CNC Grinding
Our fine CNC grinding machines and skilled technicians ensure that every part we produce has an excellent surface finish and strict tolerances.
ISO
ISO9001.2015 Certified
CNC machines
Plastic & metal materials
CNC parts made monthly
Our clientswe work with
CNC Grinding Surface Finishes
CNC Grinding Surface Finishes
Precision CNC grinding achieves exceptional surface smoothness and tight micro-inch tolerances on flat, internal, and external cylindrical surfaces. Standard ground components reach Ra 0.2–0.8 µm, while fine superfinishing achieves a mirror quality down to Ra ≤ 0.05–0.1 µm.
Surface Grinding
High-precision grinding for flat workpieces, ensuring strict flatness and parallelism. Ideal for mold inserts, plates, and reference blocks.
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Large Surface Grinding
Precision grinding for large-format plates and heavy mold bases. Delivers consistent flatness, thickness control, and long-span accuracy.
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Combined Internal & External Cylindrical Grinding
High-accuracy ID and OD grinding for shafts, sleeves, and rotary parts. Guarantees tight concentricity, roundness, and micro-inch finish.
Request-a-quoteCNC Grinding Capabilities
Our precision CNC grinding services offer exceptional accuracy and surface consistency tailored for your critical components. We process prototypes, mold inserts, and custom precision parts to meet strict engineering tolerances and tight delivery schedules.
Surface Grinding
Surface grinding utilizes high-speed rotating wheels to produce smooth, ultra-flat surfaces on metals and hard alloys. It ensures precise thickness control, strict parallelism, and excellent surface finishes for mold plates, inserts, and reference blocks.
Cylindrical Grinding
Cylindrical grinding is designed for machining external and internal cylindrical surfaces on shafts, sleeves, and rotational parts. It achieves micro-inch surface finishes and guarantees high dimensional accuracy, roundness, and tight concentricity.
Materials for CNC Grinding
We precision-grind a wide range of tool steels, stainless alloys, and engineering metals to suit demanding application specs. Our expertise in hardened materials guarantees high dimensional stability, minimal thermal distortion, and exceptional surface finish.
Copper
Steel
Stainless Steel
Steel (Mild Steel & Hardened Steel)
Brass (C360, C260)
Nylon
Stainless Steel (303, 304, 316, 17-4)
Copper (C110, C101)
Copper
Steel
Stainless Steel
Steel (Mild Steel & Hardened Steel)
Brass (C360, C260)
Nylon
Stainless Steel (303, 304, 316, 17-4)
Copper (C110, C101)
Titanium
CNC Grinding Surface Finishes
Precision CNC grinding produces ultra-smooth surface finishes and tight micro-inch tolerances on hardened steel, stainless alloys, and custom components. Designed to eliminate heat-treatment distortion, it achieves standard surface roughness down to Ra 0.2–0.8 µm, with fine superfinishing reaching mirror quality (Ra ≤ 0.05–0.1 µm). Secondary surface enhancements—such as polishing, passivation, or PVD wear-resistant coatings—can also be applied to maximize component service life.
As machined
This finish leaves the surface directly from the CNC machine, providing a cost-effective option with visible tool marks.
Sanding & Polishing
This process smooths the surface by removing tool marks, resulting in a refined finish with varying levels of gloss and texture.
Sand, Bead Blasted
This process creates a uniform, matte texture by propelling fine abrasive particles onto the surface, removing imperfections and tool marks.
Painted
A protective and aesthetic coating is applied to the surface, offering a smooth, uniform finish with customizable colors and textures.
Powder coat
A durable, wear-resistant finish applied electrostatically and cured under heat, providing a uniform, protective coating in various colors.
Anodized
An electrochemical process that enhances surface durability, corrosion resistance, and appearance, available in various colors with a smooth or matte finish.
E-Coating
An electrostatically applied coating that provides a uniform, corrosion-resistant finish with excellent adhesion, commonly used for protective and aesthetic purposes.
Nickel Plating
An electrostatically applied coating that provides a uniform, corrosion-resistant finish with excellent adhesion, commonly used for protective and aesthetic purposes.
CNC Grinding Tolerances
We apply strict grinding tolerances based on component geometry, material hardness, and operational requirements. While standard grinding achieves precise dimensional consistency, ultra-tight tolerances (down to ±0.001 mm) can be routinely delivered for critical mold and machine components.
| 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, Taidexing 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.
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Can you provide surface finish reports and inspection certificates?
Absolutely. Upon request, we can provide:
Surface roughness reports (e.g. Ra value inspection)
CMM inspection reports
Material certificates
Dimensional inspection reports
We are committed to full transparency and traceability for critical applications.
Do you support both low-volume and high-volume CNC grinding projects?
Yes. Whether you need a single prototype or thousands of production parts, we can scale our CNC grinding operations accordingly. We often support customers from the early prototyping phase through to full-scale manufacturing.
Which materials can be CNC ground at FastPreci?
We support a wide range of materials for CNC grinding, including:
Metals: Tool steel, stainless steel, hardened steel, aluminum, titanium, brass
Hard-to-machine alloys: Inconel, tungsten, molybdenum
Specials: Ceramics (limited to external grinding), carbide, and more
If you’re unsure about your material’s grindability, feel free to send us a sample or technical spec.
How fast can you deliver CNC ground parts for prototypes or urgent orders?
For prototype parts or urgent projects, our lead time can be as fast as 3–7 working days, depending on complexity and quantity. We also offer expedited services—please consult us with your delivery deadline for a tailored production plan.
What is the tightest tolerance you can achieve with CNC grinding?
We can achieve tolerances as tight as ±0.001 mm, depending on part geometry, material, and grinding type. For parts with ultra-high precision requirements, we recommend providing detailed drawings or CAD models so our engineers can assess the best approach.
Contact Information
Email: liu.ji@cq-taidexing.com
Address: No. 2 Xishan Road, Biquan Subdistrict, Bishan District, Chongqing City
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