Modular reconfigurable robots require reliable mechanisms for automated module exchange, but conventional rigid active couplings often fail due to inevitable positioning and orientational errors. To address this, we propose a misalignment-tolerant tool-changing system. The hardware features a motor-driven coupling utilizing passive self-alignment geometries, specifically chamfered receptacles and triangular lead-in guides, to robustly compensate for angular and lateral misalignments without complex force sensors. To make this autonomous exchange practically feasible, the mechanism is complemented by a compact rotating tool exchange station for efficient module storage. Real-world autonomous tool-picking experiments validate that the self-aligning features successfully absorb execution errors, enabling highly reliable robotic tool reconfiguration.
@article{arxiv.2603.04760,
title = {Designing and Validating a Self-Aligning Tool Changer for Modular Reconfigurable Manipulation Robots},
author = {Mahfudz Maskur and Takuya Kiyokawa and Kensuke Harada},
journal= {arXiv preprint arXiv:2603.04760},
year = {2026}
}