This video demonstrates how a Nautilus Gear mechanism works.

Unlike conventional circular gears with a constant gear ratio, Nautilus gears use a logarithmic spiral profile. As the gears rotate, the effective contact radius continuously changes, causing the output speed and torque to vary throughout one revolution.

When two identical Nautilus gears mesh together, the system produces non-uniform motion:

Smaller radius engagement → lower speed, higher torque
Larger radius engagement → higher speed, lower torque

Despite these fluctuations, the overall gear ratio remains 1:1 per full rotation, making this mechanism ideal for motion control, educational models, and kinetic mechanical design.

This simulation highlights why Nautilus gears are fascinating to watch—even if they are rarely used in conventional machinery.

🔑 Key Features (Summary)
Variable gear ratio during rotation
Logarithmic spiral (nautilus shell–inspired) geometry
Smooth transition between speed and torque
Overall 1:1 ratio per full revolution
Visually engaging and educational mechanism

Video reference from ⁨Robothut (Youtube)
https://youtu.be/Ru72yi1Dp0g