Available CNC Machining Surface Finishing

• As Machined

  A machined finish comes directly from the CNC machine, offering a cost-effective option that retains tool marks on the surface.

• Anodizing

  Anodizing not only provides beautiful appearance color, but also improves the hardness and durability of the workpiece. In some cases, it is more ideal than painting.

• Sand Blasting

  Sandblasting is the process of spraying fine sand onto the workpiece through high-pressure airflow, which removes burrs and stains on the surface of the workpiece while forming a unique texture. Sandblasting can be used as a final treatment or as a preparation for subsequent surface treatment to increase the bonding strength between the workpiece and the coating or plating layer.

• Painting

  Experienced spray painting masters can mix thousands of colors and provide matte, semi-gloss and full-gloss surface effects. Thanks to our strict quality control, all products can be sprayed with uniform thickness and no color difference.

• Powder Coating

  Utilize professional equipment to apply electrostatic powder to the workpiece surface, creating a uniform coating with various effects. Powder coating provides a thick, wear-resistant layer available in a wide range of colors and textures, making it suitable for diverse surfaces.

• PVD

  PVD is an environmentally friendly coating process with the characteristics of high hardness, wear resistance, corrosion resistance, high chemical stability and long life. The products treated by this process have very dazzling color effects and rich layers, which greatly improves the ornamental value of the products.

• Electrophoresis

  This process can make the inner layer, depression, weld and other parts of the workpiece obtain a uniform and smooth paint film, solving the problem that other treatment methods are difficult to coat workpieces with complex shapes, and the product has a long-lasting bright color and good corrosion resistance.

• Electroplating

  Electroplating applies a thin metal layer to components, enhancing wear resistance, corrosion resistance, and surface conductivity. This process encompasses various methods, including vacuum electroplating, UV electroplating, plastic electroplating, and metal electroplating. Its widespread technology is ideal for mass production and facilitates mechanization and automation.

• Passivation

  Passivation exhibits characteristics that change the color of the workpiece without increasing its thickness, thereby enhancing the precision of the product and improving the corrosion resistance of the metal. This process also maintains the metal surface’s original characteristics and increases its added value.

• Laser Engraving

  Laser engraving produces intricate, clear, and beautiful logos and patterns that resist wear and fading from touch, temperature changes, and other factors. This method can engrave complex designs and images on both metal and non-metal materials.

• Silkscreen Printing

  The silkscreen printing process can be freely matched with various inks and coatings to make the pattern colorful, bright, and three-dimensional, and can be applied to various materials and shapes.

• Polishing

  Polishing produces a high-gloss finish by minimizing surface roughness and enhancing the visual appeal of metals.

• Brushed Finish

  A brushed finish imparts a unidirectional satin texture, effectively minimizing the visibility of marks and scratches on the surface.

• Black Oxidize

  Black oxidize is a conversion coating for ferrous metals that enhances corrosion resistance and reduces light reflection.

• Electropolish

  Electropolish is a chemical process that polishes and brightens surfaces while enhancing corrosion resistance.

• Alodine

  Alodine coating offers corrosion protection and enhances paint adhesion, primarily applied to aluminum surfaces.

• Heat Treatment

  Heat treatment modifies the mechanical properties of metal to enhance its hardness, strength, or ductility.

• Tumbled

  This batch-based process uses vibrating media to smooth sharp edges and burrs on CNC parts. Tumbling can also eliminate machine marks on exterior surfaces. Parts larger than 8 inches may require manual inspection.

• Titanium Anodize

  A surface finish for titanium according to AMS-2488 Type 2 specification, also known as Tiodize, enhances fatigue strength and wear resistance. Titanium anodized parts are widely used in aerospace and medical device manufacturing. Non-pigmented titanium anodize finishes may appear dull.

• PTFE Impregnated Hard Anodize

  This hard coat anodizing process incorporates PTFE to produce a self-lubricating, dry contact surface while retaining the protective properties of a Type 3 hard coat. Suitable for aluminum alloys or titanium, this finish extends the service life of the product. It conforms to the AMS-2482 Type 1 Hard Coat Anodizing with Teflon (Non-Dyed) specification.

