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CNC Planetary Gear Shafts Technical Specifications
| Shaft Types | Reciprocating Saw Shafts, Orbital Sander Shafts, Impact Drill Spindles, Cam Shafts |
|---|---|
| Primary Equipment | Star CNC Swiss-type Lathes, 4-axis CNC Machining Centers, Cylindrical Grinders |
| Eccentricity Tolerance | ±0.005mm (Exact throw distance control) |
| Dimensional & Geometric Tolerances | Bearing Journals: ±0.002mm; Coaxiality (Cam to Journal): 0.005mm |
| Common Materials | 42CrMo, 40Cr, 20CrMnTi, SUJ2, 1045 Carbon Steel |
| Heat Treatment | Quenching & Tempering, Induction Hardening (HRC 55-62 on cam surface) |
| Surface Roughness (Ra) | Ground Cam & Journals: Ra 0.2 - Ra 0.4; Turned Surfaces: Ra 0.8 |
| Machining Features | Eccentric Lobes, Cross-Drilled Oil Holes, Keyways, Threaded Ends, Relief Grooves |
| Inspection Equipment | Japanese/German CMM, Roundness Testers, Hardness Testers, Dynamic Balancers |
High-Precision CNC Planetary Gear Shafts for Dynamic Motion Conversion
At Xierge Precision Machinery Co., Ltd., we leverage over 30 years of operational experience since 1990 to manufacture premium CNC Planetary Gear Shafts for the industrial machinery, automotive, and home appliance sectors. Eccentric shafts are the critical core components in power tools such as reciprocating saws, orbital sanders, and impact drills, responsible for converting high-speed rotary motion into precise oscillating or reciprocating motion. These demanding applications require the shafts to possess extreme fatigue strength, exact geometric tolerances on the eccentric cam, and absolute coaxiality with the main bearing journals. Even a microscopic deviation in eccentricity or dynamic balance can lead to severe tool vibration, premature bearing wear, and catastrophic failure under high-torque loads.
To achieve flawless results, our state-of-the-art facility is equipped with Japanese imported Star CNC Swiss-type lathes, advanced 4-axis CNC machining centers, and precision cylindrical grinders. The guide bushing technology on our Swiss lathes provides continuous, rigid support, eliminating deflection when machining complex stepped geometries and eccentric profiles. By utilizing synchronized sub-spindles and live tooling, we can turn the eccentric cam, drill cross-holes for lubrication, and mill keyways in a single continuous setup, ensuring extreme concentricity between the eccentric lobe and the bearing seats.
Following our core principle of "Integrity Oriented, Quality Foremost," we strictly adopt premium raw materials, such as 42CrMo and 40Cr alloy steel. To guarantee reliable product performance, we apply strict quality inspection protocols utilizing a complete set of testing instruments imported directly from Japan and Germany, verifying eccentricity, hardness, and runout. 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 Planetary Gear Shafts
- Ultra-Precise Eccentricity Control: Our Japanese Star CNC Swiss-type lathes and 4-axis machining centers allow us to machine eccentric lobes with exact throw tolerances (±0.005mm), ensuring smooth, balanced motion conversion without excessive vibration.
- Single-Setup Complex Machining: By utilizing synchronized sub-spindles and live tooling, we turn eccentric cams, drill cross-holes, and mill keyways in one continuous operation, maintaining absolute coaxiality and eliminating secondary clamping errors.
- High-Fatigue Material Mastery: We strictly select 42CrMo and 40Cr alloy steels, applying precise heat treatment to provide superior torsional strength and impact resistance for heavy-duty power tool applications.
- Advanced Cam Surface Grinding: Equipped with high-precision CNC cylindrical grinders, we achieve mirror-like finishes (Ra 0.2) on eccentric cam profiles, significantly reducing friction and extending bearing lifespan.
- Thermal Deformation Correction: We meticulously manage induction hardening processes and utilize precision grinding post-treatment to correct any micro-warping, restoring exact geometric tolerances on the eccentric section.
- Rigorous Dynamic Balancing: To prevent high-RPM tool chatter, we perform strict inspection protocols on runout and balance using imported Japanese and German metrology equipment, ensuring smooth power delivery.
- 3-Decade OEM/ODM Innovation: Since 1990, we have continuously innovated, collaborating closely with clients to optimize DFM (Design for Manufacturing) for custom eccentric shaft designs, 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 Planetary Gear Shafts, we accept standard T/T (Telegraphic Transfer) with a 30% advance deposit and 70% balance before shipment. For large-scale industrial or power tool manufacturing 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 eccentric shafts have complex geometries with off-center weight distribution and delicate ground surfaces highly susceptible to impact and oxidation, we utilize specialized packaging: each shaft is individually coated in anti-rust oil and wrapped in VCI (Volatile Corrosion Inhibitor) paper, secured in custom EPE foam slots or blister trays to prevent contact and absorb transit vibrations, and packed in sturdy export-grade wooden cases to ensure zero deformation during international shipping.
FAQ
Machining off-center geometries requires extreme rigidity. We utilize our Japanese Star CNC Swiss-type lathes with 4-axis Y-control and live tooling. The workpiece is held rigidly by the guide bushing and sub-spindle, allowing the milling cutter to interpolate the eccentric profile precisely relative to the central axis. This single-setup approach ensures the eccentricity tolerance and coaxiality are maintained perfectly.
The asymmetric mass of an eccentric shaft makes it prone to uneven expansion during heat treatment. We carefully control the induction heating frequency and quenching process. Prior to hardening, we leave a specific grinding allowance on the cam and journals. Post-treatment, we utilize precision CNC cylindrical grinders to systematically remove any micro-warping, restoring the exact eccentric throw and journal diameters.
Yes. Cross-holes in power tool shafts are notorious for trapping burrs that can destroy bearings. We use specialized gun drills and carbide inserts with optimized pecking cycles on our Swiss lathes. This is followed by precision back-chamfering tools, and for absolute assurance, thermal energy deburring (TEM), plus rigorous ultrasonic cleaning to guarantee a 100% clear internal path.
Standard calipers cannot accurately measure eccentricity. We utilize imported Japanese and German Coordinate Measuring Machines (CMM). The shaft is supported on V-blocks between precision centers, and the CMM probes multiple points on the main journal and the eccentric cam to mathematically calculate the exact throw distance, parallelism, and runout.
For high-impact, high-torque applications, we highly recommend 42CrMo or 20CrMnTi alloy steel. After carburizing or quenching and tempering, we apply localized induction hardening to the eccentric cam and bearing journals, achieving a surface hardness of HRC 55-62 while maintaining a tough, fracture-resistant core to absorb sudden impact loads.
While an eccentric shaft is inherently unbalanced by design, we control the mass distribution precisely through dimensional accuracy. We can machine specific relief slots or counterweight bores opposite to the eccentric cam to optimize the dynamic balance. We verify runout and geometric precision using imported roundness testers to ensure the final tool assembly remains vibration-free at high speeds.
