{"product_id":"nexarm-metal-robot-arm-lerobot-imitation-learning","title":"Hiwonder NexArm All-Metal 6-Axis Robot Arm for LeRobot, 65 kg·cm Magnetic-Encoder Servos, 500 g Payload, Leader + Follower Imitation-Learning Kits","description":"\u003cp\u003e\u003cstrong\u003eNexArm is an all-metal, open-source 6-axis desktop robot arm from Hiwonder built for embodied-AI and imitation-learning work: it keeps the SO-ARM101 servo protocol and LeRobot compatibility but replaces printed plastic with aluminium, 65 kg·cm magnetic-encoder servos, a parallel-rail gripper, 500 g payload and ±2 mm repeatability for research that needs to run for hours without wobble.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNexArm is a step up from 3D-printed SO-101 arms: an all-metal desktop arm with 65 kg·cm magnetic-encoder servos, a 500 g payload and ±2 mm repeatability, while keeping the same servo protocol so it drops straight into Hugging Face LeRobot workflows. Buy a single follower for autonomous tasks, or the leader + follower kits with cameras for teleoperation, data collection and imitation learning.\u003c\/p\u003e\u003ch2\u003eWhat can you use it for?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eImitation learning and VLA policy training with Hugging Face LeRobot on more rigid hardware\u003c\/li\u003e\n\u003cli\u003eLeader–follower teleoperation and dual-view (wrist + overhead) dataset collection\u003c\/li\u003e\n\u003cli\u003ePick-and-place, stacking and sorting of real objects up to 500 g\u003c\/li\u003e\n\u003cli\u003eUniversity and corporate robotics labs that need repeatable, long-duration experiments\u003c\/li\u003e\n\u003cli\u003eUpgrading from SO-ARM101: same protocol, same workflows, metal body and stronger servos\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho is it for?\u003c\/h2\u003e\u003cp\u003eResearch groups, robotics educators and serious builders who have outgrown 3D-printed arms and want an affordable metal arm that still speaks LeRobot.\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSoftware: Hugging Face LeRobot (Feetech \/ SO-ARM101 protocol), Hiwonder PC host software (3D view, action groups, coordinate mode), Python API, ROS-compatible controller variants exist\u003c\/li\u003e\n\u003cli\u003eHosts: Windows or Ubuntu laptop, Raspberry Pi, NVIDIA Jetson\u003c\/li\u003e\n\u003cli\u003eCameras: included USB UVC cameras in the kits; any OpenCV webcam can be added\u003c\/li\u003e\n\u003cli\u003ePairing: one leader controls one follower; the follower alone can run trained policies or scripted motions\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003eHiwonder NexArm (imitation-learning version)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDegrees of freedom\u003c\/th\u003e\n\u003ctd\u003e6 (5 joints + parallel gripper)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStructure\u003c\/th\u003e\n\u003ctd\u003eAviation-grade aluminium alloy, hidden internal wiring, patented parallel linear-rail gripper with silicone pads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eServos\u003c\/th\u003e\n\u003ctd\u003eHX-65HM 65 kg·cm dual-shaft magnetic-encoder bus servos (base and shoulder), HX-30HM and HX-12H on the wrist and gripper; 12-bit encoders, 0.3° precision\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGear ratios\u003c\/th\u003e\n\u003ctd\u003eLeader arm 1:147 (light, fast to move by hand); follower arm 1:345 (torque and holding)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eReach \/ payload\u003c\/th\u003e\n\u003ctd\u003e500 mm working radius, 500 g rated payload, ±2 mm repeatability\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eJoint range\u003c\/th\u003e\n\u003ctd\u003eBase 270°, shoulder 200°, elbow 240° (see drawing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eController\u003c\/th\u003e\n\u003ctd\u003eESP32 + AT32 dual-chip board with OLED display, trapezoidal acceleration and curve-smoothing motion algorithms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCameras\u003c\/th\u003e\n\u003ctd\u003eBasic kit: 480p wrist camera with bracket; Deluxe kit adds 2 MP (1080p) wide-angle overhead camera on a metal stand\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eServo