> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt # 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. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=POLOLU-69:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/POLOLU-69:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## 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)