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When a 6-Axis Robot Falls Short: The Case for 7-Axis Robots

In the rapidly evolving world of robotics, each additional axis can significantly expand a robot's capabilities and the complexity of tasks it can handle. While 6-axis robots are versatile and effective for a wide range of applications, there are specific scenarios where they might not suffice, and a 7-axis robot becomes essential. This article explores those scenarios, shedding light on when an extra axis translates into necessary functionality.

Limitations of 6-Axis Robots

A 6-axis robot offers considerable flexibility with its ability to rotate around its base and maneuver its arm in various directions. However, its range of motion can still be restricted due to the limitations in joint design and arm configuration. These robots typically excel in picking, placing, assembly, welding, and painting tasks within their reach and orientation capabilities. The critical limitations arise in the following areas:

  1. Complex Work Environments: In environments where the robot needs to manipulate objects around obstacles or in tight spaces, a 6-axis robot can struggle. The robot may not be able to reach around or behind structures without repositioning the entire unit or the workpiece, which is not always feasible.

  2. High-Density Workspaces: Workspaces crowded with equipment, conveyors, or other machinery limit a robot's accessibility to certain areas. The fixed range of motion in 6-axis robots might prevent them from executing tasks effectively in such congested environments.

  3. Multi-Task Efficiency: While 6-axis robots can perform a variety of tasks, switching between different tasks that require reorientation or repositioning of the arm can lead to inefficiencies and increased cycle times.

Advantages of 7-Axis Robots

A 7-axis robot incorporates an additional joint that provides greater flexibility, essentially giving the robotic arm the ability to maneuver more like a human arm. This additional degree of freedom allows the robot to overcome many of the limitations faced by 6-axis robots:

  1. Enhanced Reach and Flexibility: The extra joint in a 7-axis robot allows it to extend its reach around obstacles, making it possible to work in tight or complex spaces without the need for repositioning. This capability is particularly valuable in automotive assembly, aerospace manufacturing, and other industries where space is at a premium.

  2. Improved Accessibility: With its enhanced flexibility, a 7-axis robot can easily access parts of a product that are difficult to reach. This is crucial in processes like complex assembly, intricate welding, or detailed finishing tasks where angles and accessibility are challenging.

  3. Streamlined Operations: The added axis allows for smoother, more continuous motion patterns. This can reduce the time it takes to complete tasks by minimizing the need for stop-and-go movements often necessary with 6-axis robots to adjust orientation or position.

  4. Reduced Interference and Collision: The extra degree of freedom helps in programming paths that avoid collisions with other machines or structures within the workspace, enhancing safety and reducing downtime due to accidents.

Industries Benefiting from 7-Axis Robots

Industries that handle complex assemblies or operate in constrained spaces can benefit significantly from the adoption of 7-axis robots. These include:

  • Aerospace and Aviation: For manufacturing and maintenance tasks where components are tightly packed and precision is paramount.

  • Automotive Industry: Especially in assembly lines where space is limited and accessibility is crucial for installing components like wiring harnesses.

  • Metal Fabrication: Where complex welding patterns are required around multiple axes.

While 6-axis robots continue to serve a broad spectrum of industrial needs effectively, the advent of 7-axis robots addresses specific challenges that their counterparts cannot. By providing solutions that require advanced agility and flexibility, 7-axis robots are carving a niche in scenarios where precision and efficiency in complex environments are paramount. As industries continue to push the boundaries of what is achievable in automation, the role of 7-axis robots is likely to expand, heralding a new era of robotic capabilities.


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