US What a cobot is
A cobot, short for collaborative robot, is an industrial robot arm designed to share a workspace with people. Instead of working behind fences, it limits its own speed and force, senses unexpected contact and stops or slows when someone comes close.
Traditional industrial robots are fast and powerful, so they work inside guarded cells. Cobots trade some speed and payload for the ability to share space with people. Every application still needs a risk assessment, because a cobot carrying a sharp or heavy part can be hazardous even when the robot itself is designed for collaboration.
The word was coined in the 1990s by researchers at Northwestern University for passive devices that guided a human operator. Today it describes a whole class of lightweight robot arms used in factories, warehouses and laboratories.
How cobots work safely with people
Collaborative operation is defined in the robot safety standards ISO 10218 and ISO/TS 15066. They describe four ways a robot and a person can share space, and a cobot application uses one or more of them:
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Safety-rated monitored stop. The robot stops whenever a person enters the shared space and resumes when they leave.
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Hand guiding. An operator moves the arm directly by hand, for teaching positions or assisting with a load.
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Speed and separation monitoring. Scanners or cameras track people, and the robot slows or stops as they get closer.
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Power and force limiting. The robot is designed so any contact stays below force and pressure limits for the body region involved.
Why power and force limiting matters
Power and force limiting is what most people mean by a cobot. Torque sensing in each joint, rounded covers and lighter arms keep the energy of any contact low. ISO/TS 15066 gives limits for different parts of the body, so the hand can tolerate more than the head or neck. The integrator checks the whole application, including the tool and the part, against those limits.
Cobot vs industrial robot
Cobots and industrial robots are complementary rather than competing. The table shows the usual differences; individual models vary.
| Feature | Cobot | Industrial robot |
|---|---|---|
| Guarding | Often none, subject to risk assessment | Fenced cell or light curtains |
| Payload | Typically around 3 to 30 kg | From a few kg to several hundred kg |
| Speed | Limited when people are near | Full speed inside the cell |
| Programming | Hand guiding, tablet apps | Teach pendant and robot code |
| Redeployment | Quick to move to a new task | Usually fixed to one cell |
| Best for | Mixed, changing, lighter work | High-speed, heavy, high-volume work |
In practice, many sites use both: an industrial robot for a high-speed welding or palletising cell, and cobots for lighter tasks on lines where staff also work.
What cobots are used for
Cobots suit repetitive, low to medium payload jobs where people and machines share the line. Common applications include:
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Machine tending. Loading and unloading CNC machines, presses and injection moulding machines.
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Picking and packing. Placing products into trays, boxes and cartons at the end of a line.
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Palletising. Stacking boxes onto pallets in smaller, mixed-product operations.
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Assembly and screwdriving. Repetitive fastening and part insertion with consistent torque.
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Inspection. Holding a camera or part for quality checks, often guided by machine vision.
Benefits and limits
Cobots are popular with smaller manufacturers and with lines that change product often, because they lower the effort of automating a task. Their limits are the other side of the same design choices.
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Benefit: small footprint. No fenced cell, so a cobot fits into an existing line beside a person.
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Benefit: quick to redeploy. Light arms on mobile stands can move between machines as production changes.
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Benefit: better ergonomics. The robot takes the lifting and repetitive motion, and staff keep the judgment work.
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Limit: speed and payload. Force limits keep cycle times and payloads below those of an industrial robot.
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Limit: the application still needs safety design. Tools, parts and fixtures can make a collaborative robot unsafe without extra measures.
Vision and AI on cobots
Cameras and AI give a cobot awareness beyond its own joint sensors. Vision lets it find parts that are not in a fixed position, check quality as it works and recognize when people are approaching. Our pose estimation FAQ explains how AI tracks the positions of people around a robot, and our machine vision FAQ covers the inspection side.
This processing usually runs on an edge computer beside the robot, which talks to the cobot’s own controller over Ethernet. Our robot controller FAQ explains how the two divide the work. Rugged Jetson computers are a common choice because they run several camera streams and AI models in a compact, fanless system. See the human-robot collaboration case study for an example.
Quick answers on cobots
Cobots: common questions
What does cobot stand for?
Collaborative robot. The name reflects that the robot is designed to work with people in a shared space, not apart from them.
What is the difference between a cobot and a robot?
How it shares space with people. A cobot limits its speed and force so it can work beside people. A conventional industrial robot is faster and stronger but needs guarding.
Do cobots need safety fencing?
Often not, but it depends on the risk assessment. A sharp tool, heavy part or high speed can still require guarding or scanners even with a cobot.
How much can a cobot lift?
Typically around 3 to 30 kg. Most models sit in that range. Heavier collaborative robots exist, but they usually run with extra sensing such as area scanners.
Are cobots hard to program?
Usually not. Many are taught by moving the arm by hand and setting steps on a tablet. Complex vision or AI tasks still need integration work.
We supply edge AI computers for cobot vision and safety monitoring with the cameras, drivers and software stack integrated as standard. Tell us the cell layout, the cameras and the tasks, and we will recommend a system to suit.