Tamiya

Tamiya’s 70168 double gearbox packs two independent gear trains into a compact and affordable package that is great for small mobile robots

Two FA-130 type motors are included.

Each side can be assembled to have one of four gear ratios: 12.7:1, 38:1, 115:1, or 344:1.

The Tamiya 70097 twin-motor gearbox is a small (3-inch long) plastic gearbox. It contains two small DC motors that drive separate 3mm hexagonal output shafts.

There are two ways to put the kit together: with a high-speed 58:1 gear ratio or with a slower 203:1 gear ratio.

The Tamiya 70110 4-speed crank-axle gearbox has four possible gear ratios, including the highest gear ratio of Tamiya’s gearbox series, 5402:1, as well as 126:1, 441:1, and 1543:1.

This gearbox also features a worm gear, which locks the output shaft when the motor is not turning.

A clutch gear prevents the gearbox from destroying itself in case the output shaft gets stuck.

The kit comes with all parts necessary to build the gearbox in any of the four possible configurations.