• Chem Film (Chromate Conversion Coating)

  This coating offers corrosion resistance and good conductivity. It can serve as a base for paint and may leave a yellow or gold surface. The thickness added is minimal, ranging from 0.00001 to 0.00004 inches. The chemical film conforms to MIL-DTL-5541, TYPE I/II standards.

• Electroless Nickel Plating

  This process provides a uniform nickel coating that protects against corrosion, oxidation, and wear on irregular surfaces. The finished part has a brighter appearance, with a thickness starting at 0.0001 inches. It conforms to MIL-C-26074 standards.

• Silver Plating

  Silver provides excellent solderability and electrical conductivity, though it is prone to tarnishing. It conforms to AMS QQ-S-365D standards, with a thickness ranging from 0.00002 to 0.0003 inches.

• Gold Plating

  Gold plating offers strong corrosion and tarnish resistance along with excellent solderability. The standard application specifications are MIL-G-45204 and ASTM B488, CLASS 00, 0, or 1. The thickness typically ranges from 0.00002 to 0.00005 inches.

• Zinc Plating

  This process delivers a uniform zinc coating that protects against corrosion, oxidation, and wear on irregular surfaces. It conforms to ASTM B633-15 standards.

Process flow of CNC machining parts

FAQs

• What is CNC machining?

  CNC machining, or Computer Numerical Control machining, is a manufacturing process that uses computerized controls and precise programming to direct machining tools. It employs computer-aided design (CAD) software to create a digital model of the desired part or component, which is then converted into machine-readable instructions.

• How does CNC machining work?

  CNC machining involves several steps, including computer programming, precise tool movements, and material removal. Here’s a general overview of the process:

   

  1. Design: Create a digital model using CAD software.

  2. Programming: Convert the design into machine-readable instructions.

  3. Set-Up: Prepare the machine and tools for operation.

  4. Execution: Carry out the machining process according to the program.

  5. Monitoring and Adjustments: Oversee the process and make necessary adjustments.

  6. Finishing and Quality Control: Complete the part and ensure it meets quality standards.

• What are the benefits of CNC machining?

  The subtractive process of CNC machining offers numerous advantages for both prototyping and production. Key benefits include precision and repeatability, tight tolerances, lower piece prices at higher quantities, and the ability to deliver quick-turn parts within one day.

• What are your tolerances for machined parts?

  We can achieve a machining tolerance of +/-0.0002 in (0.005 mm). We recommend that part features be thicker than 0.020 in (0.51 mm) in all areas, with a nominal part thickness above 0.040 in. Walls thinner than 0.020 in (0.5 mm) generally do not withstand the machining process.

• Which industries use CNC machining?

  CNC machining is extensively utilized across various industries. It’s prevalent in 3C electronics, aerospace, automotive, medical, robotics, agriculture and mechanical equipment that often incorporate metal parts. Additionally, it’s widely used in medical devices, household goods, energy, oil and gas, and other consumer applications. Overall, CNC machining is one of the most common manufacturing processes globally.

• How do you ensure the quality of my parts?

  –Once your order is confirmed, we conduct a comprehensive Design for Manufacturing (DFM) review to identify any potential issues that could impact quality.

  –All incoming materials are inspected and verified using a range of testing equipment.

  –Final inspection reports are provided before shipment.

  –We can share inspection data with you in real-time, allowing us to collaboratively address any quality concerns during production.

• How much does your CNC machining service cost?

  The average cost for CNC machining on a 3-axis machine is approximately $40 per hour. Operator salaries for CNC milling machines typically range from $30 to $50 per hour. As a result, the total cost for CNC services in this scenario would be around $80 per hour. Keep in mind that higher quality and more advanced CNC machines may incur additional costs.

• Can CNC machining be used for both prototyping and production?

  Yes, CNC machining is suitable for both prototyping and production. It provides a cost-effective and efficient way to create prototypes of parts and components. Additionally, CNC machining is frequently employed for production runs. Once the design and prototype are finalized, CNC machines can be programmed to manufacture the required quantity of parts with consistent precision and quality.

• How do you select a CNC machining manufacturer for my parts?

