What is a collaborative robot or cobot?
A collaborative robot, or cobot, is a type of industrial robot designed specifically to work in the same physical space as human operators — without the need for perimeter safety fencing. Unlike traditional industrial robots, which operate inside fully isolated cells for safety reasons, cobots incorporate force sensors, speed limiting and contact detection mechanisms that cause them to stop or reduce their force upon contact with a person.
The term was coined in 1996 by researchers J. Edward Colgate and Michael Peshkin, but it was Universal Robots, founded in 2005 in Denmark, that made the concept commercially viable with the first affordable cobots for mid-size manufacturing. Since then, the cobot market has grown exponentially and is expected to exceed $9 billion globally before 2030.
Key differences between cobots and traditional industrial robots
| Criterion | Traditional industrial robot | Collaborative robot (cobot) |
|---|---|---|
| Work space | Fenced cell, restricted access | Shared with operators |
| Typical payload | 10 – 2,000 kg | 3 – 35 kg (most models) |
| Operating speed | High (up to 3 m/s) | Reduced in collaborative mode |
| Integration time | Weeks or months | Days (for standard applications) |
| Programming | Specific code (KRL, RAPID, AS) | Visual interface + teach-by-demonstration |
| Initial investment | High (full cell) | Moderate, lower infrastructure cost |
| Relocation | Complex (fencing required) | Simple (can be mobile) |
| Safety mechanism | Physical separation | Force and speed monitoring |
The table shows that cobots are not necessarily superior in raw performance — a Kuka KR 1000 can lift 1,000 kg at high speed, something no cobot can match. The differentiating advantage lies in flexibility, integration cost and the ability to operate in mixed spaces where redesigning a layout to install safety fencing is not feasible or economically justifiable.
Leading cobot manufacturers
The cobot market is dominated by a small group of manufacturers that together account for the majority of global installations:
Universal Robots (UR)
Pioneer and market leader. The range runs from the UR3e (3 kg payload, ideal for fine assembly) to the UR20 (20 kg) and UR30 (30 kg), with reaches of up to 1,750 mm. The PolyScope programming platform is intuitive, and the UR+ ecosystem of certified components (grippers, sensors, mobile bases) drastically reduces integration time.
ABB (GoFa and SWIFTI)
ABB entered the cobot market with the GoFa family (up to 12 kg) aimed at precision work, and the SWIFTI for applications requiring high speed with presence detection. Natural integration with ABB's PLC and drive ecosystem.
FANUC (CRX series)
FANUC's CRX series combines the recognised robustness of its industrial robots with a simplified tablet-based programming interface and lead-through teaching. Available in payloads from 5 to 25 kg.
KUKA (LBR iisy)
The LBR iisy series offers cobots in 3, 6 and 11 kg versions with torque sensors in every joint, enabling highly sensitive contact detection. Particularly suited to applications where contact force must be controlled with precision, such as assembly of fragile components or operator assistance on manual assembly lines.
Techman Robot (TM)
One of the few brands that integrates machine vision directly into the robot wrist, reducing installation complexity for pick-and-place applications with multiple part variants. Especially popular in electronics and logistics.
Real-world cobot applications in industry
Cobots have found their niche in a defined set of applications where their characteristics offer a better fit than conventional industrial robots:
Pick and place and machine tending
The most widespread application. The cobot picks parts from a conveyor or tray and loads them into a CNC machine, press or assembly station — freeing the operator from a repetitive, ergonomically harmful task. Because it can work without fencing, the operator can still intervene in the cell for adjustments or incidents without stopping the system.
Quality control and visual inspection
With an integrated or wrist-mounted camera, the cobot can inspect parts from multiple positions with repeatability that no human operator can match. Vision systems combined with cobots detect surface defects, verify dimensions or read DataMatrix codes with consistent cycle times.
Screwdriving and assembly
The precise torque control of modern cobots makes them ideal for screwdriving operations where a specific force is required and traceability of each torque applied is needed. Widely used in electronics, automotive and appliance manufacturing.
MIG/TIG welding in short runs
For small to medium production volumes where traditional welding robots (with their full cell infrastructure) are not economically justified, cobots with welding torches offer a more agile solution. The operator can adjust the welding path through lead-through programming without starting from scratch.
Light palletising
With the higher-payload models (UR20, UR30), cobots can palletise light to medium-weight boxes alongside operators — without requiring the infrastructure of a full robotic cell like the ones we integrate with Kuka for high-throughput applications.
Ergonomic assistance
An increasing number of plants are integrating cobots as a "third arm" for operators: the robot holds or positions a heavy part while the worker performs the manual operation. This reduces musculoskeletal injuries without removing the human intervention that is genuinely necessary.
Safety standards for collaborative robots
Safe cobot operation is not automatic simply because the manufacturer labels it "collaborative". Real safety depends on a correct risk assessment of the specific application, not the robot itself. The reference standard is ISO/TS 15066:2016, complementary to ISO 10218, which defines four collaborative operation modes:
- Safety-rated monitored stop (SMS): the robot halts when the operator enters the shared workspace.
- Hand guiding (HG): the operator can move the robot manually without programming.
- Speed and separation monitoring (SSM): the robot reduces speed based on distance to the operator.
- Power and force limiting (PFL): the most genuinely "collaborative" mode, where the robot can keep moving but limits its force on contact.
At Bluemation we carry out risk assessments for each cobot application in accordance with ISO/TS 15066, verifying that force and speed parameters comply with the limits established for each body region and contact zone. We never assume a cobot is safe by default — we verify it with data.
When is a cobot the right choice — and when is it not?
A cobot makes sense when these conditions are met:
- The task is repetitive and ergonomically harmful for the operator (repetitive movements, awkward postures, loads between 2 and 10 kg).
- Production is medium or low volume, with frequent changeovers that make a full robotic cell impractical.
- The available space does not allow fencing installation, or reconfiguring the layout has a prohibitive cost.
- Cycle time is not critical — cobots operate more slowly than industrial robots in collaborative mode.
A cobot is not the right solution when the payload exceeds 20–30 kg, when maximum cycle speed is essential, or when production volume justifies the investment in a full robotic cell.
If you are unsure whether a cobot fits your process, at Bluemation we provide a no-obligation technical and economic feasibility assessment. Tell us about the application and we will give you an honest answer with real data on cycle times, payloads and estimated ROI.