Sanluo, operating as Shenzhen Sanluo Precision Technology Co., Ltd., is China's premier factory and supplier for Precision Turning For Small Diameter Components. Since our founding in 2007, we have specialized in the unique challenges of manufacturing small-diameter rotational parts—where conventional CNC lathes lack the precision, rigidity, and control to meet the demanding specifications of modern high-tech industries. Our 8,000㎡ facility in Guangming District, Shenzhen, is equipped with dedicated small-diameter turning cells featuring the world's most advanced Swiss-type and high-precision CNC lathes. With a team of 230+ skilled professionals including process engineers, quality engineers, and experienced operators, we consistently deliver small-diameter components with dimensional tolerances of ±0.001mm, geometric accuracy down to 0.0003mm roundness, and surface finishes as smooth as Ra0.01μm.
Small-diameter components occupy a unique space in precision manufacturing. They are too small for conventional lathe technology but often require the same—if not higher—levels of precision as their larger counterparts. Our turning services are specifically optimized for this size category, delivering accuracy levels that were once thought impossible at these scales.
Our small-diameter turning capability spans the full range from micro-scale to medium precision components:
1. Micro-diameter range: φ0.1mm to φ2mm — for the most miniature applications in medical and semiconductor industries
2. Small-diameter range: φ2mm to φ10mm — for precision instruments, connectors, and small mechanical assemblies
3. Medium-small range: φ10mm to φ32mm — for automotive components, hydraulic parts, and industrial equipment
4. Extended range: up to φ380mm on our STC-38 platform for larger precision parts that still demand tight tolerances
Small-diameter components often come with challenging length-to-diameter ratios that can cause deflection, chatter, and dimensional errors on conventional equipment. Our Precision Turning For Small Diameter Components technology addresses these challenges head-on:
● Maximum length-to-diameter ratio: >20:1 for slender shafts and pins
● Maximum turning length: 1000mm on STC-38, up to 2000mm with extended bed options
● Guide bushing support: Swiss-type configuration supports the workpiece at the cutting zone, eliminating deflection
Precision turning for small-diameter components demands exceptional dimensional control. At small scales, even microscopic variations can represent a significant percentage of the part's total dimension, potentially rendering it non-functional. Our turning processes maintain the tightest tolerances in the industry, verified by state-of-the-art metrology.
|
Dimension Type |
Symbol |
Tolerance (±mm) |
Accuracy Grade |
|
Outer Diameter |
OD |
0.001 |
IT0 - IT3 |
|
Inner Diameter |
ID |
0.001 |
IT0 - IT3 |
|
Depth / Position |
DP |
0.001 |
IT1 - IT4 |
|
Slot Width |
SW |
0.002 |
IT2 - IT5 |
|
Step Height |
SH |
0.002 |
IT2 - IT5 |
For small-diameter components, geometric accuracy is often as critical as dimensional accuracy. We maintain the following geometric tolerances:
● Roundness: 0.0003mm to 0.001mm — critical for bearing surfaces and sealing applications
● Coaxiality: 0.0005mm to 0.001mm — essential for multi-step shafts and rotating assemblies
● Cylindricity: 0.001mm — important for hydraulic spools and piston applications
● Symmetry: 0.001mm — for keyways, flats, and symmetric features
● Concentricity: 0.001mm — for balanced rotating components
Surface quality takes on heightened importance in small-diameter components. The relative impact of surface roughness increases as part size decreases, and many small-diameter applications—such as medical implants, bearing surfaces, and sealing elements—demand exceptionally smooth finishes.
Our Precision Turning For Small Diameter Components delivers outstanding surface quality across the full range of small-diameter components:
1. Standard precision finish: Ra0.4 - 0.8μm — for general mechanical applications
2. High-precision finish: Ra0.1 - 0.4μm — for bearing and wear surfaces
3. Ultra-precision finish: Ra0.05 - 0.1μm — for sealing and high-pressure applications
4. Mirror finish: Ra0.01 - 0.05μm — for medical implants, optical components, and the most demanding applications
The surface finish of a small-diameter component directly affects its performance and service life:
● Wear resistance: smoother surfaces reduce friction and extend component life
● Sealing performance: mirror finishes enable effective sealing even at high pressures
● Biocompatibility: ultra-smooth surfaces minimize bacterial adhesion and tissue irritation
● Fatigue strength: improved surface finish reduces stress concentration and improves fatigue life
● Corrosion resistance: smoother surfaces are less susceptible to corrosion initiation
Small-diameter precision turned components are found in virtually every high-tech industry, enabling functionality that would be impossible with larger-scale manufacturing. Here are some of the key application areas we serve:
The medical industry is one of the largest consumers of small-diameter precision components, driven by the trend toward minimally invasive surgery and implantable devices. We produce:
● Stent delivery system components: small-diameter tubing and shafts for catheter-based interventions
● Surgical instrument tips: micro-scalpels, forceps jaws, and manipulator elements
● Dental implant components: precision abutments and screw components
● Drug delivery device parts: precision metering components for insulin pumps and other delivery systems
As electronic devices continue to shrink, the components inside them must become ever smaller and more precise:
● Connector pins and sockets: high-density electrical connectors with hundreds of contacts
● Semiconductor test probes: fine-pitch probe pins for wafer-level testing
● Fiber optic ferrules: precision alignment components for optical communication
● Micro-motor shafts: for compact motors in consumer electronics and automotive systems
Modern vehicles contain hundreds of small-diameter precision components, particularly in fuel systems, transmissions, and sensors:
● Fuel injector components: needle valves and nozzle elements with IT3 grade precision
● Transmission parts: small shafts, pins, and valve body components
● Sensor elements: precision housings and magnetic core components
● Brake system parts: valve components and piston elements
From scientific laboratories to manufacturing floors, precision instruments rely on small-diameter turned components:
●Micrometer and caliper components
● Optical instrument parts: lens barrels, focus mechanisms, and alignment pins
● Watch and clock movement parts: tiny shafts, gears, and jewels
● Laboratory equipment components: for analytical instruments and research apparatus
Our ability to deliver precision turning for small-diameter components is built on a foundation of world-class equipment. We have carefully selected and configured our machine fleet to optimize for small-diameter precision, investing in the most advanced turning technology available.
