Industrial Guide · 4 min read
Both categories are robot arms, but they are built around opposite assumptions. One is designed to work beside a person; the other is designed to work as fast as possible behind a fence.
ⓘ Quick answer
Choose a cobot for lower volumes, frequent changeovers, tight floor space, and tasks alongside people. Choose a traditional industrial arm for high volume, heavy payloads, long reach, and the shortest possible cycle time.
What makes a cobot different
A collaborative robot is engineered to operate safely near people. It uses force and torque sensing to detect contact and stop, which is what allows it to run without a full safety cage after a proper risk assessment.
That safety comes from moving more slowly and carrying less. The trade is deliberate.
Cobot strengths
Fast to deploy, easy to reprogram, small footprint, often no cage required, straightforward to move between tasks.
Cobot limits
Lower speed, smaller payload, shorter reach, and a higher cost per unit of throughput.
What traditional arms do better
Industrial arms from manufacturers such as KUKA, ABB, and FANUC are built for throughput. Inside a guarded cell they move at full speed with high repeatability, and models exist for very heavy payloads and long reach.
The cost is integration effort. You are buying a cell, not just an arm, which means guarding, interlocks, safety scanners, fixturing, and programming.
Five questions that decide it
- What is your required cycle time? If the takt time is tight, a cobot will not reach it. This alone often settles the decision.
- What is the real payload? Add the gripper, the fixture, and the part. Buyers routinely forget the gripper and discover the arm is undersized.
- How often does the product change? Frequent changeovers favour cobots, because reprogramming is quicker and cheaper.
- How much floor space do you have? A guarded cell needs considerably more area than the arm itself. In a crowded plant this can be decisive.
- Do people need to be in the same space? If an operator must work at the same station continuously, that points to a cobot.
Two things people get wrong
- Cobots do not skip the risk assessment. The robot is designed for collaboration, but safety depends on the whole application, including the tool and the part. A cobot holding a sharp blade needs guarding like anything else.
- The arm is a minority of the cost. Grippers, vision, fixturing, integration, and programming often exceed the robot price. Compare complete cell quotes, not arm prices.
A sensible way to start
If you are automating for the first time, pick one repetitive, well-defined task with a stable part and a clear success measure, such as machine tending or palletising. Prove the workflow there before designing a larger line. Early wins on a narrow task teach you more about your own process than any vendor demonstration.
Frequently asked questions
Can a cobot really run without a safety cage?
Sometimes, but only after a risk assessment of the complete application. The tool, the part, and the surrounding layout all affect the outcome.
Are cobots cheaper overall?
Often cheaper to deploy, because integration and guarding are lighter. Per unit of output they are usually more expensive, which is why high-volume lines still use traditional arms.
Can one arm handle several different jobs?
Yes, and this is a cobot strength. Expect to invest in tool changers and fixturing to make switching practical.