JRM Vol.35 No.3 pp. 734-742
doi: 10.20965/jrm.2023.p0734


Through-Hole Detection and Finger Insertion Planning as Preceding Motion for Hooking and Caging a Ring-Shaped Objects

Koshi Makihara*, Takuya Otsubo**, and Satoshi Makita*** ORCID Icon

*Osaka University
1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan

**National Institute of Technology, Sasebo College
1-1 Okishincho, Sasebo, Nagasaki 857-1193, Japan

***Fukuoka Institute of Technology
3-30-1 Wajiro-higashi, Higashi-ku, Fukuoka, Fukuoka 811-0295, Japan

December 1, 2022
March 29, 2023
June 20, 2023
caging, manipulation, objects with holes, perception, motion planning

This study investigated a pregrasp strategy for hooking and caging ring-shaped objects. Through-hole features enable the robot hand to hook an object with holes by inserting its finger into one of the holes. Compared to directly grasping the ring, an inserting motion is more convenient to allow the uncertainty of positioning errors and avoid collisions between the hand and the object. Instead of recognizing the exact shape of the object, we only detected its ring-shaped feature as a through-hole to be inserted and estimated its approximate center position and orientation from the point cloud of the object. The estimated geometric properties enabled the approaching motion of the robotic gripper to complete insertion. The proposed perception and motion-planning method was demonstrated for rigid and deformable objects with holes.

Planning of finger insertion motion

Planning of finger insertion motion

Cite this article as:
K. Makihara, T. Otsubo, and S. Makita, “Through-Hole Detection and Finger Insertion Planning as Preceding Motion for Hooking and Caging a Ring-Shaped Objects,” J. Robot. Mechatron., Vol.35 No.3, pp. 734-742, 2023.
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Last updated on Jul. 19, 2024