What Is a Collaborative Robot?
A collaborative robot, commonly called a cobot, is an industrial robot designed to work in the same general workspace as people. Unlike traditional industrial robots, which are often separated from workers by fences or safety cages, cobots can be designed and integrated for applications where humans and robots work much closer together.
The idea isn't simply to replace a worker. Cobots are often used to handle repetitive, physically demanding, or highly consistent portions of a job while people handle tasks requiring judgment, dexterity, problem-solving, or adaptation.
How Cobots Differ From Traditional Industrial Robots
Traditional industrial robots are built primarily around speed, payload, reach, and repeatability. In automotive plants, for example, large robotic arms can weld, paint, move heavy components, and perform the same motion thousands of times per shift.
Cobots generally prioritize a different combination of characteristics:
- Easier programming and deployment
- Smaller footprints
- Flexible task changes
- Human-robot collaboration
- Integrated safety functions
- Lower barriers to automation for smaller manufacturers
That doesn't mean a cobot is automatically safe in every situation. The entire robotic application must be evaluated for safety, including the robot, end effector, workpiece, tooling, speed, forces, and surrounding equipment.
How Cobots Work
Mechanically, many cobots resemble conventional articulated robot arms. They contain a series of joints driven by motors that position an end effector in three-dimensional space.
What distinguishes many cobot systems is the combination of sensors, control software, and safety functions used to monitor their operation.
Depending on the robot and application, these systems can include joint torque sensing, force sensing, speed monitoring, position monitoring, collision detection, and safety-rated control functions.
If the robot detects conditions outside configured limits, the system can slow down or stop.
Programming a Cobot
One reason cobots have become popular is that many are easier to program than traditional industrial robots.
Some systems allow an operator to physically guide the robot arm through a desired motion and record positions along the way. A graphical interface can then be used to define actions such as:
- Move to a position
- Open the gripper
- Pick up a component
- Move to another position
- Place the component
- Return to the starting point
- Repeat
More advanced applications can integrate machine vision, force control, conveyors, PLCs, sensors, databases, and other industrial equipment.
Where Cobots Are Used
Cobots are increasingly used anywhere manufacturers need flexible automation without dedicating enormous amounts of floor space to a traditional robotic cell.
Common applications include:
Machine Tending
A cobot can load and unload CNC machines, presses, test equipment, and other production machinery.
Pick and Place
Cobots can repeatedly move components between trays, conveyors, fixtures, or workstations.
Assembly
With the proper tooling, cobots can perform screwdriving, fastening, insertion, dispensing, and other repetitive assembly operations.
Packaging and Palletizing
Cobots can pack products into containers or stack boxes onto pallets, reducing repetitive lifting for workers.
Inspection
When equipped with cameras or other sensors, a cobot can position parts for inspection or move an inspection system around a product.
Welding
Collaborative robotic welding systems have become particularly interesting to smaller fabrication shops because they can automate repetitive welds without requiring the scale of a traditional automotive-style robotic installation.
End Effectors: The Robot's Hands
The robot arm itself is only part of a cobot system. The tool attached to the end of the arm determines what work the robot can actually perform.
Common end effectors include:
- Parallel grippers
- Vacuum grippers
- Screwdrivers
- Welding torches
- Sanders
- Dispensing tools
- Force/torque sensors
- Machine-vision cameras
- Custom tooling
Changing the end effector can transform the same robotic arm into a completely different automation system.
Why Small and Mid-Sized Manufacturers Use Cobots
Traditional industrial automation can require significant engineering, floor space, safety infrastructure, and capital.
Cobots can lower some of those barriers.
A manufacturer might deploy a cobot to automate one repetitive process, then reprogram or redeploy it when production requirements change. That flexibility can make robotic automation practical for companies producing smaller batches or frequently changing products.
Cobots Don't Eliminate the Need for Safety Engineering
The word collaborative can be misleading.
A cobot is not automatically safe simply because the manufacturer labels it collaborative.
Consider a cobot carrying a sharp piece of metal, operating a welding torch, spinning a cutting tool, or moving a heavy component. The robot may contain sophisticated safety technology while the overall application still presents serious hazards.
Proper robotic deployments require a risk assessment and appropriate safeguards based on the complete application.
Cobots and the Future of Automation
Cobots represent a broader change in industrial robotics.
Robots are becoming easier to program, easier to integrate, and practical for a wider range of businesses. At the same time, improvements in computer vision, artificial intelligence, force sensing, and robotic manipulation are expanding the types of tasks these machines can perform.
The long-term significance of collaborative robots may therefore be larger than the cobot category itself.
They are helping move robotics from highly specialized automation cells toward machines that can operate more flexibly throughout factories, warehouses, laboratories, and other working environments.