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CNC Motor Shafts Technical Specifications
| Sleeve Types | Flanged Bushings, Straight Sleeves, Stepped Bushings, Seal Sleeves |
|---|---|
| Primary Equipment | Star CNC Swiss-type Lathes, CNC Lathes, Internal Cylindrical Grinders |
| Dimensional Tolerance | Inner Bore (ID): H7 (±0.005mm); Outer Diameter (OD): h6 (±0.004mm) |
| Geometric Tolerances | Concentricity (ID to OD): 0.005mm; Cylindricity: 0.003mm |
| Common Materials | C36000 Brass, Bronze, SUS304/316L, 42CrMo, Carbon Steel |
| Heat Treatment | Quenching & Tempering, Induction Hardening, Solution Annealing (Stainless) |
| Surface Roughness (Ra) | Ground/Honed Inner Bore: Ra 0.2 - Ra 0.4; Turned Surfaces: Ra 0.8 - Ra 1.6 |
| Machining Features | Internal Oil Grooves, External Snap Ring Grooves, Lubrication Cross-Holes |
| Surface Treatments & Cleaning | Hard Chrome Plating, Phosphating, Black Oxide, Ultrasonic Cleaning |
| Inspection Equipment | Japanese/German CMM, Air Gauges, Bore Scopes, Roundness Testers |
High-Precision CNC Motor Shafts for Optimal Alignment and Wear Reduction
At Xierge Precision Machinery Co., Ltd., we leverage over 30 years of operational experience since 1990 to manufacture premium CNC Motor Shafts for the global automotive, industrial machinery, and medical equipment sectors. Shaft sleeves are critical mechanical sealing and bearing components designed to reduce friction between rotating shafts, maintain precise alignment, and protect expensive machinery spindles from abrasive wear. These demanding applications require the components to possess extreme concentricity, strictly controlled wall thickness, and superior surface finishes on the inner diameter (ID). In high-speed rotary or heavy-load systems, even a microscopic deviation in cylindricity or a slight surface defect can lead to fluid leakage, excessive vibration, and premature catastrophic failure of the equipment.
To achieve flawless results, our state-of-the-art facility is equipped with Japanese imported Star CNC Swiss-type lathes, heavy-duty domestic CNC lathes, and high-precision internal cylindrical grinders. The guide bushing technology on our Swiss lathes provides continuous, rigid support, completely eliminating deflection when machining long, thin-walled sleeve geometries. This specialized equipment allows us to turn complex stepped profiles, bore precision internal chambers, and machine outer mounting grooves in highly rigid, single continuous setups, ensuring absolute coaxiality between the ID and the OD.
Following our core principle of "Integrity Oriented, Quality Foremost," we strictly adopt premium raw materials, such as C36000 brass, bronze, SUS304/316L stainless steel, and 42CrMo alloy steel, to ensure maximum wear resistance and structural integrity. To guarantee reliable product performance, we apply strict quality inspection protocols utilizing a complete set of testing instruments imported directly from Japan and Germany. We keep innovating to maintain sound business development and warmly welcome domestic and overseas clients to visit our factory and explore custom OEM/ODM cooperation opportunities.
Core Advantages of Xierge CNC Motor Shafts
- Extreme Concentricity Control: By boring the inner diameter and turning the outer profile in a single continuous setup on our Swiss lathes, we eliminate secondary clamping errors, maintaining strict coaxiality between the ID and OD.
- Zero-Deflection Thin-Wall Machining: Our Japanese Star CNC Swiss-type lathes utilize continuous guide bushing support, enabling the machining of thin-walled sleeves without ovalization or bending under cutting pressure.
- Superior Wear Resistance: We strictly select premium bronze, brass, and hardened alloy steels, providing excellent embeddability and wear resistance for high-speed rotary and sliding applications.
- Mirror-Like Bore Finishes: Equipped with high-precision internal cylindrical grinders and honing tools, we achieve micro-finishes (Ra 0.2) on the inner bore, significantly reducing shaft friction and preventing premature seal wear.
