Robot Gearbox Housing 7075-T6 Aluminum Matched Cover Pair Line Bored H7 Bearing Seats 0.005mm
Matched Housing Cover Pair
,Line Bored H7 Gear Seats
,Gear Centre Distance Control
Why This Housing Is Machined as a Pair
A gearbox housing only performs if the cover and the body agree. Bored separately, the two halves each pass inspection and still deliver a misaligned gear train, because half a thousandth in each half adds up at the mesh. This housing is therefore machined as a matched set: body and cover are cut from the same 7075-T6 stock, dowelled, bolted together, and the bearing seats and shaft openings are bored in the assembled state. When you separate the halves for assembly, the alignment is already built in.
The envelope carries an internal reducer cavity, H7 bearing seats on two opposing walls, a sealed cover joint, an output shaft opening, a motor interface flange and a cable exit. All of it is generated from your model, not from a catalogue pattern.
How It Is Produced
The sequence below is written for a matched housing and cover set. Steps are removed for prototypes and kept for series work, but the order never changes: stress first, alignment last.
Precision We Hold
| Characteristic | Capability | Verification Method |
|---|---|---|
| Gear centre distance | 0.005 mm (matched pair) | CMM, assembled state |
| Bearing seat tolerance | H7 / G7 per drawing | Bore gauge on every seat |
| Bore parallelism | 0.008 mm per 100 mm | CMM axis evaluation |
| Bore-to-joint face perpendicularity | 0.01 mm | CMM, datum face |
| Bolt hole position | 0.02 mm | CMM, best-fit pattern |
| Joint face flatness | 0.008 mm | Granite plate and indicator |
| Seal groove width and depth | 0.02 mm | Profile projector, sampled |
| Seat surface roughness | Ra 0.4 µm | Roughness tester, per batch |
Where a drawing asks for tighter values than the route above can repeat, we flag it during quotation and propose an alternative process rather than accept a tolerance we cannot hold batch after batch.
Non-Standard and Custom Work
Housings are built to drawings here, and the range below reflects what the shop actually runs, not a catalogue.
- Housing size 50-300 mm envelope, bore 8-150 mm, cavity depth up to 120 mm
- Materials: 7075-T6, 6061-T6, 6082-T6, 2024-T351, 304/316L stainless, 4140, ductile iron on request
- Reducer types: harmonic drive, RV reducer, planetary stage, worm and spur gear trains
- Integrated features: motor and encoder flanges, oil sight ports, breather holes, cable channels, seal grooves, dowel pin holes, helicoils, laser marking
- Matched sets, cover pairs, bearing press-fit trials and assembly-level stack-up checks
- Input formats: STEP, IGES, X_T, STL, DXF, 2D drawing with GD&T, or a sample for 3D scanning and rebuild
Confidentiality
- Mutual NDA signed before drawings, models, scans or samples are exchanged
- Files held on a restricted local server, access limited to the assigned engineer and programmer
- Quotations, inspection sheets and shipping documents carry an internal project code, not your product name
- No photo, sample or reference of your part is released without written approval
- Fixtures, tooling and NC programs built for your job remain your property
- Files and programs deleted at project close on your request
About the Factory
Dongguan Changxinda Precision Technology Co., Ltd has produced custom machined components since 2008. Equipment includes 4-axis and 5-axis machining centres, turn-mill combination lathes, CNC lathes and milling machines, supported by an ISO 9001:2015 quality system and an in-house CMM room. The plant serves more than 200 customers in medical equipment, robotics, automotive, aerospace, automation, laser, LED, lithium battery and precision instruments, with 50-60% of output exported. Programming, engineering and inspection are under the same roof as the spindles, so a drawing question is answered while the job is still on the machine.
Delivery That Holds Its Date
| Order Stage | Lead Time | What Ships With It |
|---|---|---|
| Quote and DFM | Within 24 hours | Process notes, fixture concept, cycle estimate |
| Prototype, 1-10 pcs | 3-7 days | Photos and FAI report before dispatch |
| Batch, 10-100 pcs | 7-14 days | Weekly progress report |
| Series, 100+ pcs | 14-30 days | Staged shipments matched to your build plan |
- Monthly capacity near 10,000 pieces for this housing family
- Each part number is allocated across two machining centres, so a single breakdown does not stop your order
- Program, fixture and inspection plan frozen after first article; repeat batches skip the ramp-up
- Buffer WIP held on running series orders for forecast changes
- DHL, FedEx, UPS express, air and sea freight; EXW, FOB or CIF terms
- Rush capacity for line-down situations, quoted with a date we can meet rather than a date that sounds good
Key Features
- Housing and cover machined as a matched pair from one plate
- Bearing seats line bored after bolting, so alignment is built in
- 0.005 mm gear centre distance on the assembled set
- H7 / G7 seats gauged one by one, not sampled
- 7075-T6 aluminum for stiffness at the reducer cavity walls
- Assembled-state CMM report shipped with the batch
- NDA-protected handling and project-code documentation
- Single prototype to serial production on the same frozen program
Typical Applications
- Industrial robot joint reducer housings
- Collaborative robot harmonic drive enclosures
- RV reducer and planetary gearbox bodies
- Machine tool rotary table drive housings
- Semiconductor handling robot joint modules
- Medical and laboratory robot drive enclosures
- Pick-and-place gantry gear units
- AGV wheel drive and steering gearboxes
FAQ
Q: Can the housing and cover be ordered as a set?
A: Yes, and we recommend it. The pair is machined and bored together, marked with a matching serial, and shipped as one set so you never mix halves from different batches.
Q: Will you sign an NDA before drawings are sent?
A: A mutual NDA is signed first, covering drawings, 3D models, scans and physical samples. Use your document or ours.
Q: How is gear centre distance controlled?
A: Both bores are cut in one line-boring pass with the cover bolted and dowelled in place, then verified on the CMM in the assembled state. Verification happens on the joint, not on each half separately.
Q: What is the minimum order for a non-standard housing?
A: One piece. No tooling charge and no programming fee, so a single prototype for fit and function testing is a normal order.
Q: Can you match our existing surface treatment?
A: Send the specification or a sample. We work with clear anodize, black anodize, hard anodize 25-40 µm, chromate conversion and sandblast, with masking on bores, joint faces and seal grooves.
Q: How do you keep repeat orders on schedule?
A: Frozen program and fixture, capacity reserved per part number, two-machine allocation, buffer WIP on series orders, and a weekly progress report until the shipment leaves.
Q: What do you need for a quotation?
A: 2D drawing with tolerances, 3D model, quantity per batch, material, treatment and target date. Quote and DFM comments follow within 24 hours.
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