What Are Industrial Robots?

Industrial robots are automatically controlled, reprogrammable, multipurpose manipulators programmable in three or more axes, installed in manufacturing and logistics environments to perform material handling, processing, and assembly tasks. The definition, set out in the ISO 8373 vocabulary and carried into the ISO 10218 safety standard, separates them from fixed automation by the reprogrammability requirement: a machine that can be retasked in software for a different part or process is a robot, while a single-purpose transfer machine is not. The category covers the manipulator arm, its drives and sensors, the controller, and the teach pendant or programming interface, and it excludes the end effector and workpiece fixtures, which belong to the wider robot system.

The field grew from the Unimate arm installed at a General Motors die-casting plant in 1961 and now rests on established practice in mechanism design, servo control, and industrial networking. The International Federation of Robotics publishes the annual installation and operating-stock statistics that the industry uses as its reference series, with automotive and electronics manufacturing accounting for the largest shares of new installations.

Mechanical Configurations

Most industrial arms fall into a small number of kinematic families chosen for the reach and stiffness the task demands. The six-axis articulated arm, with revolute joints throughout, gives full position and orientation control within a roughly spherical workspace and dominates welding, painting, and general handling. SCARA arms are compliant in the horizontal plane and stiff vertically, which suits high-speed pick-and-place and vertical insertion. Cartesian and gantry robots trade workspace efficiency for straightforward kinematics and large payload capacity, while parallel delta mechanisms place all actuators on the fixed base to achieve very low moving mass and cycle times measured in tenths of a second. Payload, reach, repeatability, and cycle time are the specification parameters that separate models within each family, with repeatability for a mid-size articulated arm typically quoted between 0.02 and 0.1 mm.

Control and Programming

The controller closes servo loops on each joint, resolves the inverse kinematics that map a commanded tool pose to joint angles, and generates trajectories that respect velocity, acceleration, and jerk limits. Programming has historically been done by teaching, in which an operator jogs the arm to positions recorded as waypoints, supplemented by vendor-specific offline languages and by simulation packages that generate and validate paths against a CAD model of the cell. Force control and compliance extend the range of feasible tasks to assembly, deburring, and polishing, where position control alone would jam or damage the part. Machine vision supplies part location and inspection, letting robots work with unfixtured parts on moving conveyors.

Safety and Collaborative Operation

Safety governs cell design as strongly as cycle time does. Traditional installations rely on physical separation: fences, interlocked gates, light curtains, and safety-rated controllers that force a protective stop when a person enters the workspace, an approach summarized in the OSHA guidance on robotics standards. Collaborative operation removes the fence and instead limits the hazard, using safety-rated monitored stop, hand guiding, speed and separation monitoring, or power and force limiting. The biomechanical limits underpinning that last mode originated in ISO/TS 15066 and have since been folded into the 2025 revision of ISO 10218; work on variable impedance control based on those limits shows how contact forces are held below the threshold during physical human-robot interaction.

Applications

Industrial robots have applications across a wide range of manufacturing sectors, including:

• Automotive body-in-white spot welding, sealing, and painting
• Electronics assembly, component placement, and screwdriving
• Palletizing, depalletizing, and warehouse order fulfillment
• Machine tending for injection molding, casting, and CNC machining
• Arc welding and additive manufacturing of large metal structures
• Food processing, packaging, and pharmaceutical handling