Types of Industrial Robots: 6 Main Types, Uses and Applications
Industrial robots have become an important part of modern manufacturing. They can perform repetitive, precise and physically demanding tasks such as welding, assembly, packaging, material handling and inspection.
However, not every industrial robot is designed for the same job.
The types of industrial robots differ mainly in their mechanical structure, movement, reach, speed and payload capacity. Choosing the right configuration depends on what a factory needs the robot to accomplish.
In this guide, we will look at six major industrial robot types, how they work, their common applications and the situations where each type can be useful.
What Is an Industrial Robot?
An industrial robot is a programmable machine designed to automatically perform physical tasks in an industrial environment.
Unlike a machine built to perform only one fixed operation, many industrial robots can be programmed and equipped with different tools for different applications.
A robot may use a gripper to move components, a welding tool to join metal parts or a vision system to identify objects on a production line.
The mechanical design of the robot determines how it can move within its workspace.
What Are the Main Types of Industrial Robots?
The main industrial robot configurations include:
- Articulated robots
- Cartesian robots
- SCARA robots
- Delta robots
- Cylindrical robots
- Spherical or polar robots
Collaborative robots, commonly called cobots, are another important category. However, cobot describes how a robot is designed to operate around people rather than representing one specific mechanical structure.
1. Articulated Robots
Articulated robots use multiple rotary joints to move an arm through different positions and orientations.
They are one of the most flexible industrial robot designs and are widely used in manufacturing.
A typical six-axis articulated robot can move its end effector in several directions while also changing its orientation.
How Articulated Robots Work
The robot consists of connected arm sections controlled by motors and joints.
A controller coordinates the movement of these joints to position a tool at a specific location.
Different end effectors can be attached to the robot depending on the task.
Examples include:
- Welding torches
- Grippers
- Paint applicators
- Drilling tools
- Polishing tools
- Cutting tools
Common Applications
Articulated robots are commonly used for:
- Welding
- Painting
- Assembly
- Material handling
- Machine tending
- Palletizing
- Inspection
- Automotive manufacturing
Advantages
The main advantage of an articulated robot is its flexibility.
It can approach a component from different angles and perform tasks that require complex movement.
Limitation
Articulated robots can require more sophisticated programming and safety systems than simpler robot configurations.
2. Cartesian Robots
Cartesian robots are also known as linear robots or gantry robots.
They move primarily along straight linear axes, usually represented as X, Y and Z.
How Cartesian Robots Work
A Cartesian robot can move:
- Left and right
- Forward and backward
- Up and down
This creates a rectangular working area.
Because the robot's movement is based on linear coordinates, Cartesian systems can be well suited to applications where objects need to be moved between predictable positions.
Common Applications
Cartesian robots are used for:
- Pick and place
- Machine loading
- Machine unloading
- Assembly
- Packaging
- Material handling
- Automated machining
- 3D printing
Advantages
Cartesian robots can offer:
- Precise linear movement
- Good repeatability
- Straightforward positioning
- Efficient use of overhead space in gantry systems
Limitation
Their movement is less flexible than an articulated robot when a tool needs to approach an object from many different angles.
3. SCARA Robots
SCARA stands for Selective Compliance Assembly Robot Arm.
SCARA robots are particularly well suited to fast assembly and pick-and-place operations.
Their design allows rapid horizontal movement while maintaining controlled vertical movement.
How SCARA Robots Work
A typical SCARA robot uses rotary joints for horizontal movement and another axis for vertical positioning.
This combination makes the robot useful for tasks where components need to be quickly picked up, positioned and assembled.
Common Applications
SCARA robots are often used for:
- Electronics assembly
- Component insertion
- Pick and place
- Packaging
- Screwdriving
- Small-part assembly
- Inspection
Advantages
SCARA robots are known for their speed and repeatability.
They can be particularly effective when a manufacturing process involves repetitive movements within a relatively defined workspace.
Limitation
SCARA robots are not as flexible as six-axis articulated robots for complex three-dimensional manipulation.
4. Delta Robots
Delta robots use a parallel-arm mechanism rather than a conventional serial robotic arm.
They are often mounted above a conveyor or production area.
Why Are Delta Robots Fast?
The design keeps much of the robot's heavier equipment away from the moving platform.
This allows the moving components to remain relatively lightweight, enabling rapid movement.
For this reason, Delta robots are particularly useful for high-speed picking and sorting.
Common Applications
Delta robots can be used for:
- Food packaging
- Pharmaceutical packaging
- Sorting
- Pick and place
- Conveyor operations
- Small product handling
For example, a vision system can identify products moving along a conveyor while the Delta robot quickly picks selected items and places them into another location.
