The sandbox

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$v_{1}={\frac {R_{1}}{R_{1}+R_{3}}}v$

$n+1={\frac {R_{2}}{R_{3}}}$

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$E=mc^{2}\,$

Spur Gears

Rack and Pinion

Bevel Gears

Helical Gears

Worm Drives

Planetary Gears

Harmonic Drive Gears

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