Precision CNC Grinding Services
Our fine CNC grinding machines and skilled technicians ensure that every part we produce has an excellent surface finish and strict tolerances.
CNC Grinding Capabilities
Surface Grinding
Surface Grinding is used to machining parts with smooth, flat surfaces. A rotating grinding wheel grinds the surface of the parts to remove material and achieve precise finishes. This method is typically used to manufacture parts with tight tolerances and flat surfaces.
Cylindrical Grinding
Cylindrical grinding involves grinding cylindrical or rod-shaped parts to achieve precise dimensions and surface finishes. In cylindrical grinding, the part involved is rotated at a specified diameter while the grinding wheel is moved along its length, removing material to form a cylinder.
Advantages of CNC Grinding
CNC grinding excels in subtractive manufacturing with unmatched accuracy, repeatability, and surface finish, ensuring consistent excellence for high-performance components across various industries. CNC grinding offers micron-level precision, repeatable quality, and versatile capabilities, crucial for part performance and production success.
Exceptional Dimensional Accuracy
Attains tight tolerances down to ±0.001 mm, meeting critical application requirements through advanced multi-axis control and in-process gauging.
Superior Repeatability for Batch Production
Ensures each workpiece maintains the same quality level, from the first to the thousandth, reducing waste and rework.
Outstanding Surface Finish
Delivers mirror-like finishes as fine as Ra 0.2 μm, ideal for components requiring low friction, high sealing performance, or tight mating interfaces.
Flexibility Across Part Shapes & Materials
Adapts to complex geometries and hard-to-machine materials, including tool steels, ceramics, and superalloys.
Integration with Other Processes
Compatible with turning, milling, and EDM, serving as a final precision step or an intermediate operation in hybrid manufacturing.
Ideal for High-Precision, Critical Industries
Essential in aerospace, medical, optical, and defense sectors, meeting the strictest standards for accuracy and reliability.
CNC Grinding Tolerances
Our CNC grinding processes ensure tight tolerances on key part features, maintaining dimensional integrity and superior fit for assemblies.
| Feature | Standard Tolerance | Tightest Achievable Tolerance |
| Outer Diameter (OD) | ±0.005 mm | ±0.001 mm |
| Inner Diameter (ID) | ±0.005 mm | ±0.001 mm |
| Flatness | 0.01 mm | 0.002 mm |
| Parallelism | 0.01 mm | 0.003 mm |
| Cylindricity | 0.005 mm | 0.002 mm |
| Roundness | 0.003 mm | 0.001 mm |
| Surface Finish (Ra) | ≤ 0.8 μm | ≤ 0.2 μm |
| Length (up to 100 mm) | ±0.01 mm | ±0.005 mm |
| Angle Tolerance | ±0.1° | ±0.01° |
For CNC grinding processes, FastPreci typically works to tighter tolerances than ISO 2768, depending on the material and application requirements. While ISO 2768-m or f may be used for non-critical dimensions, we commonly apply custom precision tolerances for ground surfaces to meet high-accuracy demands.
Industries Served by CNC Grinding
FastPreci’s CNC grinding services deliver ultra-fine surface finishes, exceptional dimensional accuracy, and tight geometric control for parts that demand high precision. Using advanced grinding equipment and process controls, we support prototype and production requirements across demanding engineering industries.
Robotics
Grinding is key for robotic motion parts where exceptionally smooth surfaces and consistent profiles reduce wear and enable precise movement. High-accuracy grinding provides surfaces that mating parts can repeatably engage.
Key Applications:
Robot joint pins, Servo motor shafts, End-effector parts, Precision gear blanks
Benefits:
- Ultra-tight tolerances for smooth robotic motion
- Consistent quality for repeatable robotic performance
- Support for complex geometries and small batch runs
Medical Devices
CNC grinding is pivotal in the fabrication of medical devices, where it facilitates the creation of ultra-precise, biocompatible components. This process guarantees adherence to stringent tolerances and delivers impeccable surface finishes, thereby satisfying both regulatory stipulations and functional imperatives.
