Custom Bearing Housings Parts CNC Machining for Robotics Industry

Aluminum alloys, cast iron, steel, and ductile iron are among the most popular bearing housings. Each holds unique advantages. Concerning aluminum alloys, 6061-T6 and 7075-T6 offer lightweight, structurally strong alternatives, which decrease the overall assembly weight by 50 to 65 percent as compared to cast iron. They possess higher thermal conductivities, thus providing quicker heat dissipation (4 to 5 times quicker than steel) and allowing cooler bearing operations and longer lubrication lives. They are quite easily machined to complex geometries, possess natural corrosion resistance, and provide adequate rigidity for collaborative robots, which makes robotic systems modernized lightweight for improved dynamic responsiveness and energy efficiency in higher cost robotic systems. Cast iron Class 40 is unsurpassed dampens vibrations and bearing induced noise and vibrations by 40 to 60 percent compared to welded steel housings. It exhibits excellent thermal expansion (dimensional) stability and thermal resistance to wear. It is praised for old reliable heavy duty industrial work, primarily for precision machine tools, gearboxes, and cutting. Cast iron also boasts significant dampening, rigidity, and economic production through complex casting in screws and traditional machining for precision industrial work.
Steel plates composed of A36 structural steel and 1018 mild steel serve exceptional strength and stiffness supportive of heavy-load applications where bearings are placed under shock and moment force coupled with welding ease where mounting brackets and reinforced housing brackets are fabricated, gussets are diverse in costs and thicknesses, machining and stress relief gears will offer adequate performance and will provide reliability in payload industrial robotics over 100 kilograms handled elastically. Ductile providing a damping characteristic of cast iron with 50 percent increased tensile strength and outstanding impact resistance over gray cast iron with machining ease, adequate ductility assist in providing resistance closure of brittle fracture under dynamic loading, casting of advanced designs with core holes and cored lubrication passage, and robust bearing support structure made in medium to high production of ribbed interworking systems offer good cost.

High-precision bearing housing manufacturing employs modern high-precision CNC technologies like multi-axis CNC milling for the housings’ external profiles, which also incorporate mounting flanges, as well as internal contours like sensor mounts, and cable clips; CNC boring for the bearing bores to tolerances H7 and H8 with bore diameter and cylindricity control with ±0.0005 inches and 0.0003 inches respectively, and precision spaced face alignment to ± 0.0003 inches over 8 coaxial bore stacks for long and split housings, face milling for the clinching mounting surfaces to a 0.001 inches total variation flatness, seal groove machining to a specified depth to ±0.002 inches for O-ring sealing and surface or groove finish for lip seals, mounting bolt through hole drilling and tapping as well as grease fitting and drain plug through hole tapping, counter boring and counter sunk to flush mount hardware, pocket milling for oil reserve creation and auger milling to reduce weight, edge of the bore and bearing housing chamfering and radiusing, and border of the bearing housings snap ring grooves grinding to the final precision after any required heat treatment, bore honing for final size and surface finish in the range of 32-63 Ra microinches, and bore and mounting pattern symmetry with face perpendicularity checked via CMM. Precision machining to finish functional surfaces is done per specified tolerances after casting or forging for aluminum or iron housings.

We consistently achieve tolerances of ±0.0005 inches on critical dimensions of bearing housings. This involves ensuring that the bearing bore diameters are controlled within H7 tolerances (±0.0005 to ±0.001 inches depending on bore size) to fit bearings to housings with appropriate clearance and interference adjustments. These involve accurate bore geolocations defined within ±0.001 inches to shaft alignment requirements for perpendicularity, controlling alignment of the shaft, and bore axis perpendicularity to the mounting surface within ±0.001 inches per inch of the bore length to avoid side loading on the bearings. The flatness of the mounting surface within ±0.001 inches of the full area also counters side loading for lateral load-bearings. The required shaft alignment is achieved with concentricity of ±0.0005 inches on multiple bores in single housings. We place our clamp patterns for mounting holes within ±0.003 inch for conformity to common robots and mechanized patterns for interchangeability. Sealing with controlled tolerances for constructed grooves within ±0.002 in, shoulders for axial bearing assemblies, and shoulder dimensions, ensures active removal with designed clearance or interference and axial location of bearings with shafts and ends. These features are designed to effective sealing of contamination to IP54 or IP65 standards, thermal stability to bear and maintain designed shaft clearance at bearing housing to±80 to -20, stabled ranges, then rigid to stiff housing to limit housing deflection to less than 0.001 to maintain alignment of bearing and limit misalignment from shifting/load.

Yes. We offer flexible manufacturing capabilities including:
Rapid prototyping for design validation
Low-volume production for specialized applications
High-volume production with consistent quality control
Full structural and dimensional verification at every stage

Yes, all parts are produced under ISO 9001 certified quality management systems. We adhere to standards pertaining to industrial robotics as well as customized dimensional and material stipulations including surface finish, and structural integrity, covering tolerances, and surface finish of bearing housers, bearing manufacturer installation directives, and complete traceability and documentation for raw materials, quality audits, and continuous improvement for bearing support components, all of which prevent faulty housing designs and machining that can lead to premature failure of the bearing, malfunction of the robot, or downtime of the robot in industrial automation.

