> **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 # Micro Gripper Kit with Position Feedback Servo **Type:** Product page · **SKU:** POLOLU-3551 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/micro-gripper-kit-with-position-feedback-servo.html ([markdown](https://core-electronics.com.au/micro-gripper-kit-with-position-feedback-servo.html.md)) This small gripper uses a rack and pinion design with a servo-driven pinion and opposing racks to keep the gripper paddles synchronized and parallel to... ## Pricing - **Price:** $50.15 (inc GST) — $45.59 AUD, exc GST - **Quantity discounts:** 6+ $43.76 (exc GST) · 12+ $42.40 (exc GST) ## Availability & dispatch - Available with a lead time — expect dispatch between Aug 31 and Sep 02. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=POLOLU-3551:1` (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-3551:1.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/0J9232_101536c0273.gif) | |---| This small gripper uses a rack and pinion design with a servo-driven pinion and opposing racks to keep the gripper paddles synchronized and parallel to each other throughout its 32 mm range of motion. It includes a special micro servo with an additional wire that gives access to its feedback potentiometer, so you can track the actual position of the gripper paddles. This is the same gripper used in the [Robot Arm Kit for Romi](https://core-electronics.com.au/robot-arm-kit-for-romi.html), and assembly instructions can be found in the Robot Arm Kit for Romi User’s Guide. Please note that the full range of the Micro Gripper requires servo control pulses between 0.5 ms (fully open) and 2.4 ms (fully closed), which is well beyond the standard hobby servo range 1 ms to 2 ms, so you should make sure your control electronics are capable of generating such signals if you care about getting the full range. Due to unit-to-unit variations in the servos, you might need to adjust these values for your particular gripper. The servo is intended to be powered from 4.8 V to 6 V (nominal) battery packs or a suitable power supply in that general range, and it has a stall current of around 800 mA at 6 V. The feedback voltage ranges linearly from around 0.5 V (fully open) to 2.2 V (fully closed), meaning that there is an approximately 1:1 correspondence between servo position in microseconds and the feedback voltage in millivolts. **Dimensions of the Micro Gripper with Position Feedback Servo** | [![](https://core-electronics.com.au/attachments/localcontent/0J9135_446261270e5.jpg)](https://core-electronics.com.au/attachments/localcontent/0J9135_6706432eaed.png) | |---| This diagram is also available as a **downloadable PDF** (318k pdf). **Kit contents** | [![](https://core-electronics.com.au/attachments/localcontent/0J9229_3757380af2b.jpg)](https://core-electronics.com.au/attachments/localcontent/0J9229_258992b8378.jpg) | |---| - One micro servo with position feedback - One top micro gripper case - One bottom micro gripper case - One micro gripper plate - One micro gripper pinion gear - Two micro gripper paddles with rack **People often buy this product together with:** | [![Micro Maestro 6-Channel USB Servo Controller (Assembled)](https://core-electronics.com.au/attachments/localcontent/0J1951_59595b5951.jpg)](https://core-electronics.com.au/micro-maestro-6-channel-usb-servo-controller-assembled.html) | [Micro Maestro 6-Channel USB Servo Controller (Assembled)](https://core-electronics.com.au/micro-maestro-6-channel-usb-servo-controller-assembled.html) | |---|---| | [![Pololu USB AVR Programmer v2.1](https://core-electronics.com.au/attachments/localcontent/0J8584_4309b1dc95.jpg)](https://core-electronics.com.au/pololu-usb-avr-programmer-v2-1.html) | [Pololu USB AVR Programmer v2.1](https://core-electronics.com.au/pololu-usb-avr-programmer-v2-1.html) | |---|---| | [![Robot Arm Kit for Romi](https://core-electronics.com.au/attachments/localcontent/0J9183_2906af12e5.jpg)](https://core-electronics.com.au/robot-arm-kit-for-romi.html) | [Robot Arm Kit for Romi](https://core-electronics.com.au/robot-arm-kit-for-romi.html) | |---|---| **Dimensions** | Weight: | 30 g | |---|---| **General specifications** | Color: | black | |---|---| | Lead length: | 38 cm | **Documentation and other information** - **User’s guide for the Robot Arm Kit for Romi** Assembly instructions and user’s manual for the [Robot Arm Kit for Romi](https://core-electronics.com.au/robot-arm-kit-for-romi.html). (This also contains the assembly instructions for the [Micro Gripper Kit](https://core-electronics.com.au/prodJ3551), which is included as part of the Romi Arm Kit but is also a standalone product.) **File downloads** - **Dimension diagram of the Micro Gripper with Position Feedback Servo (318k pdf)** - **3D model of the assembled Micro Gripper Kit with Position Feedback Servo (7MB step)** ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/i/m/image_4457.jpg)