CUSTOM CNC MILLING SERVICES
Our CNC milling process delivers custom parts in as fast as 1 day. We use both 3-axis and 5-axis indexed CNC milling to machine parts from over 30 engineering-grade plastics and metals. For larger orders, we offer competitive pricing along with first article inspection (FAI) reporting, material certifications, and finishing options like anodizing and chromate plating.
Tolerances for CNC Milling
Our CNC milling capabilities provide reliable tolerances for a wide range of industrial applications, from automotive components to general fabrication.
Practical Tolerance Capabilities by Axis Configuration
| Axis Configuration | Standard Tolerance | Tight Tolerance (Additional Cost) | Primary Applications |
|---|---|---|---|
| 3-Axis CNC Milling | ±0.1 mm (≈±0.004") | ±0.05 mm (≈±0.002") | Flat components, brackets, plates, simple geometries accessible from one side |
| 4-Axis CNC Milling | ±0.075 mm (≈±0.003") | ±0.025 mm (≈±0.001") | Parts requiring machining on multiple faces, cam profiles, indexed features, radial patterns |
| 5-Axis CNC Milling | ±0.05 mm (≈±0.002") | ±0.02 mm (≈±0.0008") | Complex contours, angled features, multi-sided components, freeform surfaces |
Tolerance Capabilities by Feature Type
| Feature Type | Standard Tolerance | Tight Tolerance | Notes |
|---|---|---|---|
| Linear Dimensions | ±0.1 mm | ±0.025 mm | Most cost-effective for general applications |
| Hole Diameters (Drilled) | ±0.05 mm | ±0.012 mm | Standard drill sizes recommended for best results |
| Bore Diameters | ±0.025 mm | ±0.008 mm | Requires boring operations; higher precision than drilled holes |
| Pocket/Step Dimensions | ±0.1 mm | ±0.025 mm | Dependent on tool deflection and depth |
| Angular Dimensions | ±0.5° | ±0.25° | 5-axis preferred for tight angular tolerances |
| Surface Flatness | 0.1 mm | 0.025 mm | Large surfaces may have variation |
| Position (GD&T) | 0.1 mm | 0.025 mm | Referenced to datums |
CNC Milling Design Guidelines
Ensure optimal results by following recommended design guidelines for CNC machined parts. These guidelines help achieve precision, efficiency, and manufacturability.
| Design Feature | Recommended Value | Feasible Value |
|---|---|---|
| Minimum Feature Size | Ø 2.5 mm | Ø 0.50 mm |
| Internal Corner Radius | ≥ 1/3 cavity depth (or larger) | R 0.5 mm |
| Minimum Wall Thickness | 0.8 mm (metals) 1.5 mm (plastics) |
0.5 mm (metals) 1.0 mm (plastics) |
| Holes (Drilling) | Diameter: Standard drill sizes Depth: ≤ 6 × diameter |
Diameter: Ø 0.5 mm Depth: 10-12 × diameter |
| Pockets & Cavities | Depth ≤ 4 × width | Depth ≤ 10 × width |
| Threads | Size: M4 or larger Length: 1.5 × diameter |
Size: M2 Length: 3 × diameter |
| Text & Engraving | Character height ≥ 5 mm Line width ≥ 0.8 mm |
Character height ≥ 2 mm Line width ≥ 0.3 mm |
| Draft Angle (for molds) | 3° per side | 1° per side |
CNC Milling Materials
With Hotean’s CNC Milling services, we provide an extensive selection of metals and plastics, enabling precision machining for custom parts and prototypes. Our wide range of materials ensures durability and high-quality results, giving clients the flexibility to optimize performance for every unique project. More
| Metals | Description | Price |
|---|---|---|
| Aluminum | Lightweight, corrosion-resistant, good thermal conductivity, ideal for precision parts. | $ |
| Brass | Durable, easy to machine, with a distinctive golden appearance. | $$$ |
| Bronze | High strength and corrosion resistance, suitable for bearings and bushings. | $$$ |
| Steel | Versatile structural metal, wide range of hardness, used in many applications. | $$$ |
| Magnesium | Lightest structural metal, perfect for weight-sensitive designs. | $$$ |
| Titanium | Excellent strength-to-weight ratio, corrosion-resistant, used in aerospace and medical. | $$$ |
| Plastics | Description | Price |
|---|---|---|
| ABS | Tough, impact-resistant, easy to machine with good thermal stability. | $ |
| PC (Polycarbonate) | High-impact strength, crystal-clear transparency, heat-resistant for precision parts. | $$$ |
| PMMA (Acrylic) | Excellent optical clarity and UV-resistance, easy to machine for aesthetic parts. | $$$ |
| POM (Acetal) | Rigid, low friction, excellent dimensional stability and wear resistance. | $$$ |
