Robot Joint Housing 6061 Aluminum Helical Weight Slots Turn-Mill Machined 0.006mm Concentricity
Helical Weight Slot Housing
,Turn-Mill Single Clamp Concentricity
,Thin Wall H7 Bearing Seat
What This Part Does
This joint housing carries the reducer and bearing stack of a robot articulation. The body is turned from 6061 aluminum plate as a thin cylinder, the weight-reduction slots are milled on a helix so they follow the load path instead of cutting across it, and the flange bolt circle, bore seat and mounting lugs are produced without releasing the part from the chuck. Wall sections are kept to 1.2-3 mm where the drawing allows, which pulls mass out of the moving joint while keeping hoop stiffness.
It suits designs that a standard pillow-block or catalogue housing cannot serve: an off-centre bore, an asymmetric lug pattern, an encoder window, a cable channel, or an oil-seal groove all sit inside the same envelope and are cut in the same operation.
Manufacturing Route
The route below is what we actually run for this housing family. Each stage exists to protect a dimension that would otherwise move later in the process.
Precision Capability
| Feature | Held To | How It Is Checked |
|---|---|---|
| Bore to flange concentricity | 0.006 mm | CMM, bore axis as datum |
| Bearing seat tolerance | H7 / G7 per drawing | Bore gauge, 100% of bores |
| Flange face runout | 0.008 mm | CMM scan of full face |
| Bore roundness | 0.004 mm | CMM form report |
| Bolt circle position | 0.02 mm | CMM, best-fit circle |
| Slot width repeatability | 0.03 mm | Pin gauge, sampled per batch |
| Bore surface finish | Ra 0.2-0.4 µm | Roughness tester, per batch |
| Wall thickness on lightened zone | 1.2 mm minimum | Ultrasonic spot check |
These are process capabilities, not catalogue claims. If your drawing asks for something tighter than the route above can hold reliably, we say so before quoting and propose an alternative process instead of accepting an order we cannot repeat.
Custom and Non-Standard Work
Every housing we ship is a one-off drawing made repeatable. Nothing here is limited to a catalogue size.
- Outer diameter 60-400 mm, bore 10-250 mm, overall length up to 300 mm
- Slot patterns: helical, axial, radial, crossed or customer-defined, with slot width from 3 mm
- Materials: 6061-T6, 6082-T6, 7075-T6, 2024-T351, 304/316L stainless, 4140, titanium on request
- Integrated features: encoder windows, cable channels, seal grooves, oil ports, keyways, heli-coils, dowel pin holes, laser marking
- Accepted input: STEP, IGES, X_T, STL, DXF, 2D drawing with GD&T, or a physical sample for 3D scanning and model rebuild
- Assembly support: matched housing and cover sets, bearing press-fit trials, first article fit check before mass production
Confidentiality
About the Plant
Dongguan Changxinda Precision Technology Co., Ltd has machined custom metal components since 2008. The floor runs 4-axis and 5-axis machining centres, turn-mill combination lathes, CNC lathes and milling machines, with an ISO 9001:2015 quality system and an in-house CMM room. More than 200 customers in medical equipment, robotics, automotive, aerospace, automation, laser, LED, lithium battery and precision instruments are supplied from this site, and 50-60% of output is exported. Engineering support, programming and inspection sit in the same building as the machines, so a drawing question is answered the same day it is asked.
Delivery Reliability
| Order Type | Lead Time | Commitment |
|---|---|---|
| Quotation and DFM | Within 24 hours | Process notes and cycle estimate |
| Prototype 1-10 pcs | 3-7 days | Photos and FAI before dispatch |
| Batch 10-100 pcs | 7-14 days | Weekly progress report |
| Series 100+ pcs | 14-30 days | Staged shipments to your line plan |
- Capacity around 10,000 pieces per month for this housing family
- Each part number is allocated to two machining centres, so a single machine stop does not idle your order
- Program, fixture and inspection plan are frozen after first article, which shortens every repeat run
- Buffer WIP held on running series orders to absorb your forecast changes
- Express (DHL / FedEx / UPS), air and sea freight, EXW / FOB / CIF terms
- Rush slots kept open for line-down situations, quoted with a date we can actually meet
Key Features
- Turn-mill single clamping for bore, flange and lug geometry
- Helical slot pattern that follows the load path
- 0.006 mm bore-to-flange concentricity with CMM evidence
- H7 / G7 bearing seats gauged on every bore
- Thin-wall lightening down to 1.2 mm without losing hoop stiffness
- In-process probing before the part leaves the spindle
- NDA-protected handling from quotation through shipment
- Prototype and series production on the same frozen program
Where It Is Used
- Industrial robot shoulder and elbow joint housings
- Collaborative robot wrist and forearm enclosures
- Harmonic drive and RV reducer housings
- Rotary index tables and machine tool articulation joints
- Semiconductor handling robot joint stages
- Medical and laboratory robot articulation structures
- Pick-and-place gantry joint enclosures
- AGV steering and drive unit housings
FAQ
Q: Can we start with one prototype before committing to a batch?
A: Yes. One piece is a normal order, with no tooling or programming charge, and the same program is reused when you scale up.
Q: Will you sign our NDA before we release drawings?
A: We sign a mutual NDA first, and the same applies to RFQ models, scans and physical samples. Use your form or ours.
Q: How do you keep a thin-wall housing from distorting after machining?
A: Stress-relieved blank, roughing separated from finishing by a relaxation dwell, reduced step-over on slot milling, and light finishing passes. Distortion is controlled in the route, not corrected afterwards.
Q: Which bearing fits can you machine?
A: H7 and G7 seats for harmonic drives, RV reducers, planetary gearboxes, crossed roller and standard ball bearings, with seal grooves and retaining features on the same setup.
Q: What information do you need for a quote?
A: 2D drawing with tolerances, 3D model, quantity per batch, material, surface treatment and target date. Reply within 24 hours including process observations.
Q: How is delivery kept stable on repeat orders?
A: Frozen program and fixture, capacity reserved per part number, two-machine allocation, buffer WIP, and a weekly progress report on every open order.
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