We provide comprehensive finishing solutions tailored to aerospace requirements:
Anodizing (Type II and Type III)
Passivation for corrosion resistance
Precision polishing for aerodynamic surfaces
Custom protective coatings and thermal barriers

Lead time is dependent on the degree of complexity and volume of the order. Including machining, surface treatment, and inspection, the typical lead time for standard bearing block housings of lower complexity is 8–14 business days. For complete manufacturing, including applicable casting lead time, the lead time for more complex split housings containing multiple finger bores and engineered integrated split housings is 3–5 weeks. For design verification and bearing fit testing, prototype housings machined from billet aluminum or steel can be done in 5 to 8 days. Volume orders are processed in machining cells with fixture design that reduce cycle time. Reduction in cycle time is attained by the detailed production schedule provided as part of the quotation, which Includes procurement of materials, machining operations, surface treatment, and quality verification.

Absolutely. Our engineers work with robotics designers in the creation of integrated bearing housing alternatives that maximize architectural efficiency while streamlining the assembly process. We design bearing seats to be machined into the arm and joint structures of the robot to diminish the separate components and achieve further weight reduction, create multifunctional housings that combine bearing support, gearbox mount, and motor attach interface, and apply finite element analysis to optimize housing geometry to meet housing rigidity and weight removal goals. We develop split housing designs that have bearing plane precision machined split lines allowing the bearing to be installed in space-restricted assemblies, develop integrated sealing techniques and labyrinth and contact seal arrangements around the bearing to meet required envelope constraints, and develop lubrication arrangements with grease lines and oil reservoirs for improved lubrication retention and extended maintenance schedules. We include cable and pneumatic lines in hollow-bore designs so they can be routed through the bearing for the purpose of actuation in applications that require a compact design in collaborative robot joints, lightweight structures for rapid acceleration in high-speed pick-and-place robots, and weight-sensitive mobile robots.

CNC machining is beneficial in offering performance advantages in a variety of ways. Correct bearing bore dimensions held within the H7 tolerance range specification allow the outer rings of the bearing to fit tightly enough to avoid bearing creep. ‘Fretting’ corrosion occurs at bearing creep surfaces and leads to premature failure. The outer ring bearing fit may also hav a clearance fit to allow for thermal expansion in temperature changing environments. The precise bore perpendicularity to the mounting surface at 0.001 inch tolerance results in a bearing aligned properly to the mounting surface. The mounting surface parallelism and flatness at 0.001 inch tolerance results in uniform bolt clamping which allows the installation load to be distributed evenly and reduces distortion of the housing which may affect bearing clearances. The controlled surface finish on the bearing bores of 32 to 63 Ra microinches provides the texture required for retention of a fit as well as smooth installation of the bearing in order to avoid galling. The proper shoulder dimensions which axially locate a bearing within ±0.001 inches ensures the designed preload is achieved in angular contact bearing arrangements while the accurate seal groove machining provides effective environmental protection.
To limit housing deflection under load to less than 0.001 inches, adequate wall thickness combined with structural reinforcement is essential to sustaining bearing alignment, maintaining internal clearance changes, and preventing rapid wear. The integration of heat dissipating features such as external fins and the optimization of mass distribution keep bearing temperatures to below 80 degrees Celsius, which preserves the viscosity of the lubricant and extends the life of the grease. The life of the grease is extended from 2,000 hours to 10,000 hours. Materials of good quality and their damping characteristics minimize the propagation of vibration from the bearings to the robot structures which helps in noise reduction of the entire system by 5 to 10 dB. Bearings incorporate precision machining with mounting interfaces for shafts, which facilitate accurate installations and alignment within 0.001 inches, critical for the quality of gear meshing and life of the couplings.
The ability to interchange assemblies simplifies field service and reduces spare parts inventory due to the dimensional consistency maintained across production. The production of precision-machined bearing housings creates the structural foundation necessary for robotic systems providing reliable bearing support for more than 20,000 hours of operation while maintaining proper shaft alignment, quality gear mesh, and coupling life, effective contamination protection to IP54 or IP65 standard for industrial environments, thermal management operating within the optimal range for lubrication, and vibration isolation to mitigate overall system noise and protect sensitive components. Maintenance intervals are lengthy, with bearings and seals scheduled for replacement after 10,000 to 20,000 hours of operation, depending on the intensity of the application. Predictable performance for productive automation is observed in the automotive assembly industry due to the continuous operation reliability, food processing industry with washdown IP sealed housings, packaging machinery with cycle rates over 200 operations per minute, logistics automation operating 24/7, and medical robotics where operation must be smooth, quiet, and compatible with sterilization.