Robot Joint Connecting Arm Dual Bearing Housing 6082-T6 Aluminum Press Fit Select 0.008mm
Robot Joint Connecting Arm Dual Bearing Housing 6082-T6 Aluminum Press Fit Select 0.008mm
Place of Origin:China
Brand Name:China-CXD
Certification:ISO 9001:2015
Model Number:Custom
Minimum Order Quantity:1 piece
Price:According to drawings
Standard Packaging:Bearing seats protected with VCI film and bore plugs, seal grooves masked, foam-cradled export carton, pallet with edge protection for sea freight.
Delivery Time:Prototype 3-7 days. Batch 10-100 pcs: 7-14 days. Series 100+ pcs: 14-30 days depending on bearing specification and feature count. Staged shipments accepted.
Payment Terms:T/T,L/C,D/A,D/P
Supply Ability:10000 Pcs/Month
Product Details
Highlight:
Dual Bearing Housing Arm
,Select Fit Press Trial
,One Setup Twin Seat Boring
Material:
6082-T6 Aluminum
Process:
5-Axis Machining, One-Setup Boring Both Seats
Seat Coaxiality:
0.008 Mm
Bore Size Band:
0.005 Mm, Graded A/B
Bearing Centre Distance:
+/-0.01 Mm
Seat Face Squareness:
0.01 Mm
Seat Surface Finish:
Ra 0.4 Um
Seal Groove Tolerance:
0.02 Mm
Bearing Types:
Ball, Angular Contact, Crossed Roller, Tapered
Arm Length:
100-600 Mm Customized
Boss Diameter:
40-250 Mm Customized
Surface Treatment:
Clear Or Black Anodize, Hard Anodize
Inspection:
CMM + Press-Fit Record + Borescope + FAI
Design Formats:
STEP, IGES, X_T, DXF, PDF
Confidentiality:
Mutual NDA Before File Release
Shipping Way:
Express, Air, Sea
Product Description
Detailed Specifications & Features
Bearing seats bored in one setup · press-fit trial before dispatch
Dual bearing connecting arm, 6082-T6, seats coaxial to 0.008 mm and graded for fit
Seal grooves and grease passages cut in the same operation · drawings released under mutual NDA
The Bearing Seats Are the Product
On a dual bearing arm, the arm itself is rarely the problem. The seats are. Each end carries a bearing boss, and if the two seats are not coaxial, the bearing races fight each other, preload climbs, and the joint runs warm and noisy long before the arm is worn out. This connecting arm is therefore built around the seats: both bosses are bored in one clamping, the seal grooves and grease passages are cut in the same operation, and the bearings are trial pressed before the arm is packed.
Between the bosses sits a machined bridge with relief pockets, sized for stiffness rather than appearance. Flange faces, threaded hole circles and dowel features are all referenced to the same datum, so the arm bolts to the reducer on one end and the link on the other without shimming.
0.008 mmSeat-to-seat coaxiality
0.005 mmBore size band, H7 centre
±0.01 mmBearing centre distance
100%Bearing press-fit trialled
How It Is Produced
Ten steps, and the order is what protects the seats. Roughing and finishing are never done in one pass on a part with two bearing bosses.
Drawing and bearing review. Bearing type, seat fit, preload, seal arrangement and grease path are reviewed together. A written DFM note, including any fit advice, goes back within 24 hours.
Blank from 6082-T6 plate. The blank is cut oversize from a single plate so both bosses come from the same heat lot; mill certificate is filed against your project code.
Stress relief and facing. Blank is stress-relieved and faced flat, so the bridge does not bow when the relief pockets open.
Roughing both bosses and bridge. Boss stock, bridge and pocket material removed with 0.5-0.8 mm allowance, clamping kept light to avoid squeezing the bosses oval.
Relaxation dwell. The arm rests before finishing. On a two-boss part, this is the difference between seats that stay round and seats that spring after release.
5-axis finishing of bridge and pockets. Bridge, relief pockets, ribs and boss outer profiles are finished with the part still in the same fixture as the boring stage.
One-setup boring of both seats. Both bearing seats, seal grooves and retaining shoulders are bored in a single clamping, so coaxiality is set by the machine axis.
Grease passages and cross-drilling. Lubrication holes are drilled to the seat, deburred from inside and checked with a borescope so no chip is left in the channel.
Press-fit trial and fit grading. Sample bearings are pressed in and out with force recorded, seats are graded A or B by measured size, and the grade is marked on each arm.
CMM, marking and treatment. Coaxiality, centre distance, squareness and groove position are measured on the CMM; laser serials applied; anodize with seats and seal grooves masked.
Precision Capability
| Characteristic | Held To | Verification |
|---|---|---|
| Seat-to-seat coaxiality | 0.008 mm | CMM, both seats one setup |
| Bearing seat fit | H7 / G7 per drawing | Bore gauge, every seat |
| Bore size band | 0.005 mm within batch | Bore gauge, graded A/B |
| Bearing centre distance | ±0.01 mm | CMM, bore axis to axis |
| Seat face squareness | 0.01 mm | CMM, datum face |
| Seal groove width and position | 0.02 mm | Profile projector, sampled |
| Grease passage clearance | Verified open | Borescope, every passage |
| Seat surface finish | Ra 0.4 µm | Roughness tester, per batch |
Grading is why a bearing feels right in the assembly. Seats are measured individually and marked A or B by size band. When you press bearings on your line, the arm and bearing pairing is predictable instead of a coin toss, and a replacement arm can be ordered in the same grade as the originals.