- Burr-Free Oil Groove Machining: To prevent internal debris from scoring the shaft, we utilize specialized live tooling and back-chamfering techniques to machine internal spiral or axial oil grooves without leaving internal burrs.
- Advanced Anti-Corrosion Coatings: We coordinate hard chrome plating, phosphating, or black oxide treatments to ensure long-term rust prevention and reduced friction in harsh hydraulic or chemical environments.
- 3-Decade OEM/ODM Innovation: Since 1990, we have continuously innovated, collaborating closely with clients to optimize DFM (Design for Manufacturing) for custom sleeve geometries, scaling seamlessly from prototyping to mass production.
Payment Methods & Global Logistics Solutions
Secure International Payment Terms:
To facilitate smooth B2B international trade, we offer flexible and secure payment options. For mass production orders of CNC Motor Shafts, we accept standard T/T (Telegraphic Transfer) with a 30% advance deposit and 70% balance before shipment. For large-scale automotive or industrial machinery supply contracts, we are fully capable of processing Irrevocable Letters of Credit (L/C) at sight. For initial prototyping, sample orders, or custom tooling fees, PayPal and Western Union are also available to expedite the process.
Global Logistics & Protective Packaging:
We provide comprehensive end-to-end shipping solutions under FOB, CIF, and DAP Incoterms. For urgent prototypes or small batches, we utilize expedited international couriers such as DHL, FedEx, and UPS. For bulk mass production, we offer highly competitive sea freight (LCL/FCL) and air cargo rates through our trusted global forwarder network. Recognizing that shaft sleeves are thin-walled, high-precision components with delicate ground bores highly susceptible to oval deformation, scratching, and oxidation, we utilize specialized protective packaging: all open ports are capped with plastic plugs to prevent debris entry. Components are coated in anti-rust oil and wrapped in VCI (Volatile Corrosion Inhibitor) paper. To prevent point contact and crushing, parts are separated by custom multi-layer EPE foam slots or nested vertically in rigid blister trays, packed in sturdy export-grade double-wall cartons to ensure zero deformation during international transit.
FAQ
Thin-walled tubes naturally deform under clamping and cutting pressure. We mitigate this by using custom collets, expanding mandrels, and soft jaws that distribute clamping force evenly across a larger surface area. Additionally, we utilize sharp carbide tooling with optimized shallow depth of cuts and minimal radial forces on our Swiss lathes, ensuring the cylindricity of the ID and OD is maintained.
The inner bore must provide a smooth path for the rotating shaft or seal. After CNC boring, we utilize precision internal cylindrical grinding or horizontal honing machines. This removes any tool marks, corrects microscopic taper, and creates a specific cross-hatch pattern (Ra 0.2) that retains lubricating oil, significantly extending the operational lifespan of both the sleeve and the shaft.
Yes. Lubrication grooves are critical but notorious for trapping burrs. We utilize synchronized live tooling on our CNC lathes to precisely mill spiral or axial oil grooves. This is immediately followed by specialized back-chamfering tools and thermal energy deburring (TEM) to vaporize any micro-burrs, guaranteeing a 100% smooth internal path.
For high-speed applications requiring continuous self-lubrication, we highly recommend C36000 free-cutting brass or high-leaded tin bronze. These materials possess excellent embeddability, allowing dust and debris to be pressed into the soft metal rather than scoring the shaft, while also providing superior frictional compatibility.
Hardening thin-walled steel sleeves naturally induces slight ovalization and micro-warping. We account for this by leaving a specific grinding allowance (typically 0.2-0.3mm) on critical diameters before heat treatment. Post-quenching, we utilize precision internal and external cylindrical grinders to systematically remove the deformed layer, restoring exact cylindricity and coaxiality tolerances.
Yes. With over 30 years of experience supplying the automotive industry, we are fully compliant with PPAP (Production Part Approval Process) requirements. We provide complete documentation, including dimensional layouts, material mill certificates, capability studies (Cpk/Ppk), and measurement system analysis (MSA) to ensure seamless integration into your supply chain.
