Ufactory xArm 7 — Specs & Review
Specifications
| Brand | Ufactory |
|---|---|
| Model | xArm 7 |
| Year | 2020 |
| Category | Modular Diy |
| Autonomy | programmable |
| Environment | indoor |
| Price (USD) | $2299–$2599 |
| Connectivity | Ethernet, USB, ROS/ROS2, Wi-Fi |
| Country of origin | CN |
Key features
- 7-DOF with kinematic redundancy for elbow avoidance
- Built-in torque sensing on all 7 joints
- 3.5kg payload, 700mm reach
- Python, ROS/ROS2, MATLAB SDK
- Fraction of Franka Panda and KUKA LBR iiwa cost
- Suitable for imitation learning and force control research
- CE certified
What is it?
The xArm 7 is Ufactory's 7-DOF research robot arm — the highest-specification arm in the xArm series. The 7th axis provides kinematic redundancy, meaning the arm can position its end effector in the same location with different elbow configurations, enabling obstacle avoidance and more human-like motion.
Who is it for?
Advanced robotics research teams studying dexterous manipulation, human-like motion planning, imitation learning, and teleoperation. Researchers who need the extra kinematic redundancy of a 7-DOF arm for work in constrained environments or dual-arm coordination. Teams that would otherwise use Franka Emika Panda or KUKA LBR iiwa but need an affordable alternative.
Key specs
- DOF: 7 axes
- Payload: 3.5 kg
- Reach: 700 mm
- Repeatability: ±0.1 mm
- Force sensing: Built-in joint torque sensors (all 7 joints)
- SDK: Python, ROS/ROS2, C++, MATLAB
- Safety: CE certified
- Weight: ~14 kg
- Origin: China
7-DOF significance
A 6-DOF arm has exactly enough axes to position the end effector at any reachable point with any orientation — but only one way. A 7-DOF arm can reach the same point with multiple elbow configurations, enabling obstacle avoidance, more natural motion, and simultaneous position and null-space control. This is why KUKA LBR iiwa and Franka Panda are 7-DOF research standards.
How it compares
Franka Emika Panda (7-DOF, 3kg payload, 855mm reach): ~$17,000. KUKA LBR iiwa 7 (7-DOF, 7kg): ~$75,000. xArm 7 (7-DOF, 3.5kg, 700mm): ~$2,299. For research teams needing 7-DOF without institutional procurement budgets, xArm 7 fills a previously empty market position.
Limitations
- 3.5kg payload less than xArm 6 (5kg) due to 7th joint mass
- Not ISO 10218 industrial safety certified
- Franka Panda has superior torque sensing resolution and a larger research ecosystem (Franka Control Interface)
- Chinese manufacture may face procurement restrictions in some research contexts
FAQ
Why is 7 DOF better than 6 DOF for research?
A 7-DOF arm has kinematic redundancy: it can position its end effector at the same location with different elbow configurations. This enables obstacle avoidance, more human-like motion, and null-space control — important for research in constrained environments, dual-arm coordination, and human-robot interaction.
How does xArm 7 compare to Franka Emika Panda?
Both are 7-DOF arms with joint torque sensing. Franka Panda has a larger research ecosystem (Franka Control Interface, polymetis, large open-source dataset), more refined torque sensing, and a longer track record in manipulation research. xArm 7 costs approximately 10-15% of Panda's price.
Can xArm 7 be used for imitation learning research?
Yes. xArm 7 has been used in published imitation learning research. Python SDK and ROS2 support enable integration with popular IL frameworks. Community simulation models (MuJoCo, PyBullet) are available.
What is the payload of xArm 7?
xArm 7 has a 3.5kg payload — less than the 6-DOF xArm 6 (5kg) because the 7th joint adds mass to the arm structure. For tasks requiring more than 3.5kg payload, xArm 6 is more appropriate.