protocol\u003c\/th\u003e\n\u003ctd\u003eFully compatible with the SO-ARM101 \/ Feetech bus protocol, works unmodified with LeRobot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSoftware\u003c\/th\u003e\n\u003ctd\u003eHugging Face LeRobot (ACT, VLA), Hiwonder PC host software with 3D visualisation, action groups, coordinate control, Python API\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower\u003c\/th\u003e\n\u003ctd\u003e12 V DC adapter per arm (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat's in the box\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFollower arm (assembled, with gripper):\u003c\/strong\u003e 1 × NexArm follower arm with parallel gripper, ESP32 + AT32 controller, 12 V adapter, USB cable, documentation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeader arm (assembled, with handle):\u003c\/strong\u003e 1 × NexArm leader arm with handle, controller, 12 V adapter, USB cable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImitation-Learning Basic Kit (leader + follower + wrist camera):\u003c\/strong\u003e 1 × follower arm, 1 × leader arm, wrist (first-person) camera with bracket, adapters, USB cables, documentation and tutorials\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImitation-Learning Deluxe Kit (+ overhead 2 MP camera and stand):\u003c\/strong\u003e Everything in the Basic Kit plus a 2 MP wide-angle overhead camera on a metal desk stand for third-person recording\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eHow is NexArm different from the SO-ARM101?\u003c\/h3\u003e\u003cp\u003eThe SO-ARM101 is 3D-printed PLA with 30 kg·cm servos; NexArm is aluminium with 65 kg·cm servos, a 500 mm reach, 500 g payload, ±2 mm repeatability, hidden wiring and a parallel linear-rail gripper. Both use the same servo protocol and work with LeRobot, so datasets, scripts and habits carry over.\u003c\/p\u003e\u003ch3\u003eDoes it work with Hugging Face LeRobot?\u003c\/h3\u003e\u003cp\u003eYes. NexArm is fully compatible with the SO-ARM101 servo protocol that LeRobot supports, and Hiwonder provides configs and a step-by-step course covering teleoperation, recording, ACT training and deployment.\u003c\/p\u003e\u003ch3\u003eWhich kit do I need?\u003c\/h3\u003e\u003cp\u003eFor imitation learning you need a leader and a follower: choose the Basic Kit (wrist camera) or the Deluxe Kit (wrist plus overhead camera, the setup used in most tutorials). A single follower arm is enough for running trained policies, scripted pick-and-place, or coordinate-mode control from the PC software.\u003c\/p\u003e\u003ch3\u003eWhat is the payload and accuracy?\u003c\/h3\u003e\u003cp\u003e500 g rated payload at a 500 mm working radius with ±2 mm repeatability, thanks to 12-bit magnetic encoders and trapezoidal-acceleration motion control.\u003c\/p\u003e\u003ch3\u003eIs it assembled?\u003c\/h3\u003e\u003cp\u003eYes. Every configuration ships assembled and factory-calibrated. Fix the base to the desk, connect 12 V power and USB, and it is ready.\u003c\/p\u003e\u003ch3\u003eWhy do the leader and follower have different gear ratios?\u003c\/h3\u003e\u003cp\u003eThe leader arm uses 1:147 servos so it is light and smooth to move by hand; the follower uses 1:345 servos for torque and holding. That is what makes teleoperation feel natural and the follower strong.\u003c\/p\u003e","brand":"Glunova Biotech","offers":[{"title":"Follower arm (assembled, with gripper)","offer_id":50758000443631,"sku":"NEXARM-FOLLOWER","price":483.0,"currency_code":"SGD","in_stock":true},{"title":"Leader arm (assembled, with handle)","offer_id":50758000476399,"sku":"NEXARM-LEADER","price":407.0,"currency_code":"SGD","in_stock":true},{"title":"Imitation-Learning Basic Kit (leader + follower + wrist camera)","offer_id":50758000509167,"sku":"NEXARM-BASIC","price":864.0,"currency_code":"SGD","in_stock":true},{"title":"Imitation-Learning Deluxe Kit (+ overhead 2 MP camera and stand)","offer_id":50758000541935,"sku":"NEXARM-DELUXE","price":927.0,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/5406\/2063\/files\/01_pair.jpg?v=1789401568","url":"https:\/\/armdojo.com\/products\/nexarm-metal-robot-arm-lerobot-imitation-learning","provider":"ArmDojo","version":"1.0","type":"link"}