One-Piece Billet Robot Arm Joint Housing with 5-Axis Simultaneous Machining and Dual Coaxial Bearing Bores
Humanoid Joint Housing Billet
,5-Axis Joint Housing Machining
,One-Piece Billet Aluminum Housing
- One-Piece Billet Dual bearing bores at 0.01 mm
- Precision 0.01 mm on bores & mounting faces
- Process 5-axis billet — no welds, no bolts
- Min Order 1 piece — no tooling charge
ISO 9001:2015 • 6061-T6 / 7075 billet aluminum • CMM first-article report • NDA on request • Exporting since 2008
This humanoid robot arm joint housing is machined by Dongguan Changxinda Precision Technology Co., Ltd., a CNC factory established in 2008. The housing is cut from a single solid billet of 6061-T6 or 7075 aluminum on 5-axis machining centers — no welds, no bolted joints — so the dual bearing bores, mounting flanges and internal features are all tied to one datum. Critical features are held to ±0.01 mm and verified on a CMM, giving the humanoid arm the rigidity and repeatability its motion relies on.
A joint housing is the structural heart of a robot arm. Its two bearing bores must stay coaxial along the joint axis so the arm rotates without play, and its mounting flanges must sit flat and square to the bores so the servo and reducer align correctly. Machining the whole housing from one billet keeps those relationships true, and removes the weight and joint stiffness losses that come from assembling separate parts.
One-piece billet housings demand a controlled route. Each housing follows an eight-stage process:
- Drawing review & DFM: STEP / IGES / SolidWorks / 2D PDF checked for bore coaxiality, wall thickness and tolerances.
- Billet selection: 6061-T6 / 7075 aluminum billet with mill certificates.
- 5-axis programming: simultaneous toolpaths and fixtures designed to reach deep pockets and both bores.
- Roughing: staged stock removal to limit distortion before finish.
- Boring & finishing: dual bearing bores finished for coaxiality, roundness and fit.
- Deburr & edge break: internal cavity and bore edges cleaned for assembly and fatigue life.
- Surface treatment: hard anodizing, mirror polish or per drawing.
- CMM inspection: bores, flanges and cavities verified with a first-article report.
The dual-bore humanoid joint housing is a starting point. We machine custom joint housings with your own bore diameters, flange patterns, cavity shapes and wall thickness — all to drawing.
Humanoid robot designs are often confidential. We sign an NDA before engineering review, restrict drawings to the assigned programming and machining team, and never display or reuse customer geometry. Fixtures and programs built for your part stay dedicated to your program, and surplus or reject parts are scrapped on request.
Changxinda runs a plant established in 2008 with 90+ staff, multiple 5-axis machining centers and turn-mill lathes backed by a dedicated QC lab.
One shop, ten industries, one inspection standard — from consumer devices to robot joints:
- Consumer ElectronicsPhone / tablet / laptop housings, heat sinks, camera brackets, VR/AR headset structural parts, smart wearable shells.
- Automation & Industrial EquipmentAutomation fixtures, jigs, module frames, transmission sliders, motor mounts, sensor housings, assembly line components.
- Semiconductor & Vacuum EquipmentVacuum chambers, vacuum fittings, precision bases for semiconductor equipment, thermal and insulating parts, inspection tooling.
- Medical EquipmentSurgical instrument bases, medical testing instrument housings, endoscope accessories, medical aesthetic device structural parts (medical-grade aluminum / stainless steel).
- AutomotiveNew-energy motor housings, battery end plates, sensor brackets, headlamp structural parts, modified parts, hydraulic valve blocks.
- Aerospace & UAVAircraft structural parts, drone frames, landing gear accessories, aviation instrument housings (lightweight precision parts).
- Optics & PhotonicsOptical lens barrels, lens mounts and bases, light source heat sinks, camera module brackets, inspection optical platforms.
- Communications5G heat dissipation cavities, filter parts, signal adapter structural parts, communication equipment housings.
- RoboticsRobotic arm joint parts, robot bases, reducer housings, AGV structural parts.
- Instruments & MetersTesting equipment housings, precision gauge bases, flow meter parts, laboratory equipment accessories.
- One-piece 5-axis billet machining — no welds, no bolted joints
- ±0.01 mm on dual bearing bores and mounting faces
- 6061-T6 / 7075 aluminum billet with mill certificates
- Coaxial dual bearing bores for smooth joint rotation
- Deep pocket weight reduction without losing stiffness
- Flat, square flanges for servo and reducer alignment
- Hard anodizing, mirror polish and custom finishes
- NDA and IP protection on request
- CMM inspection with first-article report
- From 1-piece prototypes to scheduled production
| Product Type | Humanoid robot arm joint housing (one-piece billet) |
|---|---|
| Machining | 5-axis simultaneous machining |
| Tolerance | ±0.01 mm on critical features |
| Material | 6061-T6 / 7075 billet aluminum |
| Bearing Bores | Dual coaxial precision bores |
| Surface Finish | Hard anodizing / mirror polish / per drawing |
| Inspection | CMM + first-article report |
| MOQ | 1 piece |
| Lead Time | 3–7 days prototypes |
Q1: Why machine the joint housing from one billet?
A one-piece billet keeps the dual bearing bores and flange faces tied to one datum and removes bolted-joint play, giving higher stiffness and repeatability than an assembled housing.
Q2: How do you keep the dual bores coaxial?
Both bores are machined on the same 5-axis setup to one datum and finished for coaxiality, roundness and fit, then CMM-verified to ±0.01 mm.
Q3: Which materials do you machine?
6061-T6 and 7075 aluminum as standard, with stainless and titanium available on request. All material comes with mill certificates.
Q4: Can you match my humanoid arm design?
Yes — we machine to your 2D drawings or 3D models, including bore diameters, flange patterns, cavity shapes and wall thickness.
Q5: Will you sign an NDA?
Yes, before engineering review. Drawings are limited to the assigned programming and machining team and never reused or displayed.
Q6: What is the lead time?
Prototypes 3–7 days, small batches 7–14 days, mass production 14–30 days depending on complexity, with rush support available.
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