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Full machine-readable index: https://core-electronics.com.au/llms.txt # Tamiya 70097 Twin-Motor Gearbox Kit **Type:** Product page · **SKU:** POLOLU-61 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/tamiya-70097-twin-motor-gearbox-kit.html ([markdown](https://core-electronics.com.au/tamiya-70097-twin-motor-gearbox-kit.html.md)) Tamiya’s twin-motor gearbox consists of two independent brushed DC motors and gearboxes in one compact housing, making it perfect for small robots. You can assemble the gearboxes to have a 58:1 or a 204:1 gear ratio. ## Pricing - **Price:** $27.90 (inc GST) — $25.36 AUD, exc GST - **Quantity discounts:** 10+ $24.35 (exc GST) · 25+ $23.59 (exc GST) ## Availability & dispatch - In stock, ships same business day if ordered before 2PM (Australia/Sydney). - We can dispatch 1 today, and up to 60 more in 4–7 days. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=POLOLU-61:1` (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-61:1.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/0J2711_324906a7295.jpg)](https://core-electronics.com.au/attachments/localcontent/0J2711_225596cb587.jpg) | |---| | Tank-style chassis built using the Tamiya 70100 track and wheel set, Tamiya 70098 universal plate set, and Tamiya 70097 twin-motor gearbox kit. | #### Overview The Tamiya twin-motor gearbox is a small (3-inch long) plastic gearbox. It contains two small brushed DC motors that drive separate 3mm hexagonal output shafts. There are two ways to put the kit together: with a high-speed 58:1 gear ratio or with a slower 203:1 gear ratio. Either way, the motors provide plenty of power to drive any small robot. For a gearbox with a similar form factor and more gear ratio options, see the[Tamiya double gearbox](https://core-electronics.com.au/tamiya-70168-double-gearbox-kit.html). #### 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](https://core-electronics.com.au/category/35/tamiya-wheels) Pololu carry, giving you many options for your robot speed. The two 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 the motor in this kit with a [lower-current, higher-voltage motor](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). #### Comparison to the Tamiya double gearbox | [![](https://core-electronics.com.au/attachments/localcontent/0J2739_2040550ac4b.jpg)](https://core-electronics.com.au/attachments/localcontent/0J2739_67497774a08.jpg) | |---| The twin-motor gearbox is very similar to the [Tamiya 70168 double gearbox](https://core-electronics.com.au/tamiya-70168-double-gearbox-kit.html), as shown in the picture to the right. The gear ratio options of the two products complement each other well, but the mounting holes and overall dimensions vary slightly. The double gearbox is shorter and wider than the twin-motor gearbox, and the gears are a bit smaller and wider. This should make the double gearbox a bit more robust, though Pololu have not heard any reports of the twin-motor gearbox gears breaking. To compare all Tamiya gear box kits, see the Tamiya Gearbox Gear Ratio Comparison. **Note:** The twin-motor gearbox 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 70145 Narrow Tire Set (2 tires)](https://core-electronics.com.au/attachments/localcontent/0J226_279093ace2.jpg)](https://core-electronics.com.au/tamiya-70145-narrow-tire-set-2-tires.html) | [Tamiya 70145 Narrow Tire Set (2 tires)](https://core-electronics.com.au/tamiya-70145-narrow-tire-set-2-tires.html) | |---|---| | [![Tamiya 70101 Truck Tire Set (4 tires)](https://core-electronics.com.au/attachments/localcontent/0J227_3491b68107.jpg)](https://core-electronics.com.au/tamiya-70101-truck-tire-set-4-tires.html) | [Tamiya 70101 Truck Tire Set (4 tires)](https://core-electronics.com.au/tamiya-70101-truck-tire-set-4-tires.html) | |---|---| | [![Tamiya 70144 Ball Caster Kit (2 casters)](https://core-electronics.com.au/attachments/localcontent/0J263_3658dbdf90.jpg)](https://core-electronics.com.au/tamiya-70144-ball-caster-kit-2-casters.html) | [Tamiya 70144 Ball Caster Kit (2 casters)](https://core-electronics.com.au/tamiya-70144-ball-caster-kit-2-casters.html) | |---|---| **General specifications** | Typical operating voltage: | 3 V | |---|---| | Gear ratio options: | 58, 204 :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[3](https://core-electronics.com.au/#note3) | | Color: | gray | **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.3A theoretical torque of the gearbox output shaft can be computed by multiplying this torque by 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_70097_twin_motor_gearbox_kit__pololu_61__00.jpg)