The SwissNano is our flagship machine for small-diameter precision turning, purpose-built for the demands of micro and small component manufacturing.
|
Parameter Category |
Parameter Details |
|
Equipment Model |
SwissNano |
|
Core Positioning |
Swiss-type ultra-precision lathe for micro-component turning |
|
Axis Number |
7-axis |
|
Spindle System |
Main spindle speed 10,000-50,000 rpm, sub-spindle speed 10,000-40,000 rpm |
|
Key Accuracy |
Machining accuracy ±0.0001mm, surface roughness Ra0.01μm |
|
Machining Range |
Bar diameter φ0.1-φ32mm |
|
Structural Features |
Swiss-type structure, high precision guide rail, thermal error compensation |
|
CNC System |
Siemens 840D sl |
|
Typical Application |
super precision turning of micro-shaft parts, medical micro-components |
For small-diameter components at the upper end of the size range, or for parts requiring high material removal rates, our STC-38 provides exceptional rigidity and precision.
|
Parameter Category |
Parameter Details |
|
Equipment Model |
STC-38 |
|
Core Positioning |
High-precision CNC lathe for super precision turning |
|
Axis Number |
2-axis (X, Z) |
|
Spindle System |
High-precision spindle, rotation accuracy 0.0001mm |
|
Key Accuracy |
Repeat positioning accuracy ±0.0001mm, positioning accuracy ±0.0002mm |
|
Machining Range |
Maximum turning diameter φ380mm, maximum turning length 1000mm |
|
CNC System |
FANUC 0i-TF Plus |
|
Core Advantage |
High rigidity, high precision, high efficiency |
|
Typical Application |
super precision turning of shaft parts, disc parts |
When you partner with Sanluo for Precision Turning For Small Diameter Components, you are working with a company that has dedicated nearly two decades to perfecting this specialized craft. Here is what sets us apart:
Unlike general-purpose machine shops that try to handle everything, we have built our entire business around precision machining of small, complex, high-tolerance components. This focus means our engineers, our equipment, and our processes are all optimized for exactly what you need—small-diameter precision turning of the highest caliber.
With a 99.9% qualification rate across 500,000 annual pieces, our quality track record speaks for itself. We have earned the trust of industry leaders including Bosch, Delphi, Medtronic, and Siemens, who rely on us for their most critical small-diameter components.
We offer more than just machining. From design for manufacturability review to material selection guidance, from prototype development to volume production, from surface treatment integration to final assembly support—we provide a complete solution that simplifies your supply chain and reduces your management overhead.
A: Our primary small-diameter turning range is φ0.1mm to φ32mm on our SwissNano ultra-precision lathe. For larger diameters up to φ380mm that still require high precision, we use our STC-38 high-precision CNC lathe. We can handle the full spectrum from micro-components to medium-sized precision parts.
A: We can consistently hold ±0.001mm tolerance on outer and inner diameters for small-diameter components. This corresponds to IT0-IT3 accuracy grade, depending on the specific diameter. For critical applications, we can achieve even tighter tolerances with specialized process development.
A: Yes, our 7-axis SwissNano machine can machine both external and internal features, including boring, internal threading, and internal grooves. The main and sub-spindle configuration allows us to machine both ends of the part in a single setup, ensuring perfect alignment between all features.
A: Our MOQ is just 1 piece. We support everything from single prototype development to high-volume production runs of up to 999,999 pieces. Our flexible production system allows us to efficiently handle both small batch and large volume orders with the same level of precision.
A: We implement Statistical Process Control (SPC) with a CPK (Process Capability Index) of ≥2.0 for all critical characteristics. Our diamond tool management system, with wear compensation of ±0.0001mm, ensures consistent tool performance. Every batch undergoes 100% inspection of critical dimensions before shipment.
A: Yes, we can integrate a wide range of surface treatments including vacuum heat treatment, anodizing, gold plating, silver plating, passivation, nitriding, ion polishing, and wear-resistant coatings. These secondary processes can enhance the performance and durability of your small-diameter components.
A: Production cycles typically range from 3 to 20 days depending on part complexity, material, and order quantity. Simple parts in standard materials can be completed in 3-5 days, while complex multi-feature components with special materials may require 15-20 days. We also offer expedited services for urgent projects.