Advantages
- High operating speed
- Good repeatability
- Effective for pick-and-place operations
- Suitable for high-volume production
Limitation
Delta robots are less suitable for applications that require heavy payloads or complex tool orientations.
5. Cylindrical Robots
Cylindrical robots combine rotary and linear movement to create a roughly cylindrical working area.
The robot can rotate around a central axis while its arm moves in other directions.
How Cylindrical Robots Work
A typical cylindrical robot uses rotational movement around its base combined with linear movement.
This allows the robot to access positions arranged around a central workspace.
Common Applications
Cylindrical robots have been used for:
- Material handling
- Machine loading
- Assembly
- Welding
- Component handling
- Manufacturing operations
Advantages
Their design can work well when the production area is arranged around a central point.
Limitation
Cylindrical robots are less common in many modern applications than articulated, Cartesian and SCARA robots.
6. Spherical or Polar Robots
Spherical robots, also called polar robots, use rotary and linear joints to create a curved or spherical working envelope.
Their design allows the arm to rotate and extend from its base.
How Spherical Robots Work
The robot combines rotational movement with linear extension.
This gives it a curved workspace around its base rather than the rectangular workspace associated with a Cartesian robot.
Applications
Spherical robots have historically been used for:
- Material handling
- Welding
- Die casting
- Machine operations
- Industrial handling
Are Spherical Robots Still Common?
They are less prominent in many modern manufacturing environments than articulated, SCARA, Cartesian and Delta robots.
However, they remain useful when studying the development and classification of industrial robot designs.
Industrial Robot Types Compared
The following comparison provides a quick overview of the major configurations.
| Robot type | Main movement | Common applications | Main advantage |
|---|---|---|---|
| Articulated | Rotary joints | Welding, painting, assembly | Flexibility |
| Cartesian | Linear X-Y-Z | Pick and place, machining | Precise linear movement |
| SCARA | Horizontal rotary + vertical | Assembly, electronics | Speed |
| Delta | Parallel-arm movement | Packaging, sorting | High-speed operation |
| Cylindrical | Rotary + linear | Handling, machine loading | Cylindrical workspace |
| Spherical/Polar | Rotary + linear | Handling, specialized tasks | Curved workspace |
The table shows why there is no single industrial robot that is best for every manufacturing application.
What Are Collaborative Robots?
Collaborative robots, or cobots, are designed for applications where robots and people may work in closer proximity under appropriate safety conditions.
The important point is that a cobot is not necessarily a completely different mechanical structure.
A collaborative robot can use different physical configurations depending on the application.
What makes the system collaborative is the combination of robot design, safety features, tooling, workspace and application requirements.
Common Cobot Applications
Cobots can be used for:
- Assembly
- Machine tending
- Packaging
- Inspection
- Screwdriving
- Material handling
- Palletizing
A robot should not automatically be considered safe for direct human contact simply because it is described as a cobot. The complete application must be evaluated according to the appropriate safety requirements.
Industrial Robot Type vs. Industrial Robot Application
A common mistake when learning about robotics is confusing a robot's type with its application.
For example:
Articulated describes the robot's mechanical structure.
Welding describes the task the robot performs.
An articulated robot can therefore be used for welding, painting, assembly or material handling.
Similarly, a SCARA robot can perform assembly or pick-and-place operations.
This distinction is important because the same robot configuration can be used for several different manufacturing processes.
Which Type of Industrial Robot Is Best?
There is no universal answer.
The right industrial robot depends on the production requirements.
Important factors include:
- Payload
- Reach
- Speed
- Accuracy
- Repeatability
- Number of axes
- Workspace
- Product size
- Production volume
- Required flexibility
- End effector
- Safety requirements
For example, a factory requiring complex movement may consider an articulated robot, while a high-speed packaging line may benefit from a Delta robot.
A manufacturer performing small electronic assembly may consider SCARA, while an application based around straight X-Y-Z movement may be better suited to a Cartesian system.
How to Choose an Industrial Robot
Before selecting a robot, manufacturers should first understand the task.
1. Determine the Payload
The robot must be capable of safely carrying the product, tool and any additional equipment attached to its end effector.
2. Measure the Required Reach
The robot needs sufficient reach to access every required position in its workspace.
3. Consider Production Speed
High-volume production may require a robot designed for rapid repetitive movements.
4. Check Accuracy and Repeatability
Precision applications may require a robot with suitable positioning accuracy and repeatability.
5. Consider the Workspace
The physical layout of the factory can influence which robot configuration is appropriate.
6. Consider Human Interaction
If workers will operate near the robot, the complete application should be evaluated for appropriate safety measures.
