Sanluo Precision is a specialized Chinese manufacturer and supplier dedicated to providing high-precision CNC lathe-machined parts, offering professional custom machining services to clients worldwide. We specialize in the custom production of complex and challenging parts. As a dedicated CNC lathe machining facility, Sanluo Precision is equipped with high-precision CNC machinery and staffed by a team of expert technical professionals.
Our facility features advanced equipment such as multi-axis CNC lathes, turn-mill centers, and Swiss-type sliding headstock lathes. Our team comprises numerous process engineers, quality engineers, and skilled operators—each dedicated to a specific machine—ensuring meticulous attention to detail. We provide clients with a comprehensive range of custom machining services, including external turning, internal boring, facing, thread cutting (Metric/Imperial/American standards), grooving, and more. We are capable of machining various metal parts ranging in diameter from φ0.3mm to φ800mm, continuously improving the efficiency and quality of our turning operations through the optimization of cutting tools and parameters.
CNC lathe machining is a precision cutting process in which the workpiece rotates as the primary motion while the cutting tool executes the feed motion. This process allows for the machining of shafts, discs, bores, threads, contoured surfaces, and complex rotational parts. While standard lathe operations can achieve dimensional tolerances of ±0.005mm, our advanced CNC lathes can reach a maximum precision of ±0.001mm. We maintain coaxiality within 0.002mm, achieve surface roughness levels as fine as Ra0.4μm, and meet precision grades ranging from IT6 to IT7.
Sanluo Precision specializes in the production of metal lathe parts, high-precision CNC lathe components, and parts requiring eccentric turning. Our services encompass the entire machining lifecycle—from roughing and semi-finishing to fine finishing and surface refinement. We strictly control process datums, fixturing, cutting parameters, and dimensional accuracy. With extensive experience in material treatment, geometric dimensioning and tolerancing (GD&T), and surface quality control, we serve a diverse range of industries, including precision molds, automotive components, medical devices, robotics, aerospace, drones, and smart wearables. We provide our clients with stable, efficient, and high-precision one-stop turning solutions.
Particularly for parts supplied in batches, a manufacturing facility must, above all, possess absolute control over dimensional accuracy and geometric tolerances. Sanluo Precision’s CNC lathe machining services primarily focus on turning operations for a wide range of parts—including shafts, discs, sleeves, as well as complex stepped shafts, eccentric shafts, and rotational bodies with curved surfaces. We are capable of machining diameters ranging from φ0.6 mm to φ100 mm, with a maximum length of 500 mm, thereby meeting the batch production requirements for small to medium-sized components.
We can maintain dimensional tolerances within the IT1 to IT8 grades (±0.001 to ±0.003 mm), achieve a roundness of 0.002 to 0.02 mm, and produce surface finishes with a roughness of Ra 0.2 to 1.2 μm. Our CNC systems utilize mature, industry-leading platforms—such as FANUC, SIEMENS, and the domestic brand GSK—combining 2-axis simultaneous control, C-axis indexing, and automated machining cycles. This approach ensures a batch consistency (Cpk) of ≥1.33, providing a quantifiable data foundation for high-precision machining operations.
Without a tiered configuration of CNC equipment, a CNC lathe machining facility cannot effectively satisfy the diverse delivery requirements that span the entire lifecycle—from initial prototyping to mass production. Sanluo Precision possesses a comprehensive, tiered lineup of CNC lathes, including economic-class CNC lathes, precision CNC lathes, turning centers, and large-scale CNC lathes. Our economic-class CNC lathes are suitable for machining small to medium-sized parts with diameters between φ100 mm and φ400 mm and lengths up to 750 mm, offering a cost-effective solution.
Our precision CNC lathes can achieve IT7-grade accuracy within the φ100 mm to φ300 mm diameter range; featuring spindle speeds of up to 5,000 RPM, C-axis indexing, and live tooling capabilities, these machines support integrated turn-mill operations. Our turning centers feature Y-axis simultaneous control and multiple live tools, enabling the completion of multiple processes—including turning, milling, drilling, and tapping—in a single setup, thereby boosting efficiency by approximately 60%. Finally, our large-scale CNC lathes are designed to machine substantial parts—such as shafts, discs, and sleeves—with diameters ranging from φ300 mm to φ500 mm and lengths up to 1,000 mm, capable of handling workpieces weighing between 1 and 2 tons. Equipped with 8- to 12-station tool turrets and quick-change tooling systems, our facility ensures stable production capabilities for turning operations across a wide range of part specifications.
If turning operations remain at a stage where decisions rely solely on empirical judgment—lacking the support of scientifically sound machining process controls and in-process inspection—the quality of mass production will inevitably fail to meet customer expectations. In its CNC lathe operations, Sanluo Precision employs carefully selected tool materials and geometries, alongside optimized cutting speeds and feed rates, to achieve a positioning accuracy of ±0.002 mm and a repeatability of ±0.002 mm.
By integrating CAM automatic programming with parameter optimization, we can complete complex contours and multi-step structures in a single operation. This approach minimizes setup changeover times, making it ideal for both large-scale and small-to-medium batch production runs. During in-process inspection, measurement probes capture dimensional data and transmit the results to the CNC system for automatic dimensional compensation, thereby establishing a closed-loop control system that significantly reduces human measurement errors. Our turn-mill composite machines leverage C-axis capabilities and live tooling to complete the machining of features such as eccentric surfaces, square heads, keyways, and cross-holes in a single clamping setup, thereby enhancing both dimensional consistency and production throughput.
Sanluo Precision’s high-precision machining services have been widely adopted across numerous sectors. In the field of power transmission and general machinery, for instance, we machine heat-treated 45# steel transmission shafts (with outer diameters ranging from φ30 mm to φ100 mm) to a roundness tolerance of less than 0.005 mm and a concentricity of 0.002 mm.
Additionally, we produce carburized 20CrNiMo gear shafts featuring highly precise step dimensions, thereby laying a solid foundation for subsequent gear grinding and heat treatment processes. In the automotive industry, we machine ductile iron crankshafts (with outer diameters ranging from φ40 mm to φ80 mm); following preliminary turning, these components undergo precision grinding and dynamic balancing to achieve a quality grade of G6.3.
Furthermore, we perform the precision turning and profiling of chilled cast iron camshafts, maintaining a lift accuracy tolerance of ±0.005 mm. For precision instruments and electronic equipment, our stainless steel precision spindles—featuring an outer diameter of φ20–60 mm—maintain a roundness and runout tolerance of less than 0.005 mm, with a surface roughness (Ra) of approximately 0.4 μm. Our 6061 aluminum alloy connectors, with an outer diameter of φ10–50 mm, achieve a dimensional accuracy of ±0.005 mm following turning and anodizing processes, ensuring a consistent and uniform appearance.
Additionally, our copper alloy heat dissipation components undergo precision turning and grooving to ensure both optimal thermal conductivity and precise assembly accuracy. Sanluo Precision provides CNC lathe machining services to renowned enterprises such as Huawei, BYD, and Foxconn; with an annual output of hundreds of thousands of turned parts, we have earned the long-term trust of our clients through our commitment to on-time delivery and consistent quality.
