[Submitted on 22 Sep 2026]
Title:Spiderbot: An Open-Source Energy-Efficient Hexapod with Passive Gravity Compensation
View a PDF of the paper titled Spiderbot: An Open-Source Energy-Efficient Hexapod with Passive Gravity Compensation, by Ritwik Sharma and 2 other authors
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Abstract:Hexapod robots can achieve static stability with fewer actuated joints than bipeds or quadrupeds, yet many platforms still use 3-DOF legs, increasing weight and continuous torque requirement with limited gain in locomotion capability on flat, inclined and moderately rough terrains. We release Spiderbot, an open-source hexapod that uses a 4-bar linkage with a passive spring to mechanically support body weight, with a 2-DOF per-leg design that substantially reduces energy consumption. This mechanism substantially offloads gravitational torque during standing stance consuming only 1.5W (reduction of over 90\% over the unsprung version and up to 96\% over other similar hexapods). The passive spring compensation extends to payloads of up to 3.25kg with no additional torque requirements. The platform enables long-duration deployments on a modest battery budget and costs under \$400, making it suitable for large-scale multi-agent experiments. We validate the locomotion capabilities of the platform with an RL policy trained in mjlab, including successful sim-to-real transfer, despite the complexity of the mechanism. The platform is evaluated on flat and rough terrains, slope up to $15^\circ$ and step obstacles. We release all the CAD files, assembling instructions, and full training and deployment code along with the model checkpoints at this https URL.
Comments: 8 pages
Subjects:
Robotics (cs.RO); Systems and Control (eess.SY)
Cite as: arXiv:2609.26989 [cs.RO]
(or arXiv:2609.26989v1 [cs.RO] for this version)
https://doi.org/10.48550/arXiv.2609.26989
arXiv-issued DOI via DataCite (pending registration)
Submission history
From: Vimarsh Shah [view email] [v1] Tue, 22 Sep 2026 19:30:39 UTC (10,484 KB)
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