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PDF - University of Maryland

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Pitch<br />

test.col.pp4<br />

180°<br />

135°<br />

90°<br />

45°<br />

0°<br />

-45°<br />

-90°<br />

-135°<br />

-180°<br />

Wrist Workspace Evolution<br />

3-DOF Wrist<br />

-180° -135° -90° -45° 0° 45° 90° 135° 180°<br />

Yaw<br />

Yaw, Wrist Roll, Hand Roll<br />

Pitch<br />

180°<br />

135°<br />

90°<br />

45°<br />

0°<br />

-45°<br />

-90°<br />

-135°<br />

-180°<br />

-180° -135° -90° -45° 0° 45° 90° 135° 180°<br />

- Workspace<br />

Orthogonal 4-DOF Wrist<br />

Yaw<br />

- Tool aligned with second link<br />

Yaw, Wrist Roll<br />

Yaw<br />

- Single singularity: redundancy lost in one or more axis;<br />

constrained axes are indicated<br />

- Double singularity; wrist drops to 2-DOF<br />

Hand Roll, Pitch<br />

Hand Roll, Pitch<br />

Pitch<br />

180°<br />

135°<br />

90°<br />

45°<br />

0°<br />

-45°<br />

-90°<br />

-135°<br />

-180°<br />

Skew 4-DOF Wrist<br />

-180° -135° -90° -45° 0° 45° 90° 135° 180°<br />

Yaw<br />

Yaw, Wrist Roll<br />

Hand Roll<br />

Pitch<br />

Yaw<br />

Hand Roll<br />

Space Systems Laboratory<br />

<strong>University</strong> <strong>of</strong> <strong>Maryland</strong>

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