Delta6: A Low-Cost, 6-DOF Force-Sensing Flexible End-Effector
2026-04-07 • Robotics
Robotics
AI summaryⓘ
The authors created Delta6, a low-cost device that can sense forces and torques in all directions using simple parts and 3D printing. It accurately measures how hard and in what way something is pushing or twisting it, with errors below 8% even without calibration. They tested it in real tasks like polishing and assembling tight spaces, showing it works well and is durable. The design is open-source, meaning others can build and improve it easily.
6-DOF force/torque sensingend-effectorantagonistic springsmagnetic encoders3D printingforce-impedance controllercalibrationparametric analytical modelrobotic manipulationopen-source hardware
Authors
Yue Feng, Weicheng Huang, Chen Qiu, Huixu Dong, I-Ming Chen
Abstract
This paper presents Delta6, a low-cost, six-degree-of-freedom (6-DOF) force/torque end-effector that combines antagonistic springs with magnetic encoders to deliver accurate wrench sensing while remaining as simple to assemble as flat-pack furniture. A fully 3D-printed prototype, assembled entirely from off-the-shelf parts, withstands peak forces above +/-14.4 N and torques of +/-0.33 N.m per axis; these limits can be further extended by leveraging the proposed parametric analytical model. Without calibration, Delta6 attains a 99th-percentile error of 7% full scale (FS). With lightweight sequence models, the error is reduced to 3.8% FS by the best-performing network. Benchmarks on multiple computing platforms confirm that the device's bandwidth is adjustable, enabling balanced trade-offs among update rate, accuracy, and cost, while durability, thermal drift, and zero-calibration tests confirm its robustness. With Delta6 mounted on a robot arm governed by a force-impedance controller, the system successfully performs two contact-rich tasks: buffing curved surfaces and tight assemblies. Experiments validate the design, showing that Delta6 is a robust, low-cost alternative to existing 6-DOF force sensing solutions. Open-source site: https://wings-robotics.github.io/delta6 .