  Choosing the right manufacturer for your parts requires careful consideration of several factors to ensure they meet your specific needs and deliver the desired quality. As a leading CNC machining manufacturer of high-precision parts, we adhere to the principles of precision manufacturing technology. We have evolved into a large-scale enterprise that offers a comprehensive range of services related to precision parts, spanning from production to sales.

• What is the difference between 3-axis and 5-axis machining?

  The main difference between 3-axis and 5-axis CNC machining lies in the movement and orientation of the cutting tool. A 3-axis CNC machine can move the cutting tool along the X, Y, and Z axes. In contrast, a 5-axis machine can move the cutting tool along the X, Y, Z, A, and B axes, allowing for more complex shapes and precision.

• What are the applications of CNC machining?

  CNC machining is utilized across various industries, including:

  Automotive and Aerospace: It is used to produce precise engine components, structural parts, and other intricate elements.
  Medical: The industry employs CNC for manufacturing devices, implants, and surgical instruments.
  Electronics: CNC machining plays a crucial role in producing electronic housings, circuit boards, and connectors.
  Machine Tool Manufacturing: It is essential for creating complex molds, dies, and machine components.
  Custom Part Production: CNC is also valuable for prototyping, woodworking, and other applications, ensuring consistent quality and high precision.

• What are the advantages and disadvantages of CNC machining?

  Advantages of CNC Machining

  Precision and Repeatability: CNC machining delivers high precision and consistent replication of parts, which is essential for complex designs with tight tolerances.

  Reduced human error: The automated nature of CNC machining minimizes human error and improves overall production quality.

  Efficiency and speed: Automation can speed up production cycles, resulting in faster turnaround times compared to manual processes.

  Material flexibility: CNC machines can use a wide range of materials, including metals, plastics, and composites, providing versatility for a variety of applications.

  Software Integration: Advanced CNC software allows for quick design changes and updates, supporting rapid prototyping and easy customization.

  Cost-effective for high-volume production: Although the initial setup costs may be higher, the unit cost decreases significantly as the production volume increases, making it economical for mass production.

  Disadvantages of CNC Machining

  High Initial Costs: CNC machinery and its maintenance require a large investments, resulting in high initial setup costs, particularly for small-scale operations.

  Skill requirements: Highly skilled personnel are required to operate CNC machines, which increases training costs and limits accessibility.

  Less Cost-Effective for Small Runs: CNC machining may not be economical for producing small quantities of parts due to the setup and programming time involved.

  Material Waste: CNC machining typically involves subtractive processes, which result in more material waste compared to additive manufacturing methods.

  Limited to Material Hardness: Extremely hard materials will cause rapid wear on CNC tools, potentially leading to increased operational costs and downtime.

• What is the difference between 3D printing and CNC machining?

  Manufacturing Process: 3D printing is an additive manufacturing process that constructs parts layer by layer using materials such as plastic or metal. In contrast, CNC machining is subtractive manufacturing, shaping the final product by cutting away material from a solid block.

  Material Efficiency: 3D printing reduces waste by utilizing only the material necessary to create the part, while CNC machining tends to produce more waste due to its subtractive nature.

  Speed and Cost: 3D printing is faster and less expensive for small batches and complex geometries. CNC machining is a better choice for high-volume production and materials that require high precision and strength.

  Surface Finish and Tolerances: CNC machining generally provides superior surface finishes and tighter tolerances compared to 3D printing.

• Who is the father of CNC machining?

  John T. Parsons is often recognized as the father of CNC machining. In the late 1940s, he pioneered the first numerical control techniques and applied them to the production of helicopter rotor blades. Collaborating with engineer Frank L. Stulen, Parsons conceived a method of using punched tape to guide machine tools. This innovation laid the foundation for the development of CNC (Computer Numerical Control) technology. Their groundbreaking work ultimately led to the creation of the first CNC machines in the 1950s, transforming manufacturing by enhancing the precision, efficiency, and repeatability of machining processes.

• What is the G and M code in CNC machines?

