Robot Finger Mechanism Design: Degrees of Freedom, Kinematics, and Compliance

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The article explains that robot finger mechanism design is foundational to robot hand engineering, since finger structure governs grasp stability, dexterity, payload, durability, and overall system intelligence. It notes that finger design differs from industrial arm design because fingers operate in constrained, contact-rich environments where friction, compliance, and force distribution must be considered from the outset. Key decisions discussed include the number of degrees of freedom, which trades manipulation capability against complexity, cost, and control difficulty, and the kinematic layout of links and joints, often modeled loosely on the human hand. The text also contrasts fully actuated designs with underactuated ones that use springs, tendons, or differential mechanisms, and emphasizes compliance as a means to adapt to uncertain object shapes and reduce impact failures. It concludes by highlighting the balance engineers must strike between stiffness and compliance, typically supported by finite element analysis, and noting that transmission design also strongly affects performance.

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