| PE (Polyethylene) | Great chemical resistance, low friction, shock-absorbent and lightweight functional material. | $$$ |
| PEEK | High-performance polymer: outstanding thermal, mechanical and chemical resistance. | $$$ |
CNC Milling Surface Finishes
Optimize the look and performance of your custom CNC milled parts with expert surface finishing. Our finishes improve aesthetics, enhance protection, and boost part strength and longevity. More Surface Finishes >>>
Start Your CNC Machining Project
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FAQs
MOST FREQUENT QUESTIONS AND ANSWERSQ1. What is your production capacity for CNC milling?
A1: We have a wide range of CNC milling machines, including 3-axis and 5-axis machines, which can handle both small and large volume orders. Our production capacity allows us to scale according to your needs, whether you're looking for a single prototype or a full production run of thousands of parts. We are committed to meeting tight deadlines without compromising on quality.
Q2. Can you handle custom designs and provide tailored solutions?
A2: Yes, we specialize in custom CNC milling services. Whether you need a completely unique design or have specific modifications to an existing part, our team can bring your vision to life. Our engineers collaborate closely with you to optimize designs for manufacturability, ensuring the most cost-effective and precise outcome for your custom parts.
Q3. What tolerances can you achieve with CNC milling?
A3: We can achieve tolerances as tight as ±0.001 inches (±0.025 mm) depending on the material and part complexity. Our advanced CNC machines and skilled operators ensure that even highly intricate parts are produced with precision. We also offer additional finishing services to ensure that your parts meet your exact requirements, whether it’s surface finish or critical dimensions.
Q4. Can you provide prototypes and low-volume production runs?
A4: Yes, we offer rapid prototyping services, allowing you to test and validate your designs before committing to large-scale production. We also specialize in low-volume production runs, which means you can order small batches with high precision and quality, making us a perfect partner for both prototyping and limited production runs.
Q5. How long will it take to produce my custom CNC milled parts?
A5: Lead time depends on the complexity of the design and order quantity. For most custom CNC milling projects, we can provide parts in as little as a few days to a couple of weeks. We provide accurate lead time estimates upon reviewing your project, and we always strive to meet your deadlines without sacrificing quality.
Q6. What materials can you work with for custom CNC milling?
A6: We can work with a wide range of materials, including metals (aluminum, stainless steel, titanium, brass, etc.), plastics (Delrin, ABS, PVC, etc.), and composites. Whether your project requires lightweight materials, high-strength alloys, or specialized materials, we have the expertise to deliver precise parts that meet your material specifications.
Q7. How do you ensure consistent quality across multiple batches?
A7: We use advanced CNC technology combined with robust quality control processes to ensure consistent results across all batches. Each batch is inspected to meet the same high standards, and we maintain detailed records of every production run. This approach ensures that every part, whether it's the first or the thousandth, matches your specifications.
Q8. What steps do you take to ensure the precision of complex parts?
A8: For complex parts, we use 5-axis CNC milling machines that allow us to machine multiple sides of a part in a single setup, ensuring precision and consistency. We also employ advanced CAD/CAM software to simulate the entire machining process, minimizing the risk of errors and optimizing tool paths for maximum accuracy.
Q9.Do you offer post-processing and finishing services?
A9: Yes, we offer a wide range of post-processing services, including surface finishing (such as anodizing, powder coating, polishing), heat treatment, and assembly. We work with trusted partners for specialized finishes and coatings to ensure your parts are ready for use as soon as they leave our shop.