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As interest in Physical AI continues to grow, the scope of artificial intelligence is expanding beyond the digital realm into the physical world. AI is no longer limited to generating text or images. It is now being combined with robotics technology that perceives its surroundings, makes decisions, and produces real physical motion.
This shift is prompting a rethink of the role of robots across manufacturing, logistics, and service environments. Demand is rising for robots that can do more than repeat fixed motions, robots that can adapt to varied work environments and assist people with their tasks. Real-world job sites in particular involve a great deal of physical interaction, such as gripping and moving objects or holding and assembling parts, which is why a robot’s drive performance and joint structure are becoming increasingly important factors.
In this article, we look at the characteristics and potential applications of bimanual robots, which are drawing attention amid these trends, and explore why robotic actuator technology, the key to robot joint performance, matters so much.
What Is a Dual Arm Robot? How It Differs From a 6-Axis Robot
Arm-type robots have been used in industrial settings for a long time. The most representative example is the 6-axis industrial robot. By moving multiple joints, a 6-axis robot can adopt a wide range of postures, and it has been used across manufacturing, logistics, automotive, electronics, and other industries. With fast motion speeds and high repeatability, these robots have played a key role in raising the level of automation on mass-production lines.
More recently, collaborative robots that can work alongside people in the same space have also been introduced to many industrial sites. Compared with conventional industrial robots, collaborative robots are relatively flexible to install and operate, so they are used to support workers in a variety of processes such as parts assembly, inspection, and packaging. Because they can be applied not only to fixed production lines but also to comparatively small workspaces, they are helping to broaden the reach of automation.
However, both 6-axis industrial robots and collaborative robots share a structural limitation: they perform tasks around a single arm. In real job sites, many tasks are difficult to handle with just one hand. For example, holding an object steady on one side while assembling it from the other, gripping a box while removing tape, or positioning a part while simultaneously fastening it. These two-handed tasks are natural for people, but they are not easy for a single arm robot to carry out without separate auxiliary equipment.
For this reason, conventional automated processes have often relied on jigs or dedicated fixtures to hold workpieces in place. The drawback of this approach is that a new fixture must be designed and built every time the workpiece or product specification changes. In environments with high-mix, low-volume production or frequently changing work items, this can become a factor that reduces flexibility. In addition, because most 6-axis industrial robots and collaborative robots are designed to operate fixed in a specific position, they also have limits when it comes to moving between multiple workspaces to perform different processes.
Humanoid robots have attracted attention as one direction for addressing these limitations, but a structure that has to balance and move on two legs still carries a heavy technical burden for immediate use in industrial settings. Walking stability, control difficulty, safety, and cost all have to be solved together.
Bimanual robots can be seen as a form of robot that reflects these practical needs. The upper body is configured with two arms, like a human torso, so it can perform tasks that require two-handed cooperation, while the lower body uses a wheel-based mobile platform to secure mobility within the workspace. In other words, it strikes a balance between the industrial applicability of existing single arm robots and the two-handed working capability that humanoid robots aim for.
Dual Arm Robots: The Practical Value of a Semi-Humanoid
A bimanual robot can be viewed as a semi-humanoid form that implements the upper-body-centric tasks needed in industrial settings before fully transitioning to a complete humanoid robot. If humanoid robots evolve toward replicating the entire human body structure, the bimanual robot focuses on manipulation functions centered on the arms and torso.
This structure is meaningful in connecting human workspaces with robotic automation technology. Many tasks in industrial settings take place in front of equipment, conveyors, and workbenches, and in these spaces, upper-body functions such as recognizing objects, approaching them, and performing the required motions matter more than full-body locomotion. At this point, dual arm robots can reflect part of the direction of humanoids while evolving into a form that is easy to apply to actual processes.
Bimanual robots also become more useful as semi-humanoids when combined with vision, sensor, and AI technologies. Vision systems are used to recognize the position and posture of a target, and sensors are used to detect contact states or changes in force. When AI-based decision-making is added, a robot can advance beyond performing fixed, repetitive motions and move toward adjusting its actions in response to changes in the work environment.
In this way, a bimanual robot is not an attempt to immediately realize a fully human-like robot. Rather, it is a form that allows the potential of human-like robots to be examined first, centered on the upper-body manipulation functions needed in industrial settings. From the perspective of the semi-humanoid, the bimanual robot can carry significance as an intermediate stage that accelerates the industrial application of humanoid technology.
Robot Joints and Robotic Actuators Behind a Dual Arm Robot’s Movement
For a bimanual robot to perform tasks reliably across various industrial settings, it needs drive technology that can move both arms with the desired speed and force. Lifting an object, aligning its position, and assembling it are all accomplished as the movements of multiple joints, corresponding to the shoulders, elbows, and wrists, mesh together. The working capability of a bimanual robot is therefore closely tied not only to the structure of its two arms but also to how stably each robot joint can move.
The key component that generates joint movement is the actuator. An actuator converts the control system’s commands into actual physical motion, allowing the robot arm to move with the speed and force a task requires. For a bimanual robot to grip and secure parts, distribute a load across both arms, or carry out assembly motions with consistent force, the performance of the robotic actuators applied to each joint is treated as critical.
Bimanual robots in particular often have to work in spaces close to people, or secure a wide range of motion within a confined workspace. For this reason, the drive unit in the joint must be able to stably generate the torque required for the operation while reducing its size. Even if the size is reduced, failing to transmit sufficient force can cause posture to break down during motion or reduce the stability of repetitive movements.
