Unit 2: Motion and Mechanisms

A motor shaft spinning is not yet useful robot motion. Mechanisms convert that rotation into translation, lifting, gripping, steering, or another constrained motion.

Start from what must move

The central question is how constraints and mechanisms turn motor rotation into useful robot motion.

Do not begin by picking a gear, belt, chain, or wheel because it looks familiar. Begin with the task: direction, range, speed, load, precision, space, and what motion must not occur.

Follow the mechanical chain

First, Motion Starts with Constraints shows why unwanted degrees of freedom matter. Then Gears, Belts, Chains, and Wheels compares ways to transmit motion. Finally, Choose the Mechanism from the Task forces the selection back to requirements.

Your reasoning should move in this direction:

task → required motion → constraints → transmission → predicted behavior

The artifact is a design argument

Produce a mechanism selection sketch that explains motion, constraints, and transmission. A good sketch makes another engineer able to disagree with you for a specific reason.

Useful language: joint, link, constraint, gear, belt, chain, wheel, bearing.

Simulation, paper mechanisms, CAD sketches, videos, and supervised hardware observations can all supply evidence. The concept is the motion relationship, not possession of a specific kit.