Rotograb: Combining Biomimetic Hands with Industrial Grippers using a Rotating Thumb

TL;DR

Rotograb is a robotic hand with a rotating thumb that enhances dexterity and workspace, combining biomimetic design with industrial efficiency through innovative joint design and reinforcement learning-based control.

Contribution

Introduces a novel tendon-actuated robotic hand with a rotating thumb, improving manipulation capabilities and integrating teleoperation with autonomous learning.

Findings

Significantly increased workspace and versatility.

Effective handling of diverse objects from the YCB dataset.

Enhanced in-hand manipulation and object rotation capabilities.

Abstract

The development of robotic grippers and hands for automation aims to emulate human dexterity without sacrificing the efficiency of industrial grippers. This study introduces Rotograb, a tendon-actuated robotic hand featuring a novel rotating thumb. The aim is to combine the dexterity of human hands with the efficiency of industrial grippers. The rotating thumb enlarges the workspace and allows in-hand manipulation. A novel joint design minimizes movement interference and simplifies kinematics, using a cutout for tendon routing. We integrate teleoperation, using a depth camera for real-time tracking and autonomous manipulation powered by reinforcement learning with proximal policy optimization. Experimental evaluations demonstrate that Rotograb's rotating thumb greatly improves both operational versatility and workspace. It can handle various grasping and manipulation tasks with objects from the YCB dataset, with particularly good results when rotating objects within its grasp. Rotograb represents a notable step towards bridging the capability gap between human hands and industrial grippers. The tendon-routing and thumb-rotating mechanisms allow for a new level of control and dexterity. Integrating teleoperation and autonomous learning underscores Rotograb's adaptability and sophistication, promising substantial advancements in both robotics research and practical applications.