# Quasi-Direct Drive for Low-Cost Compliant Robotic Manipulation

arXiv: https://arxiv.org/abs/1904.03815 · HTML: https://mlsanity.com/paper/1904.03815/

## Key facts

- Cited by 5 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 8 Apr 2019.

## Built on by (most cited first, 5 of 5)

- [HomeRobot: Open-Vocabulary Mobile Manipulation](https://mlsanity.com/paper/2306.11565/) (2023)
- [RoboCopilot: Human-in-the-loop Interactive Imitation Learning for Robot Manipulation](https://mlsanity.com/paper/2503.07771/) (2025)
- [EveryDayVLA: A Vision-Language-Action Model for Affordable Robotic Manipulation](https://mlsanity.com/paper/2511.05397/) (2025)
- [Bridging the Sim-to-Real Gap with multipanda_ros2: A Real-Time ROS2 Framework for Multimanual Systems](https://mlsanity.com/paper/2602.02269/) (2026)
- [IRIS: Learning-Driven Task-Specific Cinema Robot Arm for Visuomotor Motion Control](https://mlsanity.com/paper/2602.17537/) (2026)

## Abstract (arXiv)

Robots must cost less and be force-controlled to enable widespread, safe deployment in unconstrained human environments. We propose Quasi-Direct Drive actuation as a capable paradigm for robotic force-controlled manipulation in human environments at low-cost. Our prototype - Blue - is a human scale 7 Degree of Freedom arm with 2kg payload. Blue can cost less than 5000. We show that Blue has dynamic properties that meet or exceed the needs of human operators: the robot has a nominal position-control bandwidth of 7.5Hz and repeatability within 4mm. We demonstrate a Virtual Reality based interface that can be used as a method for telepresence and collecting robot training demonstrations. Manufacturability, scaling, and potential use-cases for the Blue system are also addressed. Videos and additional information can be found online at berkeleyopenarms.github.io