PRECISION HOUSING MACHINING
Custom Gearbox Housing
Precision machining of cast, forged and billet gearbox housings, including bearing bores, sealing faces, fluid passages, finishing and documented inspection.
HOUSING TYPES
Gearbox Housings We Machine
We select the manufacturing route according to housing geometry, material, production volume and inspection requirements.
Automotive and EV Housings
Bearing bores, oil passages, cooling channels, motor interfaces, sealing faces and mounting features.
Industrial Gearbox Housings
Parallel-shaft, planetary, worm and right-angle housings designed for rigidity, vibration control and service access.
Robot Joint Housings
Controlled relationships between bearing seats, mounting faces and motor interfaces for compact assemblies.
Legacy and Custom Replacements
Reverse-engineered housings based on drawings or samples, with worn and previously repaired features corrected before manufacture.
MATERIALS & BLANKS
Materials Selected for Load, Weight and Volume
Billet machining supports prototypes and low volumes. Sand, gravity and low-pressure castings suit medium volumes, while die castings support complex thin-wall production parts.
Aluminum Alloys
6061 and 6082 suit billet-machined housings. A356-T6 and AlSi7Mg combine strength with castability, while ADC12 supports complex die-cast production parts.
Cast Iron and Steel
Gray iron provides rigidity and vibration damping; ductile iron supports higher loads; fabricated steel suits large custom gearboxes.
Magnesium Alloys
AZ91D and similar alloys reduce housing weight. Machining requires controlled workholding, chip management and corrosion protection.
Key Machining Capabilities
Final tolerances are confirmed against bore size, material, wall thickness, datum structure and inspection method.
| Critical Feature | Typical Capability | Inspection Method |
|---|---|---|
| Bearing bore size | IT6–IT7; selected dimensions to ±0.005 mm | Air gauge, bore gauge or CMM |
| Bore roundness | 0.005–0.010 mm | Roundness tester or dedicated gauge |
| Bore surface finish | Ra 0.4–0.8 μm | Surface roughness tester |
| Bore-system geometry | 0.01–0.03 mm | CMM, master mandrel or functional gauge |
| Critical hole position | ⌀0.02–0.05 mm | CMM |
| Joint-face flatness | 0.02–0.05 mm over 300 mm | CMM or flatness measurement |
| Joint-face finish | Ra 0.8–1.6 μm | Surface roughness tester |
| Ground dimensions | Tolerance to ±0.003 mm, geometry dependent | Height gauge, precision gauge or CMM |
IT tolerance values vary with nominal diameter. Position tolerance uses the specified tolerance zone. Approved drawings and the inspection plan govern final acceptance.
CONTROLLED MACHINING
Typical Machining Process
A consistent datum structure carries through roughing, finishing and final inspection to control bore alignment, sealing faces and mounting interfaces.
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01Drawing and Blank Review
Confirm material, stock allowance, datums, critical tolerances and blank acceptance requirements.
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02Datum and Fixture Setup
Establish a common coordinate system from joint faces and locating features with low-stress clamping.
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03Roughing and Stabilization
Remove material symmetrically, retain finishing stock and stabilize thin-wall housings before final machining.
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04Bore and Sealing-Face Finishing
Finish bearing seats by precision boring, reaming or honing, then machine joint faces and seal grooves.
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05Deburring, Cleaning and Finishing
Remove burrs from intersecting passages, clean internal channels and apply the specified surface finish.
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06Final Inspection and Packing
Verify dimensions, GD&T and sealing performance before clean, protected packaging.
Machine related bearing seats and mounting interfaces in one setup or within a common coordinate system.
Finish joint and locating features first, torque the matched halves together, then bore the bearing seats as an assembly. Each pair remains uniquely identified.
SURFACE FINISHES
Finishes Matched to Material and Function
Drawings should identify masking or dimensional allowance for bearing seats, dowel holes, sealing faces, threads and grounding points.
Aluminum Housings
Standard or hard anodizing suits wrought alloys. Chemical conversion coating preserves electrical continuity, while e-coating, paint and powder coating protect cast housings.
High-silicon die-cast aluminum develops darker, less uniform anodized finishes, so coated finishes are preferred for controlled appearance.Iron and Steel Housings
Phosphate pretreatment with paint, powder coating or e-coating improves coating adhesion and corrosion protection.
Precision interfaces remain uncoated and receive rust-preventive oil plus protective packaging.Functional Post-Processing
Approved cast-aluminum microporosity can be vacuum impregnated. Deburring, ultrasonic cleaning and technical cleanliness testing are available before assembly.
Impregnation seals connected microporosity; structural cracks and major shrinkage remain rejection conditions.INSPECTION & QUALITY
Inspection Focused on Bores, Sealing and Cleanliness
The inspection plan follows housing function and risk. Bearing seats, critical datums and mating faces can receive 100% inspection when specified.
Blank Inspection
Verify material, heat treatment and stock. Select radiography, penetrant, ultrasonic or magnetic-particle testing by alloy and defect risk.