7. Select the Right End Effector
The end effector is the tool attached to the robot.
Examples include:
- Grippers
- Welding tools
- Suction cups
- Screwdrivers
- Cutting tools
- Inspection cameras
The robot and its end effector need to work together as a complete system.
How AI Is Changing Industrial Robotics
Artificial intelligence is becoming increasingly important in robotics.
Traditional industrial robots often rely on programmed movements and predictable production processes.
AI and machine vision can help robots handle more variable environments.
For example, a vision system can identify the position of objects on a conveyor, allowing a robot to respond to their actual location instead of relying entirely on fixed positions.
AI can also support:
- Object recognition
- Path planning
- Quality inspection
- Predictive maintenance
- Anomaly detection
- Adaptive automation
However, AI does not replace the importance of the robot's mechanical design.
An articulated robot and a Delta robot may both use AI, but their physical capabilities remain different.
The robot's mechanical structure determines how it moves, while its software determines how intelligently it can respond.
Industrial Robots in Different Industries
Different industries have different automation requirements.
Automotive
Automotive manufacturing uses robots for tasks such as welding, painting, assembly and material handling.
Articulated robots are particularly useful when components require complex positioning.
Electronics
Electronics manufacturing often requires precise and repetitive assembly.
SCARA robots can be suitable for component placement and other small-part operations.
Food and Packaging
Packaging lines can require extremely fast picking and sorting.
Delta robots are often suited to these high-speed applications.
General Manufacturing
Manufacturers can use articulated, Cartesian, SCARA, Delta and collaborative systems depending on the production process.
The robot should be selected based on the task rather than simply choosing the most advanced or expensive model.
The Future of Industrial Robots
Industrial robotics is moving beyond simple repetitive automation.
Advances in machine vision, sensors, artificial intelligence, simulation and robotics software are helping manufacturers develop more flexible automation systems.
This could allow robots to handle a wider variety of products and respond to changes in production environments.
At the same time, the fundamentals of industrial robotics remain important.
A robot still needs the appropriate:
- Mechanical structure
- Payload capacity
- Reach
- Speed
- Accuracy
- End effector
- Control system
- Safety system
The future of manufacturing is therefore likely to combine traditional industrial robotics with increasingly capable software and AI.
Frequently Asked Questions
What are the main types of industrial robots?
The main types of industrial robots include articulated, Cartesian, SCARA, Delta, cylindrical and spherical or polar robots.
What is the most common type of industrial robot?
Articulated robots are widely used because their multiple joints provide flexibility for applications such as welding, assembly, painting and material handling.
Which industrial robot is best for welding?
Articulated robots are commonly used for welding because their multiple joints allow the welding tool to approach components from different angles.
Which robot is best for pick and place?
Delta robots are particularly suitable for high-speed pick-and-place operations. SCARA and Cartesian robots can also be used depending on the application.
What is a SCARA robot used for?
SCARA robots are commonly used for assembly, pick and place, component insertion, packaging and other repetitive operations.
What is a Delta robot?
A Delta robot is a parallel robot that uses multiple arms connected to a moving platform. Its lightweight moving structure allows very fast movement.
What is the difference between Cartesian and articulated robots?
Cartesian robots primarily use linear X, Y and Z movement, while articulated robots use rotary joints. Cartesian robots are suitable for defined linear workspaces, while articulated robots offer greater movement flexibility.
Are cobots a type of industrial robot?
Cobots are collaborative robots designed for applications where people and robots may work in closer proximity under appropriate safety conditions. Cobot describes the collaborative application rather than one specific mechanical structure.
Can industrial robots use AI?
Yes. Industrial robots can use AI with technologies such as machine vision, object recognition, planning and predictive systems. AI can make robotic automation more adaptable while the robot's mechanical structure determines its physical movement capabilities.
How much does an industrial robot cost?
The cost varies depending on the robot type, payload, reach, accuracy, controller, end effector, software, installation and other integration requirements. The robot itself is only one part of the total automation cost.
Final Takeaway
The main types of industrial robots are distinguished by their mechanical structure and movement.
Articulated robots provide flexibility, Cartesian robots provide linear movement, SCARA robots are well suited to fast assembly, and Delta robots are designed for high-speed pick-and-place applications. Cylindrical and spherical robots use different movement geometries for more specialized tasks.
There is no single best industrial robot for every factory.
The right choice depends on the required payload, reach, speed, accuracy, workspace, production volume and application.
As AI and machine vision continue to develop, industrial robots are becoming more adaptable. But the fundamental principle remains the same:
The type of robot determines how it can move, while the application determines what it needs to accomplish.