Non-Standard Connecting Arms
Arms are built to your drawing, including the bearing specification. Nothing is restricted to a catalogue length.
- Arm length 100-600 mm, boss diameter 40-250 mm, seat bore 10-150 mm
- Materials: 6082-T6, 6061-T6, 7075-T6, 2024-T351, 304/316L stainless, 4140 steel on request
- Bearing types: deep groove ball, angular contact, crossed roller, tapered roller, plain bushings
- Features: seal grooves, retaining shoulders, grease nipples and internal passages, encoder pockets, hard stops, cable channels
- End combinations: boss plus clevis, boss plus flange, offset bosses, unequal boss sizes
- Optional extras: bearing supply and pre-assembly, matched preload shim sets, stiffness spot checks
- Input formats: STEP, IGES, X_T, STL, DXF, 2D drawing with GD&T, or a sample for scanning and rebuild
Confidentiality
Arm geometry, bearing choice and preload strategy are competitive information.
- 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, CMM sheets and shipping labels carry an internal project code, not your product name
- No photo, sample or reference of your arm is released without written approval
- Fixtures, programmes and fit-grading records built for your job remain your property
- Files and backups deleted at project close on request
The Factory
Dongguan Changxinda Precision Technology Co., Ltd has made custom machined parts since 2008. Equipment includes 4-axis and 5-axis machining centres, turn-mill combination lathes, CNC lathes and milling machines, backed by an ISO 9001:2015 quality system and an in-house CMM room. Over 200 customers in medical equipment, robotics, automotive, aerospace, automation, laser, LED, lithium battery and precision instruments are supplied from this plant, and 50-60% of output is exported. Bearing-seat boring, seal grooves and press-fit trials are standard practice here, not an added service.
Delivery You Can Plan
| Stage | Lead Time | Included |
|---|---|---|
| Quote and DFM | Within 24 hours | Bearing fit advice, grading plan, cycle estimate |
| Prototype 1-10 pcs | 3-7 days | Press-fit record, CMM report, FAI |
| Batch 10-100 pcs | 7-14 days | Grade marking, weekly progress report |
| Series 100+ pcs | 14-30 days | Staged shipments against your build plan |
- Capacity around 10,000 pieces per month for this arm family
- Repeat orders keep the same programme and grading band, so a spare arm matches the originals
- Each part number allocated across two machining centres to protect your date
- Buffer WIP on running series orders for forecast changes
- Express, air and sea freight; EXW, FOB or CIF terms; seats protected with VCI film and bore plugs
- Rush capacity for line-down situations, quoted with a date that can be met
Key Features
- Both bearing seats bored in one clamping for 0.008 mm coaxiality
- 6082-T6 aluminum plate, single heat lot per arm
- Bore size band held to 0.005 mm and graded A/B for predictable press fit
- Seal grooves and retaining shoulders cut with the seats
- Grease passages drilled, deburred inside and borescope verified
- Bridge relief pockets for stiffness at minimum mass
- Trial bearing press before dispatch, with force recorded
- NDA-protected handling and project-code documentation
Typical Applications
- Industrial robot upper arm to forearm connections
- Collaborative robot joint-to-joint links
- Humanoid robot limb structure
- Gantry and pick-and-place arm extensions
- Semiconductor handling robot arm links
- Medical and laboratory robot linkages
- Automation articulated arm assemblies
- Test rigs and endurance benches
FAQ
Q: Do you supply the bearings as well?
A: We can, or we can work with the bearings you already specify. Either way the seats are measured and graded against the bearing fit you require.
Q: What does press-fit trial actually mean?
A: A sample bearing is pressed into and out of the seat with force recorded, then the seat is graded A or B by measured size. You receive the record with the batch.
Q: Will you sign an NDA before we share the arm drawing?
A: A mutual NDA is signed first, covering drawings, models, scans and samples, including bearing and preload details.
Q: Can you machine seal grooves and grease passages in the same operation?
A: Yes. Seal grooves and retaining shoulders are cut with the seats, and grease passages are drilled afterwards, deburred from the inside and checked with a borescope.
Q: What is the minimum order?
A: One piece, with no tooling charge and no programming fee, so a single arm for a prototype build is a normal order.
Q: How do you keep repeat batches consistent?
A: Frozen programme, same grading band, same inspection plan, and capacity reserved per part number. A repeat arm will press the same way as the first batch.
Q: What do you need to quote?
A: 2D drawing with tolerances, 3D model, quantity, material, bearing specification and target date. Quote and DFM comments return within 24 hours.
Related Parts From The Same Plant
- Robot Arm Linkage Set 6061-T6 Aluminum Mirrored Pair Weight Matched 0.005mm Bore Coaxial
- Robot Joint Housing 6061 Aluminum Helical Weight Slots Turn-Mill Machined 0.006mm Concentricity
- Robot Shoulder Links Aluminum Yoke Fork Connectors CNC Precision Machined 0.01mm
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