Dimensions and GD&T
Use bore gauges, air gauges, roundness testers and CMMs to verify bore size, geometry and datum relationships.
Leak Testing
Test enclosed oil cavities and cooling passages to the specified pressure, hold time and allowable leak rate.
Technical Cleanliness
Inspect residual particles in oil passages and bearing cavities to protect gears, bearings and valves.
Out-of-Round Bearing Seats
Reduce clamping stress, machine in stages and recheck roundness after finish boring.
Misaligned Bore Axes
Use a common datum system, machine related bores in one setup and verify them by CMM.
Joint-Face Leakage
Control flatness, roughness and seal-groove geometry, then test to the project specification.
Burrs in Cross-Holes
Use borescope inspection, targeted deburring and filtered flushing to clear internal passages.
WELDO MACHINING
One Supplier from Engineering Review to Shipment
Weldo operates Haas and Hurco multi-axis CNC equipment, supported by precision grinding, EDM, wire EDM, cleaning, assembly and more than 50 finishing options.
Project Workflow
- 1 Submit drawings, material, quantity and operating conditions
- 2 Review DFM, datums and the inspection plan
- 3 Produce the first article and required inspection records
- 4 Approve and lock the program, fixtures and quality plan
- 5 Run production, finishing, final inspection and packing
Lead times for large housings, casting-tool development and production orders are confirmed according to blank development, testing scope and quantity.
RFQ REQUIREMENTS
What to Provide for a Gearbox Housing Quote
Six inputs allow accurate process review, pricing and lead-time confirmation.
2D Drawings and 3D Models
Include complete geometry, datums, GD&T and revision status.
Material and Blank Type
Specify alloy, condition and cast, forged or billet-machined construction.
Quantity and Production Plan
State prototype quantity, batch size and estimated annual demand.
Critical Fits and Tolerances
Identify bearing seats, dowel holes, sealing faces and assembly interfaces.
Finishing and Inspection
Define surface finish, cleanliness, leak testing and required reports.
Service Conditions and Deadline
Provide loads, temperature, media, assembly conditions and target delivery date.
More Custom Machined Housings
The same CNC machining, precision boring and inspection capabilities support a wide range of custom housings from prototypes to production.
Motor Housings
Precision-turned bearing seats, controlled bore alignment, cooling features and matched end covers for motors and drive systems.
Instrument Enclosures
Machined panels, display openings and controlled assembly gaps with bead blasting, anodizing, screen printing or laser marking.
Sensor Housings
Sealing grooves, connector ports and compact internal features for aluminum or stainless steel sensor assemblies.
Battery and Power Housings
Large covers, sealing grooves, mounting interfaces and thermal features with optional leak testing for protected assemblies.
Telecom Equipment Housings
Integrated heat-dissipation features, sealing surfaces and conductive finishes for communication and electronic equipment.
Heat Sink Housings
Aluminum housings with thin fins, flat mounting faces and controlled interfaces for electronic and power-management assemblies.
Pump and Valve Housings
Internal flow passages, sealing faces, threaded ports and precision bores with optional air or hydrostatic leak testing.
Controller Housings
Five-axis machined contours, button openings and assembly features for industrial controllers and high-end electronic products.
More Custom Metal and Plastic Housings
Weldo machines custom metal and engineering plastic housings for automation, electronics, instruments, power systems and industrial equipment.
START YOUR PROJECT
Send Your Gearbox Housing Drawings for Review
Weldo will assess the manufacturing route, inspection plan, cost and delivery schedule.
FAQ
Custom Gearbox Housing FAQs
Answers covering reverse engineering, bore repair, joining methods, blanks, testing, lead time and data security.
Can you reproduce a gearbox housing from an existing part?
Yes. Weldo can model the sample and mating components, recover functional dimensions for bearings, seals, dowels and mounting interfaces, and correct measured wear or distortion before manufacture.
Can a worn bearing bore be repaired?
Yes, after inspection. Typical routes include boring and sleeving or metal deposition followed by finish machining. Cracks, severe porosity and structural damage require NDT and engineering assessment first.
Can Weldo supply the casting and finish machining?
Yes. We can source and inspect a casting before machining, or manufacture the housing directly from plate, bar or billet. Geometry, quantity and development schedule determine the best route.
How are gearbox housing components commonly joined?
Most housings use bolted flange joints with dowel pins for repeatable alignment and gaskets or liquid sealants for leak control. Press-fit pins and bushings support local interfaces, while fabricated steel housings may use welded joints followed by stress relief and finish machining.
Does every gearbox housing require leak testing?
Closed oil cavities, cooling channels and pressure passages require pneumatic or hydrostatic testing when specified. Open housings are normally assessed through joint-face, seal-groove, casting and assembly inspection.
What is the lead time for prototypes and production?
Typical prototypes and low-volume orders with available material dispatch in 3–15 days. Casting tooling, large fixtures, special testing and production volumes receive a project-specific schedule.
How does Weldo protect customer design data?
Weldo supports NDAs and project-based access control. Drawings, models, programs and inspection records are limited to authorized engineering, production and quality personnel.