PLATO Hand: Shaping Contact Behavior with Fingernails for Precise Manipulation

2026-02-05

AI Summary

This work addresses the limited grasp stability and force perception of robotic hands when manipulating irregularly shaped objects in fine manipulation tasks. The authors propose PLATO, a dexterous hand featuring an innovative hybrid fingertip design that integrates rigid “nails” embedded within soft pads. Guided by a strain-energy-driven bending–indentation mechanical model, this design enables a synergistic mechanism that preserves localized indentation while suppressing global bending. Combined with structured contact geometry and force–motion transparent transmission, the hand significantly enhances pinch stability and force observability. Experimental validation demonstrates successful execution of edge-sensitive tasks—including paper sorting, card picking, and orange peeling—confirming its effectiveness in high-precision manipulation.

Technology Category

• Intelligent Robots: Manipulation
• Planning, Routing, and Scheduling: Activity and Plan Recognition
• Humans and AI: Interaction Techniques and Devices

Application Category

• Systems and Infrastructure for Web, Mobile and WoT: Applied ML and AI for Web-based mobile applications
• Responsible Web: Machine-in-the-loop, human agency and autonomy
• Economics, Online Markets and Human Computation: The sharing economy

Abstract

We present the PLATO Hand, a dexterous robotic hand with a hybrid fingertip that embeds a rigid fingernail within a compliant pulp. This design shapes contact behavior to enable diverse interaction modes across a range of object geometries. We develop a strain-energy-based bending-indentation model to guide the fingertip design and to explain how guided contact preserves local indentation while suppressing global bending. Experimental results show that the proposed robotic hand design demonstrates improved pinching stability, enhanced force observability, and successful execution of edge-sensitive manipulation tasks, including paper singulation, card picking, and orange peeling. Together, these results show that coupling structured contact geometry with a force-motion transparent mechanism provides a principled, physically embodied approach to precise manipulation.

Problem

• dexterous manipulation
• contact behavior
• robotic hand
• precise manipulation
• fingertip design

Innovation

• hybrid fingertip
• structured contact
• strain-energy model
• precise manipulation
• force-motion transparency