Robot Joint Connecting Arm Dual Bearing Housing 6082-T6 Aluminum Press Fit

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.

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.

Precision Capability

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

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

• 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