Collaborative robots, commonly called cobots, are robots designed to support applications in which people and robotic systems operate in close proximity under defined conditions. The term does not mean that every robot labelled collaborative can safely work beside a person under every circumstance. Collaborative operation depends on the robot, end-effector, workpiece, software, operating mode, speed, force, environment and risk assessment. Cobots commonly incorporate force or torque sensing, configurable speed and safety functions that allow particular forms of human-robot interaction. They are widely used for assembly, machine tending, inspection, packaging, material handling and other tasks where combining human dexterity with robotic repeatability can be useful.
Traditional industrial robots commonly operate inside guarded cells because their speed, payload and movement can present significant hazards. Collaborative systems are engineered to support specific modes of interaction with reduced risk, potentially allowing some applications to operate without conventional physical guarding. Techniques can include safety-rated monitored stop, hand guiding, speed and separation monitoring, power and force limiting, and other control strategies. The suitability of a particular collaborative mode depends on the complete application rather than the robot arm alone. For example, a relatively gentle robot fitted with a sharp, hot or heavy tool can still create serious hazards. The concept of collaboration therefore concerns the complete robotic application and its interaction with people.
Force and torque sensing are important technologies in many collaborative robots. Sensors can detect external forces or unexpected resistance and allow the controller to stop or modify motion. This can support hand-guiding during programming or help the robot detect contact conditions. Some systems estimate forces from motor currents or incorporate dedicated sensors at joints or in the wrist. However, sensing does not make physical contact inherently safe. The magnitude, duration, location and nature of a collision determine potential injury, and tools or workpieces can introduce hazards independent of the robot's motion. Consequently, safety assessment must consider the actual forces and contact scenarios possible in the application.
Cobots are often attractive for small and medium-sized manufacturers because they can be comparatively flexible and can sometimes be deployed in production environments without the extensive fixed infrastructure associated with conventional robotic cells. Their programming interfaces may allow operators to teach positions by moving the robot manually or by using graphical interfaces. This can reduce programming barriers for certain applications, although complex production tasks can still require specialist engineering. Mobile bases, vision systems and interchangeable tools can further increase flexibility. The trade-off is that a cobot optimised for collaborative operation may have lower speed or payload than a conventional industrial robot used behind guarding.
Common applications include machine tending, screwdriving, assembly, packaging, quality inspection and material handling. A human may perform tasks requiring judgement or dexterity while the robot performs repetitive positioning, lifting or process operations. In machine tending, for example, the robot can move parts between a machine tool and a workholding system while the operator manages setup or quality tasks. In assembly, a robot can present or hold components while a worker performs fine manipulation. These arrangements are often described as human-robot collaboration, but the actual division of labour depends on task requirements, cycle times and safety constraints rather than on a universal model of cooperation.
Programming and deployment can be simplified through graphical interfaces, teaching by demonstration and reusable motion templates. Nevertheless, collaborative robot programming still requires understanding of coordinate systems, tool geometry, payload, collision behaviour and process constraints. Vision systems can allow cobots to identify or locate objects, while force sensing can support insertion or assembly tasks where contact is expected. End-effectors need careful design because sharp edges, pinch points, suction systems and powered tools can create hazards. The robot's nominal specifications therefore provide only part of the information needed to determine whether a particular task is suitable for collaborative operation.
Collaborative robots can improve flexibility, reduce repetitive manual handling and allow automation of tasks that may not justify a large fixed robotic cell. They can also be redeployed between tasks more readily in some production environments. Limitations include lower speed in certain operating modes, payload restrictions, application-specific safety requirements, integration effort and the need for skilled risk assessment. A common misconception is that cobots are inherently safe simply because they are designed for collaboration. In reality, collaborative operation is conditional and must be evaluated for the complete system. Safety settings can also be affected by payload, tooling and programmed behaviour, meaning that changing the application can require a new assessment.
Collaborative robotics represents an important convergence between industrial automation and human-centred production. It does not eliminate conventional industrial robots, because high-speed, high-payload operations can still favour fully guarded automation. Instead, cobots provide another engineering option where human proximity, flexibility and relatively easy redeployment are valuable. Their development has encouraged greater attention to force control, human detection, safety-rated monitoring and intuitive programming. The defining characteristic is therefore not simply a small robotic arm or the absence of guarding, but the deliberate engineering of robotic systems for particular forms of controlled interaction with people while maintaining appropriate safety constraints.