Key Applications:
Surgical tool components, Orthopedic pins and rods, Implant-grade shafts, Valve seats
Benefits:
- Micro-level precision for critical medical applications
- Compatibility with stainless steel, titanium, and cobalt-chrome
- Cleanroom-ready surface finishes for sterilization
Aerospace
Aerospace parts often require both strict geometric tolerances and high surface integrity for fatigue resistance, sealing, and fit. CNC grinding ensures that critical bearings and shaft surfaces meet aerospace precision standards.
Key Applications:
Bearing journals, Ground shafts, Spindle surfaces, Landing gear interfaces
Benefits:
Exceptional roundness and straightness control
High surface quality to reduce fatigue stress
Reliable performance from prototype to small batches
Electronics
CNC grinding is particularly adept at producing high-precision metal components with cosmetic-grade finishes, making it an excellent choice for smartphones, laptops, and other high-end electronics. This method is not only ideal for crafting functional parts but also ensures they meet stringent aesthetic standards.
Key Applications:
Camera housings, Button shafts, Connector sleeves, Heat dissipation components
Benefits:
- Smooth surface finish for aesthetic appeal and tactile quality
- Tight tolerances for compact assemblies
- Scalable production for consumer product launches
Automation
CNC grinding ensures components used in automated systems maintain consistent motion, low friction, and tight fits required for repeatability and uptime. Its ability to deliver fine surface quality makes it ideal for precision automation hardware.
Key Applications:
Guide rails, Linear bearing shafts, Precision spacers, Wear-resistant bushings
Benefits:
- Exceptional dimensional stability under continuous motion
- Superior surface finish for reduced wear and longer part life
- High precision fit for motion-critical assemblies
Renewable Energy
Renewable systems need parts with surfaces and fits that promote durability and reduce energy loss. CNC grinding delivers the tight dimensional control and finish required for components that operate in demanding conditions
Key Applications:
Battery mold inserts, Rotor shafts, Fuel cell plate blanks, Motor end caps
Benefits:
- High wear resistance for extended service life
- Compatibility with hardened steels and exotic alloys
- Precision control for emerging energy technologies
Semiconductor
Semiconductor equipment components often require nano-level surface finishes and geometric precision, especially where vacuum sealing, motion, or sensor alignment is involved. CNC grinding excels in controlling these parameters.
Key Applications:
Vacuum sealing surfaces, Precision guide rods, Ground fixture plates, Actuator journals
Benefits:
Ultra-fine surface finish for sealing and motion
Stable geometry for high-accuracy assemblies
Ideal for prototype and low-volume production
Automotive
CNC grinding is essential in automotive parts where precision surface finish and controlled geometry reduce friction, improve fit, and extend service intervals. Turned and ground components are abundant in drivetrains and control systems.
Key Applications:
Crankshaft journals, Precision rocker shafts, Ground transmission pins, Bearing surfaces
Benefits:
Tight tolerances for durable assemblies
High surface integrity for wear resistance
Flexible for prototyping and production volumes
Why Choose FastPreci
Fast
Lead time as fast as 3 days, accelerating your R&D and production progress, easily meet tight deadlines.
Precision
Tolerances as tight as 0.005mm, rich experience with advanced 5-axis CNC machines, mill-turn machines, and precision grinding machines, meets a variety of tolerance requirements.
Cost-effective
According to your functionality and quantity requirements, develop the optimal manufacturing process, combined with efficient self-owned factories to achieve optimal performance and cost.
One-stop Solution
From CNC machining to aluminum extrusion and heat treatment to surface finishing, from prototyping to mass production, easily and efficiently customize various parts.
Strict Quality Control
ISO 9001 quality management system certification, equipped with various quality inspection instruments including Zeiss coordinate, process and results can be controlled.
Dedicated Service
A dedicated account manager is available to provide fast response, individualized service, full support, and easy management of complex projects.
CNC Grinding Resources
