Module Check: Precise Movement
You have covered the full arc of making robots move precisely — from the first electrical command through actuators, joints, kinematics, and feedback control all the way to locomotion, balance, and grasping. Before moving on, this lesson consolidates the key vocabulary, tests your understanding of the core concepts, and challenges you to apply everything in a design scenario. Take your time — a strong check now means a stronger foundation for every robotics topic ahead.
Flashcards — click each card to reveal the answer
Module Quiz
A robot arm has three revolute joints. How many degrees of freedom does it have, and what does that limit?
A stepper motor drives a conveyor belt. If the load suddenly increases and causes one step to be missed, what happens to all subsequent position commands?
A quadruped robot is walking slowly and keeps at least three feet forming a triangle that contains its center of mass at all times. A sudden gust of wind pushes the robot sideways. Will it fall?
An underwater inspection robot needs to communicate sensor data back to a surface control station in real time. Why cannot it use standard radio communication?
Which PID term is specifically responsible for preventing a robot joint from permanently settling slightly short of its target angle due to friction?
What is the core difference between a parallel-jaw gripper and a soft pneumatic gripper for handling varied objects?
Design a Robotic Sorting Station
- You are a junior robotics engineer tasked with designing a robotic sorting station for a small food-packaging company. The station must pick individual apples from a conveyor belt and place each one gently into one of three bins (small, medium, large) based on apple size. The apples vary in diameter from 6 to 9 cm and arrive in random positions on the belt.
- Part 1 — Actuators and Arm Design:
- Choose an actuator type for the arm joints. Justify your choice in two sentences. Describe how many degrees of freedom the arm needs and why.
- Part 2 — Control Strategy:
- Will the arm joints use open-loop or closed-loop control? Explain your reasoning and describe what sensor(s) would be part of the control loop.
- Part 3 — Gripper Selection:
- Choose a gripper type for picking apples. Explain why a parallel-jaw gripper might be problematic here and how your chosen gripper addresses that problem.
- Part 4 — Stability:
- The arm is mounted on a mobile platform that can move between conveyor lines. Describe one balance challenge this creates and one design choice that addresses it.
- Part 5 — Failure Mode:
- Describe one likely failure mode of your system (something that will go wrong in real use) and how you would detect and recover from it.