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Robot Anatomy & Components Cheat Sheet
A printable reference covering robot structure, sensors, actuators, controllers, power systems, and end effectors for grades 6-12.
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Robotics: Robot Anatomy & Components covers the main physical and electronic parts that make a robot work. Students need this cheat sheet to connect robot parts to their jobs, such as sensing, thinking, moving, and doing useful tasks. It is useful for building, troubleshooting, and explaining robots in class projects or competitions. Most robots include a frame, power source, controller, sensors, actuators, and an end effector or tool. Sensors provide input, the controller processes information, and actuators create motion. Important relationships include power = voltage x current, speed = distance ÷ time, and gear ratio = driven gear teeth ÷ driving gear teeth.
Key Facts
- A robot usually has a frame, power system, controller, sensors, actuators, wiring, and an end effector.
- Sensors are input devices that measure conditions such as distance, light, touch, rotation, sound, or temperature.
- Actuators are output devices that convert electrical energy into motion, such as motors, servos, solenoids, or pneumatic cylinders.
- The controller is the robot brain because it reads sensor inputs, runs a program, and sends commands to outputs.
- Electrical power can be estimated with the formula power = voltage x current.
- Robot speed can be calculated with the formula speed = distance ÷ time.
- A gear ratio can be calculated with the formula gear ratio = driven gear teeth ÷ driving gear teeth.
- A higher gear ratio usually increases torque but lowers speed, while a lower gear ratio usually increases speed but lowers torque.
Vocabulary
- Frame
- The frame is the physical structure that supports and protects the robot's parts.
- Sensor
- A sensor is a device that detects information from the robot's environment or body.
- Actuator
- An actuator is a device that creates motion or force when controlled by the robot.
- Controller
- The controller is the computer or microcontroller that runs the robot's program and sends commands.
- End Effector
- An end effector is the tool or attachment a robot uses to interact with objects, such as a gripper or claw.
- Power System
- The power system supplies electrical energy to the robot using batteries, wires, switches, and regulators.
Common Mistakes to Avoid
- Confusing sensors with actuators is wrong because sensors collect input while actuators create output motion or force.
- Ignoring the power requirements is wrong because motors and controllers may fail or reset if the battery cannot supply enough voltage or current.
- Mounting parts without a strong frame is wrong because loose or flexible structures can cause inaccurate movement and broken connections.
- Choosing a motor based only on speed is wrong because a robot also needs enough torque to move its load or operate its mechanism.
- Forgetting wire management is wrong because tangled or loose wires can unplug, catch on moving parts, or create short circuits.
Practice Questions
- 1 A robot travels 3 meters in 6 seconds. What is its average speed?
- 2 A motor uses 2 amps from a 12 volt battery. What power does the motor use?
- 3 A robot arm gear train has a 60-tooth driven gear and a 20-tooth driving gear. What is the gear ratio?
- 4 A robot needs to pick up heavy blocks but its arm moves too fast and slips. Which component choices could improve the design, and why?