Collaborative robots, or cobots, are robots designed to work alongside people rather than behind safety fences. They are smaller, easier to program and more affordable than traditional industrial robots, which has opened robotics to small and mid-sized manufacturers. This guide explains what cobots are, where they fit and how to decide whether to use one.
Key takeaways
- Cobots share a workspace with people using force limits, sensors and safe design.
- They suit repetitive, varied or ergonomically hard tasks in low-to-medium volumes.
- Each application still needs a risk assessment, because the tool or part can be hazardous even if the arm is safe.
- Payback often comes from redeploying staff to higher-value work, not from replacing them.
A short video shows cobots in action:
How cobots stay safe
Cobots use features such as force and torque limits, rounded surfaces, speed limits near people and sensors that stop motion on unexpected contact. Safety standards such as ISO 10218 and ISO/TS 15066 guide how collaborative applications are designed. The arm being “collaborative” does not make the whole cell safe, so a risk assessment of the gripper, tools and workpiece is still required.
Common uses
- Machine tending: loading and unloading CNC machines or presses.
- Pick and place, packing and palletising.
- Assembly and screw driving.
- Quality inspection with cameras; see computer vision challenges.
- Welding, gluing and dispensing for small batches.
- Lab and food handling where consistency matters.
Benefits and limits
| Benefits | Limits |
|---|---|
| Fast to deploy and reprogram | Lower payload and speed than industrial robots |
| Small footprint and flexible placement | Safety assessment still needed per application |
| Lower cost of entry | Not ideal for very high-volume lines |
| Reduces strain from repetitive tasks | Needs sound processes and part presentation |
How to decide
- List tasks that are repetitive, strain-causing or hard to staff.
- Measure cycle time, payload and reach needed.
- Check how consistently parts arrive and are positioned.
- Estimate payback including tooling, integration and training.
- Pilot one cell and involve the operators who will use it.
Cobots are one piece of the wider shift covered in AI in Industry 4.0, and increasingly pair with vision and AI. For software-side automation, see our RPA roadmap.
A worked example: machine tending
A small metal shop runs a CNC machine that needs a part loaded every two minutes. Staff spend hours standing at the machine doing repetitive loading. A cobot with a gripper and a simple part tray takes over loading and unloading, so the machine keeps running through breaks and in the evening. The operator now prepares trays, checks quality and handles setup. Typical gains are higher machine utilisation and fewer repetitive-strain issues, though results depend on part consistency and cycle time.
What to check before buying
- Payload and reach: include the weight of the gripper and the part.
- Repeatability: how precisely the arm returns to a position.
- Programming: hand-guiding, tablet interface or code; who will maintain it?
- Integration: compatibility with your machines, sensors and safety devices.
- Support and training: local integrators and spare parts.
- Total cost: arm, gripper, guarding if needed, integration and training.
Common mistakes
- Skipping the risk assessment because the arm is labelled collaborative.
- Choosing a task with highly inconsistent parts that need constant manual fixing.
- Expecting industrial-robot speed from a cobot.
- Leaving operators out of the design, which leads to poor adoption.
Done well, a first cobot cell becomes a template that can be copied to other tasks, building skills and confidence across the team.
Frequently asked questions
What is the difference between a cobot and an industrial robot?
Cobots are built to work safely near people and are easy to reprogram. Industrial robots are faster and stronger but usually operate inside safety cages.
Are cobots safe to work with?
They include safety features, but safety depends on the whole application, including tools and parts. A risk assessment is required.
Will cobots replace workers?
They mostly take over repetitive or physically hard tasks. Many companies redeploy staff to supervision, quality and setup roles.
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