Gears

Gears patiently builds a mechanical transmission from first principles, pairing a substantial article with diagrams described as adjustable and animated. It is a rewarding technical read for anyone who wants to understand not just gear ratios, but why tooth shapes preserve them.

What is Gears?

The lesson begins before the teeth arrive. Points on a rotating disc establish the difference between angular and linear velocity, two touching discs introduce transmission, and a wrench turns torque from a formula into something familiar. Only then do gear teeth enter the picture. The later sections use tangent and normal lines, pitch circles, and the image of string unwinding from a disc to explain how an involute profile is formed. Multi-gear arrangements close the loop with idlers, compound stages, and a neat warning about the classic three-gear jam. The page is long and equation-friendly, but its sequence keeps each new idea meshed with the last one.

What you can do there

• Read a visual explanation of rotational motion and gear geometry
• Adjust article diagrams and animation timelines

Why we picked it

Most gear explainers hurry to a ratio and call the machine understood. This one lingers on the geometry and force transfer underneath, with a progression that independent reviewers also singled out for making the mechanics intuitive. The result treats a familiar row of teeth as a small mathematical plot twist.

How to get the most from it

Give it a proper reading session rather than a quick skim. Follow the disc and torque sections in order, then use the page's described sliders to slow down the tooth-contact examples when you can view them in a suitable browser. Pause animations whenever motion competes with the equations.

Good to know

This is a lengthy conceptual explainer about idealized simple spur gears, not a manufacturing guide. No rendered session was performed here, so live controls, device compatibility, audio, accessibility, and performance remain unverified. The creator's archive dates the article to February 12, 2020.

Who made it, and when?

Bartosz Ciechanowski is the credited creator or organization. The earliest supported launch date we found is February 12, 2020.