Realman Robotics Ultra-Lightweight Robotic Arm (RM75-6F)

RM75-6F Ultra-lightweight Humanoid Robotic Arm (RM75-6F)

The RM series includes both 6-DOF and 7-DOF variants; the RM75-6F is a 7-degree-of-freedom (7-DOF) model that pairs a lightweight structure with an integrated six-axis force/torque sensing capability (“6F”) for contact-rich tasks and safer human–robot collaboration.

As part of the RM-series “ultra-lightweight humanoid robotic arm” lineup, the RM75-6F targets use cases such as research and education, mobile manipulation, light industrial automation, and service-robot deployments where size, weight, and integration effort are key constraints. 

Design and Features

Lightweight, compact industrial design

RealMan positions the RM-series around portability and integration density: the robotic arm uses an aluminum-alloy body and a compact form factor intended to reduce installation complexity. The RM75-6F’s total body weight is listed at 7.9 kg, including an integrated controller, supporting deployments where minimizing external control cabinets and wiring is desirable. 

Built-in safety and collaborative behaviors

A notable RM-series feature is a built-in safety module designed to stop motion upon contact, supporting safer collaboration and enabling practical workflows such as drag-and-drop teaching for quick programming and adjustment in shared workspaces. 

Multi-interface connectivity and control modes

The RM75-6F is described as supporting multiple communication and control approaches, including Wi-Fi, Ethernet (network port), Bluetooth, USB serial, and RS485 connectivity, and control modes such as drag teaching, teach pendant operation, API control, and JSON-based control. 

Technology and Specifications

Core mechanical specifications

• Degrees of freedom (DOF): 7 

• Rated payload: 5 kg

• Peak payload: 9 kg

• Body weight: 7.9 kg

• Repeatability: ±0.05 mm 

• Working radius (reach): 638.5 mm 

Integrated six-axis force/torque capability (“6F”)

The RM75-6F is specified with:

• Six-axis force range: 200 N / 7 Nm 

• Six-axis force accuracy: <0.1% FS 

Power, protection, and materials

• Supply voltage: DC 24 V 

• Power consumption: maximum 200 W, “comprehensive” (typical) 100 W 

• Protection level: IP54 (robotic arm body) 

• Material: aluminum alloy 

• Controller: integrated 

Joint motion ranges and speed (RM75-class 7-DOF)

RealMan publishes joint motion ranges and maximum speeds for RM-series arms, indicating a wide rotational envelope and high joint speed suitable for responsive manipulation. For the 7-DOF models (including RM75-6F), the listed joint ranges include wide travel on major joints and continuous rotation on the final joint (J7 ±360°), with maximum joint speeds specified for grouped joints (e.g., J1–J2 and J3–J7).

Software ecosystem (API, ROS, ROS2)

RealMan provides a software development pathway for secondary development and integration:

• A Python API package intended for robotic-arm control, state monitoring, and development workflows, distributed via pip and GitHub, with documentation covering installation and usage. 

• ROS development support and ROS2 development support, including MoveIt/MoveIt2 configuration workflows for virtual and real-arm control. 

• Open-source repositories for ROS/ROS2 packages and examples are available under RealMan’s GitHub organization (e.g., packages covering drivers, MoveIt integration, models, and Gazebo). 

Applications and Use Cases

Force-controlled assembly and insertion

With six-axis force/torque capability, the RM75-6F is suitable for contact-guided operations such as connector insertion, alignment-sensitive placement, and light press-fit tasks—use cases where sensing contact forces can improve robustness and reduce mechanical risk.

Surface following, polishing, and inspection

Force-aware control can help maintain consistent contact during surface finishing, light polishing, deburring, or inspection routines that benefit from stable force rather than purely positional trajectories.

Education and research in manipulation

The combination of a lightweight arm, integrated controller, and ROS/ROS2 compatibility aligns with robotics education and research, including topics like motion planning, impedance/admittance control, and mobile manipulation pipelines. 

Mobile manipulation and service robotics

A ~8 kg arm with moderate reach is commonly used on AMRs and wheeled bases to create mobile manipulation platforms. Integrated connectivity options (e.g., Wi-Fi/Ethernet) and API-driven control are relevant for distributed robot architectures. 

Advantages / Benefits

• High capability-to-weight profile: A 5 kg rated payload at 7.9 kg body weight supports portable or space-constrained deployments. 

• Force-aware interaction: Six-axis force/torque sensing (200 N / 7 Nm range) can improve reliability in real-world contact tasks. 

• Integrated controller: Reduces external hardware footprint and simplifies commissioning. 

• Multiple integration paths: Connectivity (Wi-Fi/Ethernet/Bluetooth/serial options) and control modes (teach pendant, API, JSON, drag teaching) support both rapid setup and deeper software integration. 

• ROS/ROS2-friendly development: Documentation and repositories for ROS/ROS2 and MoveIt2 enable common robotics development workflows. 

FAQ Section

What is the RealMan RM75-6F?

The RealMan RM75-6F is a 7-DOF ultra-lightweight robotic arm in the RM series that includes six-axis force/torque sensing (“6F”), intended for applications that require compact integration and contact-aware manipulation. 

How does the RM75-6F work?

The RM75-6F uses joint-actuated motion across seven degrees of freedom to position and orient an end effector within a 638.5 mm working radius. Its “6F” force/torque capability provides force data (specified at 200 N / 7 Nm range) to support compliant behaviors and safer contact during interaction tasks. 

Why is the RM75-6F important?

Many real-world manipulation tasks involve uncertainty and contact. Force-aware arms can improve robustness for insertion, alignment, and surface-contact operations. The RM75-6F combines this capability with a lightweight body and integrated controller to reduce deployment overhead. 

What are the benefits of the RM75-6F?

Key benefits include 5 kg rated payload, ±0.05 mm repeatability, six-axis force/torque sensing, integrated controller, and multiple integration options (API/JSON control, multiple communication modes, and ROS/ROS2 development resources). 

Is the RM75-6F compatible with ROS2 and MoveIt2?

RealMan documents ROS2 development workflows including MoveIt2 configuration packages and launch patterns for supported arm types, and provides related repositories and documentation for ROS/ROS2 integration. 

Summary

The RealMan RM75-6F is a 7-DOF ultra-lightweight robotic arm that combines compact mechanical design with integrated six-axis force/torque sensing, collaborative-oriented safety behavior, and a practical software ecosystem spanning API development and ROS/ROS2 workflows. With a 5 kg rated payload, 638.5 mm reach, and ±0.05 mm repeatability, it is positioned for research, mobile manipulation, and light industrial tasks where force-aware interaction and fast integration matter