Pololu 67 Tamiya’s 3-speed crank-axle gearbox looks very much like half of the twin-motor gearbox (with an added gear ratio option). This compact gearbox can be built in one of three gear ratios (17:1, 58:1, and 204:1).

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 DRV8833 motor driver carrier.

Note: 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.

Specifications:

• Typical operating voltage: 3 V
• Gear ratio options: 17, 58, 204 :1
• No-load motor shaft speed @ 3V: 12300 rpm
• No-load current @ 3V: 150 mA
• Stall current @ 3V: 2100 mA
• Motor shaft stall torque @ 3V: 0.5 oz·in
• Color: gray

Documents:

• Datasheet
• Tamiya Gearbox Gear Ratio Comparison
• Tamiya Toy Motor Testing

Warranty:

• Warranty will not apply if Product fails or is damaged after delivery to you due to accident, abuse or misuse.

Package Includes:

• 1 x Pololu 67 Tamiya 70093 3-Speed Crank-Axle Gearbox Kit