Precision CNC Machining for Robotics & Automation
Reducer & Gearbox Housings Built for Precise Motion
RobotPartsCNC manufactures precision CNC-machined housings for planetary gearboxes, strain wave gears, cycloidal drives, and robotic joints. We control the relationships between multiple bearing bores, sealing surfaces, internal cavities, and mounting features so your transmission performs consistently.
±0.005 mm
Precision tolerance
5-axis
Complex alignment work
Ra 0.4
Surface finish capability
3–7 days
Prototype lead time
Designed around
Bearing alignment
Validated with
CMM inspection data
Why housing accuracy matters
The housing is the reference structure for the entire reducer
In robotics and motion control, the housing determines how accurately the motor, gear train, and output shaft remain aligned under load. A small error between bearing seats can create radial play, vibration, uneven gear mesh, seal wear, and premature mechanical failure.
Discuss your critical featuresMultiple bearing bores
Controlled diameter, true position, and coaxiality support reliable press or slip fits across the housing.
Sealing surfaces
Precisely machined sealing faces help retain grease and protect the gear train from contamination.
Thin-wall stability
Specialized work-holding helps prevent chatter, distortion, and wall-thickness variation in lightweight robotic housings.
Complex internal cavities
High-speed milling produces gear-clearance features and grease reservoirs with smooth, fatigue-resistant surfaces.
Manufacturing capabilities
Fewer setups. More consistent geometry.
We use 3-, 4-, and 5-axis CNC machining centers to produce housings from solid metal blocks or near-net-shape castings. Integrated turning and milling operations reduce re-fixturing and improve repeatability between related bores and datum features.
Material selection
Match rigidity, weight, and thermal stability to the application
Our team regularly machines materials selected for robotic joints, medical automation, collaborative robots, and high-torque industrial gearboxes.
Aluminum 7075-T6
High strength and low weight for humanoid and collaborative robot joints, with excellent machinability and stability.
Aluminum 6061-T6
A cost-effective choice for general-purpose robotic housings where good surface finishing and anodizing are priorities.
Stainless steel 303 / 304 / 17-4PH
For medical or cleanroom robotics requiring corrosion resistance and higher stiffness under heavy-duty loads.
Carbon and alloy steels 4140 / 4340
For high-torque industrial gearboxes exposed to significant mechanical shock and stress.
Inspection and quality control
Inspection data that supports your assembly line
A gearbox housing is only as reliable as the measurement data behind it. Our quality team verifies the features that establish gear mesh, bearing alignment, sealing performance, and mounting accuracy before parts reach your production team.
Documentation available
01
True position
Mounting holes and bores are checked against the CAD model to confirm positional accuracy.
02
Geometric tolerances
Flatness, parallelism, and perpendicularity are verified for reliable gearbox assembly.
03
Bore metrology
Air gauges and bore micrometers verify bearing-seat diameters and fit requirements.
04
Critical surfaces
Sealing faces, datum surfaces, and internal interfaces are reviewed for functional consistency.
Prototype to production
A process that scales with your robotics program
Start with a five-piece prototype order and transition to a 500-piece production run using the same manufacturing strategy. We develop fixtures and CNC programs that reduce the need for re-engineering when your project moves from validation to production.
Prototyping and design verification
We optimize for speed and quickly adjust CAD/CAM strategies when housing designs change after initial testing.
Fixture and process development
Datums, work-holding, and machining sequences are refined to protect thin walls and preserve bore-to-bore relationships.
Low-volume and production runs
Optimized fixturing reduces cycle time and unit cost while keeping the 100th housing consistent with the first.
Project preparation
What to include with your RFQ
Our engineering team reviews your drawings for DFM opportunities before production, including internal radii, bore access, work-holding, and the most reliable inspection approach.
01 / Files
Prepare your CAD package
Send 3D CAD models, preferably STEP or IGES, together with 2D drawings and GD&T requirements.
02 / Requirements
Define the critical features
Specify material, surface finish, bearing fits, coaxiality requirements, sealing surfaces, and expected quantities.
03 / Review
Receive an engineering response
We assess manufacturability and recommend practical improvements before machining begins.
Common questions
Reducer housing machining FAQ
How do you maintain coaxiality between multiple bearing bores? +
We plan datums and machining sequences around the bore relationships, use 5-axis machining where appropriate, and minimize re-fixturing to reduce cumulative alignment error.
Can you machine thin-walled robotic housings? +
Yes. Specialized work-holding and controlled machining strategies help limit chatter, distortion, and wall-thickness variation in lightweight designs.
What inspection documents can accompany the parts? +
Full inspection reports, CMM data, material certificates, bore measurement results, and production traceability documentation are available upon request.
Request a quote
Send your reducer or gearbox housing requirements
RobotPartsCNC is based in Shenzhen, China, with direct access to a comprehensive supply chain for raw materials, heat treatment, anodizing, nickel plating, and other finishing services.
Email: info@robotpartscnc.com
Address:
Service: Precision CNC machining for robotics and automation
Start your engineering review
Share your drawings, CAD models, material requirements, and critical tolerances with our team.