Learning Objectives
- Describe roles performed by robots in industry, transport and agriculture.
- Explain how sensors, processing and actuators support each role.
- Explain advantages of robots in repetitive, precise or dangerous work.
- Explain disadvantages involving cost, flexibility, employment and failure.
Key Terms
- Industrial robot
- A programmable machine used to perform physical tasks in a production or industrial environment.
- Robotic arm
- A jointed mechanical structure controlled by motors and a program.
- Transport robot
- A robotic system used to move people, goods or equipment, or to support transport operations.
- Agricultural robot
- A robot used for monitoring, planting, spraying, harvesting or other farm tasks.
- Precision
- The ability to perform movement or positioning within small limits.
- Payload
- The item, tool or material carried by a robot.
- Reprogramming
- Changing stored instructions so that the robot performs a different task or sequence.
Robots In Industry
Industrial robots can perform tasks such as moving components, welding, painting, assembling or packaging. A robotic arm uses motors at its joints and may carry a tool or gripper. Sensors can confirm position, detect an object or monitor contact.
The program defines the sequence and movement. Because the same sequence can be repeated accurately, robots are useful for high-volume production. They can work near heat, fumes, sharp tools or heavy loads, reducing direct human exposure to danger.
However, the robot and its safety equipment can be expensive. It may require specialist programming and maintenance. A fixed industrial robot may be efficient for one repeated task but less flexible when the product changes.
Robots In Transport
Robotic transport systems can move goods within a warehouse, carry equipment or support vehicle operation. Sensors detect position, distance and obstacles. The microprocessor plans or follows a route and sends signals to wheel, steering or braking actuators.
Drones can also be used to move small items or inspect transport routes and structures. Their mechanical framework, sensors, processors and motors allow controlled flight. Depending on the design, they may follow a programmed route or be supervised remotely.
Transport robots can reduce repetitive movement and operate in hazardous areas. Their disadvantages include collision risk, dependence on reliable sensors and software, battery or power limits and the need to operate safely around people.
Robots In Agriculture
Agricultural robots can monitor crops, apply materials, remove weeds, pick produce or move through fields. Sensors help identify location, obstacles, crop condition or whether an item is ready for a task. Motors move the robot and operate tools.
A drone can survey a large area and collect images or sensor readings. A ground robot can follow rows and perform repetitive actions. Robots may reduce labour and allow more targeted use of water or chemicals.
Outdoor operation is difficult. Uneven ground, weather, dust, plants of different shapes and changing light conditions can affect sensing and movement. A robot designed for one crop or field layout may not work equally well elsewhere.
Advantages Across The Roles
| Advantage | Industry | Transport | Agriculture |
|---|---|---|---|
| Repetition | Repeats assembly movement consistently | Repeats routes or deliveries | Repeats monitoring or field tasks |
| Safety | Handles heat, fumes or heavy loads | Operates in hazardous routes or locations | Reduces exposure to chemicals or difficult conditions |
| Precision | Positions tools and parts accurately | Follows controlled movement | Targets a specific crop area or item |
| Continuous work | Supports long production periods | Moves goods repeatedly | Monitors or works for extended periods |
Disadvantages Across The Roles
High purchase and development costs are common. Robots need power, maintenance and skilled support. If a robot fails, the process may stop. An incorrect sensor reading or programming error can damage products, collide with objects or perform the wrong agricultural action.
Robots can change employment by reducing some manual or repetitive roles while increasing demand for technical roles. They may also lack the judgement and dexterity of a person in an unpredictable situation. The importance of each disadvantage depends on the task.
Worked Examples
Factory Welding Robot
Question: Explain why a robot may be suitable for repeated welding.
- The programmed movement can be repeated accurately.
- The robot does not become tired.
- The human worker can be kept farther from heat and fumes.
- The equipment can operate for long production runs.
Answer: It combines consistency and safety, although installation and maintenance are costly.
Agricultural Field Robot
Question: Give one sensor-related problem for a field robot.
- Outdoor conditions are variable.
- Mud, dust or plants can obstruct a sensor.
- Incorrect data may cause poor navigation or the wrong task.
Answer: A contaminated or obstructed sensor can give incorrect readings, leading the robot to miss crops or collide with obstacles.
Examination Guidance
- Name the physical task performed by the robot before discussing advantages.
- Use the robot components in context: sensors detect, controller decides, motors or tools act.
- Do not use “robots are accurate” without stating what movement or result is accurate.
- In agriculture, account for changing outdoor conditions.
- In transport, explain collision and safety consequences where appropriate.
Common Mistakes
- Assuming a robot can perform any new task without reprogramming or different tools.
- Treating a drone as only a camera rather than a programmable robotic vehicle.
- Giving job loss as the only disadvantage.
- Ignoring maintenance, power and environment.
Knowledge Check
1. Give one industrial role for a robot.
2. Why can robots improve industrial safety?
3. What inputs may a transport robot require?
4. Give one agricultural robot role.
5. Why may agricultural robots be difficult to use?
