70093 Tamiya 3-Speed Crank Axle Gearbox

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The 70093 Tamiya 3-Speed Crank Axle Gearbox can be geared for power or speed.

The Tamiya 3-speed crank-axle gearbox is essentially half of the twin-motor gearbox (70097). The kit comes with enough parts so you can built the gearbox in any of three gear ratios (17:1, 58:1, and 204:1).

Color options

  • 70093 3-speed crank-axle gearbox  —  This gearbox is solid gray and comes packaged in a box.
  • 89914 3-speed crank-axle gearbox  —  This gearbox is clear and comes packaged in plastic bag.

Complementary products

The output shafts included in this kit are 3 mm hexagonal axles that are 10 cm (about four inches) from tip to tip. The axles work with any of the Tamiya wheels we carry, giving you many options for your robot speed. The low-voltage motors run on 3-6 volts and draw up to a few amps, making them perfect candidates for the Pololu low-voltage dual serial motor controller and the DRV8833 motor driver carrier (2130-POLOLU). Motor overheating can be caused by excessive stalling, even at very low voltages. We recommend that you use stall-detection sensors, or just watch your robot, to make sure that it doesn’t stall for more than a few seconds at a time. For motor specs, see the Mabuchi motor FA-130 (#18100) data sheet (58k pdf).

Note that you can replace the motor in this kit with a lower-current, higher-voltage motor (1117-POLOLU) if you want to use this gearbox with controllers such as the qik 2s9v1 dual serial motor controller (1110-POLOLU), TB6612FNG dual motor driver carrier, or Baby Orangutan B-328 robot controller.

Typical operating voltage:

3 V

Gear ratio options:

17, 58, 204 :1

Free-run motor shaft speed @ 3V:

12300 rpm1

Free-run current @ 3V:

150 mA2

Stall current @ 3V:

2100 mA

Motor shaft stall torque @ 3V:

0.5 oz·in3




1- A theoretical speed of the gearbox output shaft can be computed by dividing this speed by the gear ratio.
2- This is the no-load current of the motor when disconnected from the gears in the gearbox; the no-load current of the entire gearbox with the motor connected will be slightly higher and will vary depending on the gear ratio.
3- A theoretical torque of the gearbox output shaft can be computed by multiplying this torque by the gear ratio.
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