# Tamiya 70103 Universal Gearbox Kit

**Type:** Product page · **SKU:** POLOLU-69 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia)
**Page:** https://core-electronics.com.au/tamiya-70103-universal-gearbox-kit.html ([markdown](https://core-electronics.com.au/tamiya-70103-universal-gearbox-kit.html.md))

Unlike the other gearboxes in Tamiya’s series, the universal gearbox has a thin metal frame, making it the smallest Tamiya gearbox. The final two gears are metal, making for a tough output. A worm gear allows for the high gear ratio options of 101:1, 269:1, and 719:1.

## Pricing

- **Price:** $25.50 (inc GST) — $23.18 AUD, exc GST
- **Quantity discounts:** 10+ $22.25 (exc GST) · 25+ $21.56 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 19 and Aug 24.

## Description

| [![](https://core-electronics.com.au/attachments/localcontent/0J3290_10844b73b2b.jpg)](https://core-electronics.com.au/attachments/localcontent/0J3290_30994fba684.jpg) |
|---|
| Tamiya 70103 Universal Gearbox Kit dimensions in mm. |

Tamiya 70103 universal gearbox has a thin, compact, metal frame, making it the smallest Tamiya gearbox. The final two gears are metal, making for a tough output. A worm gear allows for the high gear ratio options of 101:1, 269:1, and 719:1. The main output shaft can be oriented in four different directions, and a small, auxiliary output shaft turns perpendicularly to the main output shaft.

The output shafts 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](https://core-electronics.com.au/category/35/tamiya-wheels) Pololu 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](https://core-electronics.com.au/drv8833-dual-motor-driver-carrier.html). Motor overheating can be caused by excessive stalling, even at very low voltages. Pololu 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 this motor with a [lower-current, higher-voltage version](https://core-electronics.com.au/brushed-dc-motor-130-size-6v-11-5krpm-800ma-stall.html) if you want to use this gearbox with controllers such as the [qik 2s9v1 dual serial motor controller](https://core-electronics.com.au/pololu-qik-2s9v1-dual-serial-motor-controller.html), [TB6612FNG dual motor driver carrier](https://core-electronics.com.au/tb6612fng-dual-motor-driver-carrier.html), or [Baby Orangutan B-328 robot controller](https://core-electronics.com.au/baby-orangutan-b-328-robot-controller.html).

To compare all Tamiya gear box kits, see the Tamiya Gearbox Gear Ratio Comparison.

**Note:** The universal gearbox kit is a *kit*; assembly is required. To use the kit in robotics projects, you need to connect the motors to your own robot controller.

**People often buy this product together with:**

| [![Tamiya 70110 4-Speed Crank-Axle Gearbox Kit](https://core-electronics.com.au/attachments/localcontent/0J265_35920919ca.jpg)](https://core-electronics.com.au/tamiya-70110-4-speed-crank-axle-gearbox-kit.html) | [Tamiya 70110 4-Speed Crank-Axle Gearbox Kit](https://core-electronics.com.au/tamiya-70110-4-speed-crank-axle-gearbox-kit.html) |
|---|---|

| [![Tamiya 72001 Planetary Gearbox Kit](https://core-electronics.com.au/attachments/localcontent/0J281_30895a8775.jpg)](https://core-electronics.com.au/tamiya-72001-planetary-gearbox-kit.html) | [Tamiya 72001 Planetary Gearbox Kit](https://core-electronics.com.au/tamiya-72001-planetary-gearbox-kit.html) |
|---|---|

| [![Tamiya 72004 Worm Gearbox Kit](https://core-electronics.com.au/attachments/localcontent/0J268_31183722c6.jpg)](https://core-electronics.com.au/tamiya-72004-worm-gearbox-kit.html) | [Tamiya 72004 Worm Gearbox Kit](https://core-electronics.com.au/tamiya-72004-worm-gearbox-kit.html) |
|---|---|

**General specifications**

 | Typical operating voltage: | 3 V |
|---|---|
| Gear ratio options: | 101, 269, 719 :1 |
| No-load motor shaft speed @ 3V: | 12300 rpm[1](https://core-electronics.com.au/#note1) |
| No-load current @ 3V: | 150 mA[2](https://core-electronics.com.au/#note2) |
| Stall current @ 3V: | 2100 mA |
| Motor shaft stall torque @ 3V: | 0.5 oz·in |

**Notes:**

1A theoretical speed of the gearbox output shaft can be computed by dividing this speed by the gear ratio.2This 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. **Documentation and other information**

- ![](https://core-electronics.com.au/attachments/localcontent/0J359_5820399a29.jpg)**Tamiya Gearbox Gear Ratio Comparison**
    
    Table comparing the gear ratios available in the many different Tamiya gearboxes Pololu carry.
- ![](https://core-electronics.com.au/attachments/localcontent/0J323_208447dbc8.jpg)**Tamiya “Toy” Motor Testing by Adam Borrell (a.k.a nexisnet) (Printable PDF)**
    
    Adam, who posts under the username nexisnet on the Pololu forums, has performed a detailed series of experiments to determine how operating voltage affects the lifetime of the Mabuchi FA-130 motor, which happens to be the motors used in the Tamiya 70168 Double Gearbox, 70167 Single Gearbox (4-Speed), 70097 Twin-Motor Gearbox, 70093 3-Speed Crank-Axle Gearbox, 70110 4-Speed Crank-Axle Gearbox, and 70103 Universal Gearbox.
 
**File downloads**

- **Mabuchi motor FA-130 datasheet (see model #18100) (58k pdf)**

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/t/a/tamiya_70103_universal_gearbox_kit__pololu_69__00.jpg)