Turn-Mill Machined Robot Joint Housing with Reducer Cavity in 6061 Aluminum for Precision Robot Joint Casing

Reducer cavity and bearing bore machined to ±0.01 mm in a single turn-mill setup — keeping the cavity concentric with the bore and the mounting faces square to the joint axis.

• ±0.01 mmCavity, bore & mounting faces
• Turn-MillOne setup, no re-chucking error
• MOQ 1 PieceNo tooling charge, prototype ready

• ISO 9001:2015
• 6061-T6 Aluminum
• CMM Report per Batch
• NDA Available
• Exporting Since 2008

This robot joint housing is turn-mill machined from 6061 aluminum by Dongguan Changxinda Precision Technology Co., Ltd., a CNC factory established in 2008. The reducer cavity, the bearing bore and the mounting faces are all cut in one setup, so the cavity stays concentric with the bore and the faces stay square to the joint axis. Critical dimensions are held to ±0.01 mm and verified on a CMM.

A joint housing is where the reducer, the bearing and the arm all meet. If the cavity and the bearing bore are cut in separate setups, the accumulated error shows up as runout at the arm tip and as uneven gear contact inside the reducer. Machining both features in one clamping keeps them on a shared axis, and finishing the mounting faces in the same setup keeps the joint square when it is bolted to the next link.

Each joint housing follows a controlled eight-stage route:

1. Drawing review & DFM: STEP / IGES / SolidWorks / 2D PDF checked for cavity geometry, bearing seats, wall thickness and mounting interface.
2. Material: 6061-T6 aluminum with mill certificates; billet or extruded stock depending on wall section.
3. Turn-mill programming: CAM toolpaths built so the cavity, bore and faces are reachable without re-chucking.
4. Rough machining: stock removed from cavity and outer profile with allowance for stress movement.
5. Semi-finish: walls equalised to reduce chatter on thin sections.
6. Finish boring the cavity and bearing seat: roundness and cylindricity held to ±0.01 mm, checked with a bore gauge during the run.
7. Faces, holes & threads: mounting faces milled square in the same setup, tapped holes positioned from the joint axis.
8. CMM inspection: cavity diameter, bore concentricity, perpendicularity and hole positions recorded in a report.

The housing shown is a starting point. We machine custom joint housings with your own cavity size, bearing bore, flange pattern, wall thickness and motor interface — all to drawing.

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 housing stay dedicated to your program, and surplus or reject parts are scrapped on request.

Changxinda runs a plant established in 2008 with 90+ staff, CNC lathes and 4-axis / 5-axis machining centers backed by a dedicated QC lab.

One shop, ten industries, one inspection standard:

• 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.

• Reducer cavity and bearing bore machined in one setup
• ±0.01 mm on cavity diameter, bore and face squareness
• 6061-T6 aluminum with mill certificates
• Roundness and cylindricity checked with a bore gauge
• Thin-wall sections machined without chatter
• Mounting faces finished square to the joint axis
• Tapped holes positioned from a common datum
• Anodizing, hard coat or per drawing
• NDA and IP protection on request
• From 1-piece prototypes to scheduled production