  G and M codes are the programming languages used to control CNC machine tools. G-codes primarily dictate the machine’s movements, such as linear interpolation, circular motions, and other functions related to the tool’s path. In contrast, M-codes manage machine operations that aren’t directly linked to the tool’s movement, such as turning the machine on or off, starting or stopping the spindle, and regulating coolant. Together, G and M codes offer a complete set of instructions, enabling CNC machines to produce parts with precision and efficiency.

• What tolerances can CNC machining achieve?

  CNC machining is well-known for its ability to achieve high precision and tight tolerances, which are crucial for creating complex and detailed parts. Standard CNC machining typically maintains tolerances within ±0.01 inches (±0.127 mm), with our factory defaulting to these standardized tolerances unless otherwise specified. For even stricter requirements, advanced CNC machines can achieve tolerances as tight as ±0.0005 inches (±0.0127 mm) under optimal conditions. The achievable tolerance is influenced by various factors, including material, part geometry, size, and the specific type of CNC machine utilized. This capability makes CNC machining a preferred choice for industries demanding highly accurate components, such as aerospace, medical, and automotive sectors.

• What is machining center and how does it work?

  A machining center is a sophisticated CNC machine designed to perform various tasks, including milling, drilling, and tapping, all in a single setup. This integration improves efficiency and accuracy by minimizing the need to transfer parts between different machines. Machining centers feature a tool turret or magazine that accommodates multiple tools, allowing for automatic tool changes under CNC control. This functionality enables quick transitions between operations, optimizing production flow. Typically used for complex parts that require precision machining from multiple angles, machining centers are essential in modern manufacturing environments.

• How much does your CNC machining service cost?

  The cost of our CNC machining service varies based on the specific characteristics of your project, such as design and tolerance requirements. The machining time for the selected material is also a significant factor in determining the overall expense. For example, if the combined machining and material cost for a part is $2, along with a setup fee of $200, the total cost for a single part would be $202. However, if you order 200 identical parts, the cost per unit would drop to just $3!

• Is there a minimum order quantity (MOQ) for CNC machining in your factory?

  We recognize the varied needs of our customers, from single prototypes to large-scale production runs. As a result, we do not impose a strict minimum order quantity (MOQ). Whether you need just one machined part or thousands, we are prepared to deliver customized solutions that cater to your specific requirements. Our flexible approach guarantees that all clients, regardless of order size, receive the highest level of service and quality.

• How long does it take to receive the part once an order is placed?

  The lead time for receiving a CNC machined part from our factory can vary based on several factors, including the complexity of the design, the chosen material, and our current production schedule. CNC machining is renowned for its speed, especially for simpler parts, enabling quick turnaround times. In fact, parts can be delivered as soon as one day after the machining setup is complete! However, in order to get the most accurate time estimate tailored to your specific project, we recommend that you contact us directly for a detailed quote. This allows us to provide you with a precise timeframe based on your unique requirements.

• How does CNC machining differ from traditional machining?

  In traditional machining, a skilled machinist operates a machine to remove or shape metal based on specifications provided by designers and engineers, typically through engineering drawings or blueprints. They utilize turn wheels, dials, switches, chucks, vices, and a range of cutting tools made from hardened steel, carbide, and industrial diamond. Measurement instruments are then employed to ensure all dimensions are accurate.

  CNC machining serves the same purposes as traditional machining—cutting, drilling, milling, boring, grinding, and other metal forming and removal processes—but utilizes computer numerical control instead of manual operation by a machinist. This automated process is driven by code created by programmers, ensuring consistent precision from the first cut to the 500th. Widely used in digital manufacturing and occasionally for low-volume production runs, CNC machining can be easily revised and adapted for modifications and different materials.

  This method of machining is significantly more precise than traditional techniques and has largely replaced them in many manufacturing, fabrication, and industrial production settings, though not completely. It relies on mathematical coordinates and computer processing to achieve highly accurate results. In particular, computer numerical control (CNC) uses Cartesian coordinates—spatial references defined across multiple dimensions using coordinate axes. The automation of machine tools, such as cutters, drills, and borers, is managed through computer-directed numerical instructions that correspond to these coordinates. Engineers initially define these coordinates in the product’s digital design and drawings, enabling the computer to guide the machines with exceptional precision.

CNC Machining Resources