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Explainer

What Is a Collaborative Robot?

A collaborative robot, or cobot, is an arm designed to operate in a collaborative application with people, typically using power and force limiting so contact stays within defined limits. It can also be hand-guided. Collaborative is a mode of operation defined by a risk assessment. It is not a promise that you can delete the safety system.

Answer from AI Robotics Australasia. .

What the standards actually describe

Collaborative operation is a set of methods, not a marketing category. In practice you will hear four: a safety-rated monitored stop, hand guiding, speed and separation monitoring, and power and force limiting. A given cell may use one of them. The risk assessment says which are acceptable for that task, that gripper, and that part.

A sharp gripper, a heavy offset tool, or a hazardous process such as welding can make a 'cobot' cell require the same guarding as an industrial robot. The arm's certification does not certify your fixture.

Why factories buy them

Cobots are chosen because they are faster to teach, easier to move between tasks, and often able to share a floor with people after the assessment allows it. Machine tending, screwdriving, light palletising, and inspection are the common fits.

They are a poor fit when the datasheet is already the constraint. Payload, reach, and speed limits are real. Slowing the robot every time a person walks past can erase the throughput you bought it for.

What to ask before you specify one

Ask for the payload at the actual tool, not at the flange. Ask what happens when an operator enters the area. Ask who reteaches a new part, and how long that takes on your worst variant, not on the sample in the video.

If those answers are comfortable, a cobot is often the simplest cell. If they are not, an industrial robot with guarding is the honest design.

Related questions

What is a cobot?

Cobot is the short name for a collaborative robot. It is an arm built for collaborative operation, most often power-and-force-limited and hand-guided, used where people and the robot share a task or a space.

Is a collaborative robot safe to work next to?

It can be, after a risk assessment of the whole cell, including the gripper and the part. The arm alone being collaborative does not make the application safe, and it does not always remove the need for scanners or guards.

What is the difference between a cobot and a normal robot?

A traditional industrial robot is designed to run at process speed inside a guarded cell. A cobot is designed so a collaborative mode with people is possible. Industrial robots still win on payload, speed, and harsh processes.

Do collaborative robots need programming?

Yes. Hand guiding makes the first waypoints faster. The cell still needs logic for the gripper, the machine interface, faults, and each part variant. 'No programming' is not a real claim.

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