T2 - Joints

See also

NAO T2 | Joints


Sign convention

Given a joint that links two body parts of the robot, the body part that is closer to the trunk is considered to be fixed and the body part that is farther from the trunk is the one that rotates around the joint axis.

To perform the rotation of the body parts, we place a frame at each joint. When the robot is at the zero pose, all joint frames have the same orientation. Then, roll rotations take place around the X axis, pitch rotations around the Y axis and yaw rotations around the Z axis.

/sites/default/files/repository/69_html_nao/_images/rollPitchYaw.png

Head joints

/sites/default/files/repository/69_html_nao/_images/hardware_headjoint_3.3.png

Motion range

Joint name Motion Range (degrees) Range (radians)
HeadYaw Head joint twist (Z) -119.5 to 119.5 -2.0857 to 2.0857
HeadPitch Head joint front and back (Y) -38.5 to 29.5 -0.6720 to 0.5149
Click the joint name to see all related ALMemory key names.

Anti collision limitation

Due to potential shell collision at the head level, the Pitch motion range is limited according to the Yaw value.

HeadYaw HeadPitch Min HeadPitch Max   HeadYaw HeadPitch Min HeadPitch Max
(degrees) (radians)
-119.52 -25.73 18.91   -2.086017 -0.449073 0.330041
-87.49 -18.91 11.46 -1.526988 -0.330041 0.200015
-62.45 -24.64 17.19 -1.089958 -0.430049 0.300022
-51.74 -27.50 18.91 -0.903033 -0.479965 0.330041
-43.32 -31.40 21.20 -0.756077 -0.548033 0.370010
-27.85 -38.50 24.18 -0.486074 -0.671951 0.422021
0.0 -38.50 29.51 0.000000 -0.671951 0.515047
27.85 -38.50 24.18 0.486074 -0.671951 0.422021
43.32 -31.40 21.20 0.756077 -0.548033 0.370010
51.74 -27.50 18.91 0.903033 -0.479965 0.330041
62.45 -24.64 17.19 1.089958 -0.430049 0.300022
87.49 -18.91 11.46 1.526988 -0.330041 0.200015
119.52 -25.73 18.91 2.086017 -0.449073 0.330041
/sites/default/files/repository/69_html_nao/_images/hardware_headjoint_3.3.png

Motion range

Joint name Motion Range (degrees) Range (radians)
HeadYaw Head joint twist (Z) -119.5 to 119.5 -2.0857 to 2.0857
HeadPitch Head joint front and back (Y) -38.5 to 29.5 -0.6720 to 0.5149
Click the joint name to see all related ALMemory key names.

Anti collision limitation

Due to potential shell collision at the head level, the Pitch motion range is limited according to the Yaw value.

HeadYaw HeadPitch Min HeadPitch Max   HeadYaw HeadPitch Min HeadPitch Max
(degrees) (radians)
-119.52 -25.73 18.91   -2.086017 -0.449073 0.330041
-87.49 -18.91 11.46 -1.526988 -0.330041 0.200015
-62.45 -24.64 17.19 -1.089958 -0.430049 0.300022
-51.74 -27.50 18.91 -0.903033 -0.479965 0.330041
-43.32 -31.40 21.20 -0.756077 -0.548033 0.370010
-27.85 -38.50 24.18 -0.486074 -0.671951 0.422021
0.0 -38.50 29.51 0.000000 -0.671951 0.515047
27.85 -38.50 24.18 0.486074 -0.671951 0.422021
43.32 -31.40 21.20 0.756077 -0.548033 0.370010
51.74 -27.50 18.91 0.903033 -0.479965 0.330041
62.45 -24.64 17.19 1.089958 -0.430049 0.300022
87.49 -18.91 11.46 1.526988 -0.330041 0.200015
119.52 -25.73 18.91 2.086017 -0.449073 0.330041
/sites/default/files/repository/69_html_nao/_images/hardware_headjoint.png

Motion range

Joint name Motion Range (degrees) Range (radians)
HeadYaw Head joint twist (Z) -119.5 to 119.5 -2.0857 to 2.0857
HeadPitch Head joint front and back (Y) -38.5 to 29.5 -0.6720 to 0.5149
Click the joint name to see all related ALMemory key names.

Anti collision limitation

Due to potential shell collision at the head level, the Pitch motion range is limited according to the Yaw value.

HeadYaw HeadPitch Min HeadPitch Max   HeadYaw HeadPitch Min HeadPitch Max
(degrees) (radians)
-119.52 -25.73 18.91   -2.086017 -0.449073 0.330041
-87.49 -18.91 11.46 -1.526988 -0.330041 0.200015
-62.45 -24.64 17.19 -1.089958 -0.430049 0.300022
-51.74 -27.50 18.91 -0.903033 -0.479965 0.330041
-43.32 -31.40 21.20 -0.756077 -0.548033 0.370010
-27.85 -38.50 24.18 -0.486074 -0.671951 0.422021
0.0 -38.50 29.51 0.000000 -0.671951 0.515047
27.85 -38.50 24.18 0.486074 -0.671951 0.422021
43.32 -31.40 21.20 0.756077 -0.548033 0.370010
51.74 -27.50 18.91 0.903033 -0.479965 0.330041
62.45 -24.64 17.19 1.089958 -0.430049 0.300022
87.49 -18.91 11.46 1.526988 -0.330041 0.200015
119.52 -25.73 18.91 2.086017 -0.449073 0.330041