> **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 # 228:1 Plastic Gearmotor, Offset Output **Type:** Product page · **SKU:** POLOLU-1118 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/228-1-plastic-gearmotor-offset-output.html ([markdown](https://core-electronics.com.au/228-1-plastic-gearmotor-offset-output.html.md)) This 228:1 gearbox with brushed DC motor has a low-current motor and provides power and speed that is comparable to an RC servo at a fraction of the cost. At 6 V, it has a free-run speed of 45 RPM and a stall torque of approximately 100 oz-in. Though the product picture shows two gearmotors, this product is for a single motor. ## Pricing - **Price:** $17.30 (inc GST) — $15.73 AUD, exc GST - **Quantity discounts:** 10+ $15.10 (exc GST) · 25+ $14.63 (exc GST) ## Availability & dispatch - Out of stock — the product page offers email notification when it returns. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=POLOLU-1118:1` (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-1118:1.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/0J9882_11198b83ce6.jpg)](https://core-electronics.com.au/attachments/localcontent/0J9882_15049b7cd67.jpg) | |---| | Inside the gearbox of the 228:1 plastic gearmotor with offset output. | This 228:1 plastic gearmotor (gearbox with brushed DC motor) is a great low-cost alternative to modified hobby servos or [Tamiya gearboxes](https://core-electronics.com.au/category/34/tamiya-motors-and-gearboxes). The low-current motor is a perfect match for Pololu's [qik 2s9v1 dual serial motor controller](https://core-electronics.com.au/pololu-qik-2s9v1-dual-serial-motor-controller.html), [Baby Orangutan robot controller](https://core-electronics.com.au/baby-orangutan-b-328-robot-controller.html), or [DRV8833 dual motor driver carrier](https://core-electronics.com.au/drv8833-dual-motor-driver-carrier.html), and the compact size makes this unit an attractive choice for small robot designs. The recommended operating voltage range for this motor is 3 V to 12 V. This is a higher-torque, lower-speed version of the [120:1 plastic gearmotor offset output](https://core-electronics.com.au/120-1-plastic-gearmotor-offset-output.html). At 6 V, the gearbox and motor provide approximately 100 oz-in of torque and 45 RPM. The free-running current is 70 mA, and the stall current is 800 mA. The gearbox is protected by a built-in safety clutch that will typically slip before gear teeth can shear. This gearmotor comes pre-assembled, with the gears fully enclosed, and the output shaft is 6 mm long and 7 mm in diameter with two sides flattened. The output shaft is along the same axis as the motor shaft, but offset; Pololu also sell a similar gearmotor with a [90° output shaft](https://core-electronics.com.au/200-1-plastic-gearmotor-90-output.html). There are two built-in mounting holes that work with Pololu's [stamped aluminum L-bracket](https://core-electronics.com.au/pololu-stamped-aluminum-l-bracket-pair-for-plastic-gearmotors.html) and [extended stamped aluminum L-bracket](https://core-electronics.com.au/pololu-extended-stamped-aluminum-l-bracket-pair-for-plastic-gearmotors.html), as shown in the pictures below: | \| [![](https://core-electronics.com.au/attachments/localcontent/0J5467_116275f6c9c.jpg)](https://core-electronics.com.au/attachments/localcontent/0J5467_486028df90e.jpg) \| \|---\| \| Plastic gearmotor with offset output (item #1118 or #1119) mounted with Pololu stamped aluminum L-bracket. \| | \| [![](https://core-electronics.com.au/attachments/localcontent/0J5460_14132e7c8ab.jpg)](https://core-electronics.com.au/attachments/localcontent/0J5460_48838c6265b.jpg) \| \|---\|---\| \| Plastic gearmotor with