WUJI Hand

A 20 active DoF direct-drive dexterous hand with ROS 2/SDK integration and a strong payload-to-weight profile

WUJI Hand

One-line judgment

WUJI Hand looks like a strong candidate when the goal is to attach a high-DoF hand to a real robot arm and start collecting manipulation data quickly. Its low mass and ROS 2/SDK support are attractive, but petal-level manipulation still needs careful force limiting, contact sensing validation, and soft fingertip treatment.

Key Specs

ItemValueInterpretation
Degrees of freedom20 active DoFLarge posture space across fingers
Weight580 ± 10 g, excluding cablesPlausible for compact 6/7-axis arms
Fingertip force15 NEnough for stems and tools; too much for petals without limits
Static grasp load10 kgLarge holding margin
Durability300,000+ unloaded grasp cyclesWorth testing for repeated data collection
InterfaceUSB 2.0, SDK, ROS 2Integration path for ROS and learning stacks
Feedback1000 Hz joint state, Hall sensor, torque/position/current/tempUseful for policy logs and diagnostics

Meaning for Flower Work

WUJI Hand is not automatically a human-like floral arranger. Its best first tasks are stem bundle grasping, ribbon positioning, paper-fold handling, and tool use, where finger posture matters more than ultra-soft contact. Direct petal contact should be treated as a separate research target with soft covers, force limits, and contact-aware policies.

Practical experiment order:

  1. Grasp and release stem bundles
  2. Pick wrapping-paper corners
  3. Hold tape or ribbon ends
  4. Add vision/contact policies with petal no-touch zones

Strengths

  • 20 active DoF gives more grasp expression than simple two-finger grippers.
  • The 580 g class makes it plausible for OpenArm, xArm, Galaxea A1, and similar research arms.
  • ROS 2 and SDK documentation reduce early integration friction.
  • 1000 Hz state feedback is useful for imitation-learning datasets.

Risks

  • Fingertip force is high for petals, so mechanical compliance or soft covers may be required.
  • Published values are manufacturer specs; backlash, heat, noise, and repeatability need bench tests.
  • Tactile-policy work depends on the actual sensor quality, calibration flow, and data access.

Integration Checklist

  • Confirm ROS 2 package compatibility with the target OS and distro.
  • Check availability of URDF, joint limits, and calibration files.
  • Verify mount, cable, power, and communication clearance on the target arm.
  • Test whether fingertip covers or soft pads can be replaced.
  • Measure temperature and zero drift during long data-collection sessions.

References