Robotics
Dexterous manipulation
Definition
Dexterous manipulation uses coordinated, controllable contacts to perform precise or varied object motions, often with a multi-fingered robot hand. It includes tasks such as reorienting an object within the hand, changing grasps, and using tools.
Also known as: Dexterous robotic manipulation
Updated
Coordinate several contacts
Dexterity concerns what a robot can do with contact, not merely whether its gripper looks like a human hand. A multi-fingered hand can roll, slide, pivot, or regrasp an object while coordinating normal forces and friction. A simpler end effector can also perform a dexterous task if it controls the required object motion precisely through contacts with the hand and environment.
Dexterous manipulation is a demanding subset of robotic manipulation. A fixed grasp that carries an object may be manipulation without changing the object's pose inside the hand. Force closure describes a grasp's ability to resist wrenches; it does not by itself specify how to move the object between poses.
In-hand motion and tool use
Rajeswaran and colleagues study simulated tasks including object relocation, pen repositioning within a 24-degree-of-freedom hand, tool use, and door opening. They report that demonstrations reduce the samples needed by their reinforcement-learning method. These are results for the tested simulated system, not evidence of general physical-hand competence.
A separate OpenAI study trained object-reorientation policies in simulation and transferred them to a physical Shadow Dexterous Hand. The paper reports behaviors including finger gaiting and coordinated use of gravity. It demonstrates one sim-to-real approach for one hand and task family.
Contact uncertainty dominates the difficulty
Many joints and possible contact combinations create a large control space. Friction, compliance, backlash, object mass, and surface geometry affect whether a planned motion sticks, slips, or drops the object. Vision can lose sight of an occluded object, while tactile sensing adds local contact information but also calibration and coverage limits.
Success on one object orientation or tool does not establish general dexterity. Evaluation should specify objects, initial poses, disturbances, sensing, resets, supervision, task tolerance, and physical trials. Human-like finger count or a polished demonstration is not a substitute for repeatable task evidence.
Sources
Related terms
Robotic manipulation
Robotic manipulation is the use of a robot to change an object's position, orientation, or state through physical interaction. It includes grasping and moving objects as well as actions such as pushing or carrying them without a grasp.
Tactile sensing
Tactile sensing measures information arising from physical contact, such as contact geometry, deformation, or force. Robots use it to observe interactions at their fingers, grippers, feet, or other contact surfaces.
Force closure
Force closure is a contact condition in which the admissible contact wrenches can collectively oppose any external wrench direction on an object. The condition depends on contact locations, normals, and the assumed friction model.
Bimanual manipulation
Bimanual manipulation is robotic manipulation in which two arms or hands coordinate their motions and contact forces to complete a task. The limbs may act symmetrically, divide different roles, or jointly constrain the same object.