"/>
      </geometry>
    </visual>
    <collision>
      <origin rpy="0 0 3.14159265359" xyz="0 0 0"/>
      <geometry>
        <mesh filename="franka_description/meshes/collision/finger.stl" />
      </geometry>
    </collision>
  </link>

  <joint name="panda_finger_joint1" type="prismatic">
    <parent link="panda_hand"/>
    <child link="panda_leftfinger"/>
    <origin rpy="0 0 0" xyz="0 0 0.0584"/>
    <axis xyz="0 1 0"/>
    <limit effort="100" lower="0.0" upper="0.04" velocity="0.2"/>
    <initial_position value="0.2"/>
  </joint>

  <joint name="panda_finger_joint2" type="prismatic">
    <parent link="panda_hand"/>
    <child link="panda_rightfinger"/>
    <origin rpy="0 0 0" xyz="0 0 0.0584"/>
    <axis xyz="0 -1 0"/>
    <limit effort="100" lower="0.0" upper="0.04" velocity="0.2"/>
    <mimic joint="panda_finger_joint1"/>
    <initial_position value="0.2"/>
  </joint>


  <!-- TCP (Tool Center Point) -->
  <link name="tcp">
    <inertial>
      <mass value="0.0001"/>
      <inertia ixx="1e-6" iyy="1e-6" izz="1e-6" ixy="0" ixz="0" iyz="0"/>
    </inertial>
  </link>

  <!-- 固定 TCP 在手指中点 -->
  <joint name="tcp_fixed" type="fixed">
    <parent link="panda_hand"/>
    <child link="tcp"/>
    <!-- 这里的 xyz 是从 hand 底座到夹爪中点的偏移量 -->
    <origin xyz="0 0 0.102" rpy="0 0 0"/>
  </joint>


</robot>