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70188 Mini Motor Gearbox (8-Speed) Kit

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Overview

The mini-motor gearbox kit from Tamiya makes it easy to get a small robot or plastic model moving. The kit includes one brushed DC motor and all the gears and parts to build any of the eight possible gear ratio configurations: 7.5:1, 9.5:1, 15.7:1, 19.9:1, 32.9:1, 41.8:1, 79.1:1, or 87.8:1. The eight gear ratio options give you the flexibility to choose the best speed and torque for your project. There are two possible output axle locations (only one output location is possible for any given ratio).

Parts included with the Tamiya 70188 mini motor gearbox (8-speed) kit with quarter for size reference.

The kit includes step-by-step illustrated instructions in both Japanese and English. A scanned copy of the instructions is available on the Pictures tab. The kit can be built with just a screwdriver, but the instructions recommend having side cutters, tweezers, and a modeling knife on hand. The gearbox kit’s motor has a 030 form factor that is smaller than the Tamiya gearboxes that use the Mabuchi FA-130 motor.

Box front for Tamiya mini motor gearbox (8-speed) kit.

Instructions for Tamiya mini motor gearbox (8-speed) kit page 2.

Box back for Tamiya mini motor gearbox (8-speed) kit shows the possible gear ratios in yellow.

Features

  • 030-form-factor motor
    • Speed @ 3 V: 8400 RPM
    • Free-run current @ 3 V: 60 mA
    • Stall current @ 3 V: 600 mA
    • Stall torque @ 3 V: see picture to the right for torque table
  • 8 different gear ratios, which can be adjusted by changing the pinion gear and final gear position
    • 7.5:1
    • 9.5:1
    • 15.7:1
    • 19.9:1
    • 32.9:1
    • 41.8:1
    • 79.1:1
    • 87.8:1
  • 3 mm hexagonal output shaft compatible with our adapter for LEGO wheels and many of Tamiya’s wheels.
  • Mounting holes designed to work with the Tamiya 70098 universal plate set and other Tamiya construction series products.
  • Transparent gear housing shows the internal mechanisms
  • Compact size of approximately 20 x 18 x 50 mm (0.8" x 0.7" x 2")

Note: The Tamiya 70188 mini motor gearbox (8-speed) is a kit; assembly is required.

Specifications

Typical operating voltage3 V
Gear ratio options7.5, 9.5, 15.7, 19.9,
32.9, 41.8, 79.0, 87.8 :1
No-load motor shaft speed @ 3V8400 rpm [1]
No-load current @ 3V60 mA [2]
Stall current @ 3V600 mA
Colorclear
  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.

This product was added to our catalog on October 10, 2009