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Full machine-readable index: https://core-electronics.com.au/llms.txt # Tamiya 72001 Planetary Gearbox Kit **Type:** Product page · **SKU:** POLOLU-70 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/tamiya-72001-planetary-gearbox-kit.html ([markdown](https://core-electronics.com.au/tamiya-72001-planetary-gearbox-kit.html.md)) The first in Tamiya’s “high efficiency” series, the planetary gearbox features two 4:1 and two 5:1 stages that can be combined in any way you like—you can even combine two kits to get really huge gear ratios. The output is always conveniently on the same axis as the motor shaft. Available gear ratios are 4:1, 5:1, 16:1, 20:1, 25:1, 80:1, 100:1, and 400:1. ## Pricing - **Price:** $55.95 (inc GST) — $50.86 AUD, exc GST - **Quantity discounts:** 6+ $48.83 (exc GST) · 12+ $47.30 (exc GST) ## Availability & dispatch - In stock, ships same business day if ordered before 2PM (Australia/Sydney). - We can dispatch 3 today, and up to 31 more in 4–7 days. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=POLOLU-70:1` (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-70:1.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/0J3661_83399f0904.jpg)](https://core-electronics.com.au/attachments/localcontent/0J3661_13072ce681f.png) | |---| | Tamiya 72001 planetary gearbox dimensions (in mm). | The first in Tamiya’s “high efficiency” series, the planetary gearbox features two 4:1 and two 5:1 stages that can be combined in any way you like—you can even combine two kits to get really huge gear ratios. The output is always conveniently on the same axis as the motor shaft. Available gear ratios are 4:1, 5:1, 16:1, 20:1, 25:1, 80:1, 100:1, and 400:1. The low-voltage motors in the planetary gearbox 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. This gearbox has a 4 mm diameter, round output shaft, which works with the [wheels that are compatible with Tamiya 4 mm, round shafts](https://core-electronics.com.au/category/99/wheels-compatible-with-tamiya-4mm-round-shafts). Pololu's [3 mm universal mounting hub](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-3mm-shaft-4-40-holes-2-pack.html) also fits on the smaller threaded end of the shaft, although it is not specifically intended to work with this type of shaft (the hub’s set screw could damage the thread on the shaft). For motor specs, see the Mabuchi motor RC-260 (#2295) data sheet (60k pdf). To compare all Tamiya gear box kits, see the Tamiya Gearbox Gear Ratio Comparison. **Note:** The planetary 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 70097 Twin-Motor Gearbox Kit](https://core-electronics.com.au/attachments/localcontent/0J4708_42229d371e.jpg)](https://core-electronics.com.au/tamiya-70097-twin-motor-gearbox-kit.html) | [Tamiya 70097 Twin-Motor Gearbox Kit](https://core-electronics.com.au/tamiya-70097-twin-motor-gearbox-kit.html) | |---|---| | [![Tamiya 70103 Universal Gearbox Kit](https://core-electronics.com.au/attachments/localcontent/0J278_2846056d10.jpg)](https://core-electronics.com.au/tamiya-70103-universal-gearbox-kit.html) | [Tamiya 70103 Universal Gearbox Kit](https://core-electronics.com.au/tamiya-70103-universal-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: | 4.5 V | |---|---| | Gear ratio options: | 4, 5, 16, 20, 25, 80, 100, 400 :1 | | No-load motor shaft speed @ 3V: | 6800 rpm[1](https://core-electronics.com.au/#note1) | | No-load current @ 3V: | 130 mA[2](https://core-electronics.com.au/#note2) | | Stall current @ 3V: | 2.5 A | | Motor shaft stall torque @ 3V: | 1.2 oz·in[3](https://core-electronics.com.au/#note3) | **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. **File downloads** - **Mabuchi motor RC-260 datasheet (see model #2295) (60k pdf)** ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/t/a/tamiya_72001_planetary_gearbox_kit__pololu_70__00.jpg)