Gear speed simulator
A larger driven gear turns more slowly—and backward.
Playback is compressed; model values are shown separately.
Make a prediction
How does the driven gear rotate?
Ready. Adjust the settings or press Run.
How it works & assumptions
For external meshing gears, ωB=−ωA×NA/NB. Pitch radii scale with tooth count; rotation direction reverses.
Ideal two-gear mesh without slip or backlash. Stylized teeth illustrate the pitch ratio, not a manufacturing profile.
References: Gears & Linkages, Spring 2009, Prof. A. Techet
This is an ideal mathematical model, not a measurement or a forecast.