offset output (item #1118 or #1119) mounted with Pololu extended stamped aluminum L-bracket. \| | |---| This gearmotor is compatible with the [Solarbotics GMPW plastic wheel](https://core-electronics.com.au/solarbotics-gmpw-y-yellow-wheel.html), which is available in a variety of colors. **Details for item #1118** Exact gear ratio: 36×37×37×248×9×9×8≈228.1736×37×37×248×9×9×8˜228.1736×37×37×248×9×9×8˜228.17 This 228:1 gearbox with brushed DC motor has a low-current motor and provides power and speed that is comparable to an RC servo at a fraction of the cost. It has a recommended operating voltage range of 3 V to 12 V Key specifications: | voltage | no-load performance | stall extrapolation | |---|---|---| | 6 V | 45 RPM, 70 mA | 7.2 kg·cm (100 oz·in), 800 mA | **Dimensions** | [![](https://core-electronics.com.au/attachments/localcontent/0J10387_47679c13d63.jpg)](https://core-electronics.com.au/attachments/localcontent/0J10387_161529cefca.png) | |---| | Dimensions of the 120:1 and 228:1 plastic gearmotors with offset outputs. Units are mm over \[inches\]. | This diagram is also available as a [**downloadable PDF**](https://core-electronics.com.au/attachments/localcontent/pololu-plastic-gearmotor-offset-output-dimension-diagram_24216657f46.pdf) (242k pdf). **People often buy this product together with:** | [![Solarbotics GMW (GM2/3/8/9 Gear Motor Mount - ONE mount)](https://core-electronics.com.au/attachments/localcontent/0J2459_3865310262.jpg)](https://core-electronics.com.au/solarbotics-gmw-gm2-3-8-9-gear-motor-mount-one-mount.html) | [Solarbotics GMW (GM2/3/8/9 Gear Motor Mount - ONE mount)](https://core-electronics.com.au/solarbotics-gmw-gm2-3-8-9-gear-motor-mount-one-mount.html) | |---|---| | [![Brushed DC Motor: 130-Size, 6V, 11.5kRPM, 800mA Stall](https://core-electronics.com.au/attachments/localcontent/0J1101_3771faa02d.jpg)](https://core-electronics.com.au/brushed-dc-motor-130-size-6v-11-5krpm-800ma-stall.html) | [Brushed DC Motor: 130-Size, 6V, 11.5kRPM, 800mA Stall](https://core-electronics.com.au/brushed-dc-motor-130-size-6v-11-5krpm-800ma-stall.html) | |---|---| | [![200:1 Plastic Gearmotor, 90° Output](https://core-electronics.com.au/attachments/localcontent/0J9884_3124a31e41.jpg)](https://core-electronics.com.au/200-1-plastic-gearmotor-90-output.html) | [200:1 Plastic Gearmotor, 90° Output](https://core-electronics.com.au/200-1-plastic-gearmotor-90-output.html) | |---|---| **Dimensions** | Size: | 42 x 22.7 x 47.8 mm[1](https://core-electronics.com.au/#note1) | |---|---| | Weight: | 33 g | | Shaft diameter: | 7 mm | **General specifications** | Typical operating voltage: | 6 V | |---|---| | Gear ratio: | 228:1 | | No-load speed @ 6V: | 45 rpm | | No-load current @ 6V: | 70 mA | | Stall current @ 6V: | 800 mA | | Stall torque @ 6V: | 100 oz·in | **Notes:** 1 See drawing for detailed dimensions. **File downloads** - **[Dimension diagram of 120:1 and 228:1 Plastic Gearmotor, Offset Output](https://core-electronics.com.au/attachments/localcontent/pololu-plastic-gearmotor-offset-output-dimension-diagram_24216657f46.pdf) (242k pdf)** **Recommended links** - **[MATLAB script to plot motor performance curves for Pololu brushed DC gearmotors](https://www.mathworks.com/matlabcentral/fileexchange/54695-polulu-motor-plot-generator)** This MATLAB script, written by Ali Asgher Mansoor Habiby, plots speed, power, current draw, and efficiency as they vary with torque when you input the gearmotor specifications. It also prints the resistance of the motor, and the current draw and torque at which maximum efficiency and maximum power occur. ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/2/2/228_1_plastic_gearmotor_offset_output__pololu_1118__00.jpg)