In addition, dual arm robots that operate in environments with repeated heavy loads must have the durability to cope with load variations. An actuator therefore has to be considered not only for its compact structure but also for the durability to withstand repetitive motion and external loads. Ultimately, the joint drive unit of a bimanual robot calls for a combination of a size that fits within a small space, the torque a task requires, and the structural stability needed for long-term operation.
The BCSA Series: Securing Robot Joint Space with a Thin Structure
We offer a range of drive technologies and actuator solutions designed to meet the needs of the next-generation robot market, including bimanual robots. Among them, the BCSA series is an robotic actuator engineered to deliver high torque even within a thin structure, and it comes in a broad lineup so you can select the right option according to your application environment and required performance.
A key feature of the BCSA series is its thin structure, which reduces the size of the drive unit. A smaller drive unit allows the interior of the joint to be used more efficiently, making it easier to place additional components such as sensors, control devices, and batteries. This can be an important factor in next-generation robot design, where multiple functions must fit within the limited joint space of a dual arm robot.
The BCSA series is a robot actuator built on cycloidal reduction technology, designed to transmit power stably even in environments with large load variations. The cycloidal tooth profile transmits power through a rolling-like rotational motion inside the unit, so relatively stable drive characteristics can be expected even under repetitive loads. In areas like robot joints, where motion changes frequently and momentary loads occur, these structural characteristics play an important role.
The BCSA V4 builds on this reduction structure and is designed with both a thin profile and high torque in mind. In particular, its internal gear structure adopts a pinless design, focusing on simplifying the structure and securing rigidity. Fewer parts not only streamline the assembly process but also help reduce variation between products, which is advantageous for maintaining consistent quality during mass production. As a result, this can also translate into long-term drive reliability.
These characteristics are becoming even more important in next-generation robot platforms such as dual arm robots. A bimanual robot can be seen as an intermediate stage in the evolution from a conventional 6-axis robot toward a humanoid, but in real industrial settings it is showing potential beyond that. Using two arms, it can handle objects like a person, and combined with a mobile platform, it can be applied across logistics, manufacturing, services, and other environments. As AI technology is added, we expect that it will expand beyond simple repetitive tasks into areas that require more complex judgment and motion.
Bonsystems specializes in developing robot actuators and provides a variety of drive solutions to keep pace with these changes in the robot market. If you are evaluating a suitable robotic actuator for a bimanual robot project, or want to check whether the BCSA series can be applied to a robot or piece of equipment you are currently developing, please reach out to us through the Bonsystems website.
FAQ
Q. Why are bimanual robots drawing so much attention recently?
Because real work sites involve many tasks that are difficult to handle with just one hand. For example, holding an object steady on one side while assembling it from the other, or positioning a part while fastening a screw. These two-handed tasks are natural for people, but a robot with only one arm finds them hard to carry out without a separate fixture. The bimanual robot reflects these practical needs and is built so that two arms can perform tasks requiring two-handed cooperation.
Q. Why is a dual arm robot called a “semi-humanoid”?
Because while humanoid robots evolve toward fully replicating the human body structure, the bimanual robot focuses on upper-body manipulation functions centered on the arms and torso. A complete humanoid that balances and walks on two legs still has many challenges to solve, including walking stability, control difficulty, safety, and cost, so it is a heavy burden to apply directly to industrial settings for now. By comparison, a bimanual robot can first take on the upper-body-centric tasks that happen in front of workbenches or conveyors, making it a stage for verifying the potential of human-like robots before applying them to industrial sites.
Q. What role does an robotic actuator play in the movement of a robot arm?
An actuator is the key component that converts the control system’s commands into actual physical motion. By analogy with the human body, it is what moves joints such as the shoulder, elbow, and wrist with the desired speed and force. Lifting an object, aligning its position, and assembling it are all accomplished as the movements of multiple joints mesh together, so the performance of the actuator in each joint is directly linked to the robot’s working capability.
Q. What are the benefits of a thinner, smaller actuator structure?
Because reducing the size of the drive unit allows the space inside the robot joint to be used more efficiently. The space that is freed up can hold additional components such as sensors, control devices, and batteries. In next-generation robot design, where multiple functions must fit within the limited joint space of a bimanual robot, a structure that delivers the required torque stably even at a small size becomes an important design factor.
Q. In what fields might dual arm robots be used going forward?
Bimanual robots use two arms to handle objects like a person, and combined with a wheel-based mobile platform, they can move freely around a workspace. Thanks to these characteristics, they have potential across logistics, manufacturing, services, and other fields. When vision, sensor, and AI technologies are added, the range of use is expected to broaden further, extending beyond simple repetitive tasks to forms that can collaborate with people or perform a wider variety of work.
References
- GIST, AI Dual-Arm Robot Gripping Technology That Handles Objects Like a Human (The Robot News, 2026)
- Five years of ABB’s groundbreaking collaborative robot YuMi (ABB YouTube, 2020)
- Dual-Arm Robotic Machine Unveiled for Disaster Site Deployment (iNews24, 2021)
- Japan’s Kurabo Develops Robot Technology for Threading a Needle (The Robot News, 2017)
- Dual-Arm Robots for Complex Assembly Tasks (AMD MACHINES)
