CNC Machined Aluminum Robot Joint Housing
Custom CNC machined aluminum robot joint housings for arm segments and joint modules. Run on five axes with the bearing bores and seal grooves cut from one datum, so the joint turns on a single axis and the arm carries payload instead of its own structure.
- Bore Concentric to 0.01 mm
- Ribbed Thin-Wall Body
- Seal Grooves Machined
- Weight Optimized
*Send the joint torque and the cable route, because the rib layout and the cable path decide how much wall can be removed without losing stiffness.
Aluminum Robot Joint Housing Overview
A robot joint housing is the structure between two arm segments. It carries the joint torque, holds the bearing on one axis and routes the cable without chafing it, all while being as light as the payload allows.
The body is milled from a billet on five axes, with the outside profile and the inside core cut so the wall is even. Bearing bores and seal grooves are cut from one datum, which keeps the joint on a single axis and stops the arm from tracking a curve when it rotates.
6061-T6 Aluminum Bar
6061-T6 round bar is the starting point for housings and discs that are turned before they are milled. The bar is centred once, so the bore, the outer diameter and the flange face share one axis, and the milling that follows is referenced to that axis rather than to an edge.
7075-T6 Aluminum Disc
7075-T6 disc stock is chosen when the part is thin, runs fast or carries a bearing. The higher strength lets a 6 mm web hold a bore without a boss, and the machined surface takes a hard anodized layer without the orange-peel that softer alloys show.
Weight and stiffness trade directly. A 3 mm wall with ribs carries the same torque as a 6 mm solid wall at half the mass, but only if the ribs run along the load path rather than across it.
Aluminum Robot Joint Housing Specifications
Machining data for joint housings, agreed against the joint torque, the cable route and the bearing stack.
| Specification | Machining Data | Specification | Machining Data |
|---|---|---|---|
| Product | Robot Joint Housing / Arm Segment Body | Machining Process | 5-Axis CNC Milling, CNC Boring |
| Material | 6061-T6 / 7075-T6 Aluminum | Typical Tolerance | ±0.02 mm on Bore, ±0.05 mm on Flange |
| Housing Size | 80 × 80 mm to 400 × 300 mm | Concentricity | 0.01 mm Across Bearing Bores |
| Wall Thickness | 3 – 10 mm | Perpendicularity | 0.02 mm Flange to Bore |
| Bearing Bore | 20 – 180 mm, H7 | Surface Finish | Ra 1.6 µm, Ra 0.8 on Bores |
| Features | Ribbed Walls, Seal Grooves, Cable Path, Motor Mount | Drawing Format | STEP, STP, IGES, X_T, DWG, DXF, PDF |
| Customization | Cable Route, Motor Interface, Rib Layout, Colour | Lead Time | 10 – 16 Days (Prototype), 20 – 30 Days (Batch) |
| Inspection | CMM Coaxiality, Bore Gauge, Wall Scan | Packing | Foam Cradled, Bore Capped, Carton |
| Weight Range | 0.8 – 12 kg Finished | Anodizing | Type II 15 – 20 µm |
Key Features of Our CNC Machined Joint Housings
Light where the load allows, rigid where the joint turns.
Five-Axis Profile Machining
The outer profile and the internal core are cut on five axes in one set-up, so the wall stays even around the joint and the weight comes off where it does not carry load.
Bearing Bores on One Axis
Both bores are cut from the same datum, so the joint turns on a single axis and the arm does not track a curve as it rotates.
Cable Path Machined In
The cable route is machined into the body with radiused entries, so the harness does not chafe as the joint moves through its range.
Seal Grooves Cut to Drawing
Seal grooves are cut last, from the finished face, so the compression is what the drawing specifies rather than what the rough stock allowed.
Arm that drifts or chafes its cable?
Surface Finishes for CNC Machined Joint Housings
The finish on a joint housing is both cosmetic and functional, so bores and grooves are protected separately.
| Finish | Main Purpose | Finish | Main Purpose |
|---|---|---|---|
| As Machined | Bare body where it sits under an arm cover | Type II Anodizing | Corrosion protection and colour on the arm |
| Hard Anodizing | Wear resistance on the seal and bearing lands | Bead Blasting | Matte face before dyeing |
| Masked Bores | Bearing bores left bare to hold the H7 fit | Laser Marking | Joint number and axis direction |
*Anodizing adds 15 to 20 µm and closes a bore. Bearing bores and seal grooves are masked before the bath, or cut oversize by the coating thickness where masking is impractical.
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CNC Machining Process for Aluminum Joint Housings
The body is machined from a billet and cored from the inside, so the arm loses weight where it does not carry load.
01. Torque and Route Review
Check the joint torque, the bearing stack and the cable route against the wall thickness, and adjust the rib layout where the torque is highest.
02. Billet and Roughing
Select billet with stock on all faces, rough the outer profile and the internal core, then let the part relax before the finishing passes.
03. Five-Axis Finishing
Finish the outer profile, the bores and the cable path in one set-up, keeping the tool normal to the surface so the wall thickness stays even around the joint.
04. Grooves and Coating
Cut the seal grooves from the finished face, break the cable path edges, then mask the bores and anodize to the agreed colour.
05. Inspection and Packing
Check coaxiality, flange squareness and wall thickness on a CMM, cap the bores, and pack with foam so the anodized faces are not marked.
Have a joint that drifts under load or a cable that wears through? Send the joint drawing and the cable route, and we will quote the housing that fixes it.
CNC Machined Aluminum Robot Joint Housing FAQs
A ribbed 3 mm wall typically saves 35 to 45 percent against a 6 mm solid wall while holding the same torque, provided the ribs follow the load path between the bearing bosses.
The outer profile, the internal core and the cable path are not reachable in one three-axis set-up. Five-axis machining cuts them without re-clamping, which keeps the wall even and the bores on one axis.
Yes. The route is cut with radiused entries and a smooth floor, so the harness does not chafe as the joint sweeps through its range.
Bearing bores and seal grooves are masked before the bath, or cut oversize by the coating thickness where masking is not practical, so the H7 fit survives.
Yes, when both halves are quoted together. Machining both from one datum is what keeps the joint axis aligned across the arm.
Ten to sixteen days for a single housing including five-axis programming, machining, coating and inspection. Batches of 20 or more run twenty to thirty days.
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