CNC (computer numerical control) milling is a high-precision machining technology that uses a rotating milling cutter to remove material from a workpiece to produce complex two-dimensional and three-dimensional parts. The following is a detailed description of the precision and surface finish of CNC milled parts:

Precision
The precision of CNC milling depends on several factors, including the accuracy of the machine tool, the quality of the milling cutter, the accuracy of programming, and various conditions during the machining process.

Machine tool accuracy:
CNC milling machines generally have high repeatability, usually ranging from a few microns (μm) to tens of microns.
The structural stability of the machine tool, the accuracy of the guide rails, and the spindle runout all affect the final machining accuracy.
Milling cutter:
The size, shape, and quality of the milling cutter have a direct impact on the machining accuracy. Precision milling cutters can produce finer details and higher dimensional accuracy.
Programming:
CNC programming software can accurately control the tool path, reduce human errors, and improve the machining accuracy of parts.
Machining conditions:
The reasonable selection of parameters such as cutting speed, feed rate, and cutting depth can improve machining accuracy.
Generally, CNC milling can achieve the following accuracy levels:

IT7 to IT8 (ISO 2768-1) for general industrial applications.
For high-precision machining, it can reach IT6 or even higher.
Surface treatment
The surface treatment of parts after CNC milling is to improve appearance, improve corrosion resistance, enhance wear resistance or meet specific functional requirements. The following are some common surface treatment methods:

Grinding and polishing:
Fine grinding can further improve the surface finish of parts, reduce roughness and achieve a mirror effect.
Polishing can remove minor surface defects and improve the appearance quality.
Anodizing:
For aluminum parts, anodizing can form a protective oxide film to improve corrosion resistance and hardness.
Electroplating:
Electroplating can deposit a layer of metal such as nickel, chromium, zinc, etc. on the surface of parts to provide protection or decorative effects.
Coating:
Application of technologies such as PVD (physical vapor deposition) and CVD (chemical vapor deposition) to coat a layer of hard materials such as titanium carbide, titanium nitride, etc. on the surface of parts to improve wear resistance and corrosion resistance.
Painting and coating:
Painting can provide a variety of colors and effects, while providing a certain degree of protection.
Heat treatment:
Heat treatment can change the hardness, strength and toughness of parts, which is essential for improving the wear resistance and extending the service life of parts.
The precision and surface treatment of CNC milling parts are key factors to ensure the quality and performance of parts. They need to be customized according to specific engineering requirements and application environments. Through precise processing parameters and appropriate post-processing processes, CNC milling can produce precision parts that meet various industrial standards.

FAQ:

Q1: Are you a factory or a trading company?
A1: We are a factory, located in Tangxia, Dongguan, China. Welcome to visit our factory.

Q2: What are our advantages compared with other companies?
A2:1). Manufacturing, low procurement cost, competitive price.
2). With 15 years of experience.
3). Fast delivery: Our company promises to provide on-time delivery.
4). Provide OEM service.
5). Quality control: 100% inspection, inspection report can be provided if necessary.
6). Provide samples, we promise to answer any of your questions within 12 hours.

Q3. Can you strictly follow the tolerances on the drawings and meet high precision requirements?
A3: Yes, we can, we can provide high precision parts and manufacture parts according to your drawings.

Q4: How long does it take to quote?
A4: After receiving detailed information (your 2D/3D drawings or samples), we will give you a quote within 2 days.

Q5: I want to keep our design confidential, can we sign a confidentiality agreement?
A5: Yes, we can sign a confidentiality agreement, we will not show any customer design or display to others.

Q6: Can I know how my product is progressing without going to your company?

A6: Yes. We will send weekly reports with digital pictures and videos to show the production process

Q7: How do you ensure quality?

A7: We have a QC department to control quality from the beginning of production to the completion of goods. We have a full set of inspection equipment, and each batch of goods will be accompanied by a QC report.

Q8: What drawing format is required for production?

A8: Both 2D and 3D are acceptable. 2D formats such as PDF, CAD, JPG, etc. 3D formats such as STEP, STP, IGS, STL, etc.