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📘 How Robot Arms Work

A robot arm is a chain of rigid links connected by joints.

3
lessons
~15 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. The Arm Is a ChainExplain how links, joints, degrees of freedom, workspace, wrist motion, and payload combine to make a robot arm.A robot arm is a linked mechanism whose joints create controlled motion. Reach, orientation, and payload depend on the complete mechanical chain.
  2. Kinematics Maps MotionUse forward and inverse kinematics, pose, singularity, and calibration to explain how robot software connects joint motion to tool motion.Kinematics maps joint values to tool pose and back again. Models become useful when frames, limits, singularities, and calibration errors are made explicit.
  3. Tools, Tasks, SafetyDescribe end effectors, grasp control, motion control, safeguarding, and task-level success criteria.The end effector determines the interaction, while controllers and safeguards make motion useful and survivable in a real task.

Questions this course answers

What does inverse kinematics start with?

Inverse kinematics works backward from a desired tool position and orientation to possible joint values.

Put this robot-motion chain in order.

The controller request is executed by the joints, which moves the tool into position before the tool performs the task.

Match each robotics term to its role.

Joints create motion, the end effector applies that motion to a task, and the workspace describes what poses the arm can reach.

Grounded in trusted sources

  • NASA JPL, The Telerobotics Laboratory: https://robotics.jpl.nasa.gov/how-we-do-it/facilities/the-telerobotics-laboratory/
  • NASA Science, Robotic Arm End Effector: https://science.nasa.gov/photojournal/robotic-arm-end-effector/
  • NIST, Modeling of Industrial Robot Kinematics Using a Hybrid Analytical and Statistical Approach: https://www.nist.gov/publications/modeling-industrial-robot-kinematics-using-hybrid-analytical-and-statistical-approach
  • NIST, A Simple Guide for Manufacturers on When to Choose a Robot: https://www.nist.gov/blogs/manufacturing-innovation-blog/simple-guide-manufacturers-when-choose-robot

Every Wunder lesson is built from real, reputable sources — never invented.

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