CNC MACHINING PART
CNC machining is a manufacturing process that uses computer-controlled machines to create precise parts and components from a variety of materials, including metals, plastics, and composites. The process involves the use of a CNC (Computer Numerical Control) machine, which is programmed to follow specific instructions to cut, shape, and finish a Metal Part.
Here are the key steps in a typical CNC machining service:
Design & CAD Modeling: The process starts with designing the part using CAD (Computer-Aided Design) software. This model provides the blueprint for the part's dimensions, shape, and features.
CAM Programming: After the design is finalized, CAM (Computer-Aided Manufacturing) software is used to convert the CAD file into machine instructions. This code is usually in G-code, which directs the CNC machine on how to cut the material.
Material Selection: The material to be used for the part is chosen based on the design requirements, such as strength, durability, weight, and finish. Common materials include metals like aluminum, steel, and titanium, and plastics like nylon and ABS.
Machining Process: The CNC machine performs the machining operations like milling, turning, drilling, or grinding, depending on the type of part. The machine tool automatically moves along different axes (usually 3 to 5), removing material in precise patterns to create the desired shape.
Inspection & Quality Control: After the part is produced, it's carefully inspected for any dimensional or structural issues. This ensures that it meets the specifications in the CAD model.
Finishing & Post-Processing: Depending on the needs, parts may undergo additional processes like surface finishing, heat treatment, anodizing, or painting to achieve the desired surface quality and performance characteristics.
The materials we can process are Material: Aluminum,stainless steel,titanium ,barss,Copper,plastic,Alloy |
• Precision Tolerance: ±0.01mm-±0.05mm |
• Surface finish: Anodized,polished,or powder-coated,platingm ,sandblasting |
• Production volume: Low to medium volume,prototype,and batch production |
• Machining process: Milling,turning,drilling,tapping and sheet metal fabrication Stamping die-casting,Multistep machining |
• Processing Method: Custom according to provided CAD drawings |
• Lead time: Short lead time,typically 1-4 weeks |
• Quality control: Strict quality assurance and inspection processes |
• Packaging: Secure packaging to prevent damage during transit |
• Compliance: ISO 9001 certified |
• Ability to provide samples before mass production |
We look forward to receiving your customized requirements and establishing a fruitful partnership. |
Available Material
|
Aluminum
|
AL6061, AL6063, AL6082, AL7075, AL5052, A380, etc
|
Brass
|
HPb63, HPb62, HPb61, HPb59, H59,H68, H80, H90, etc
|
Copper
|
C11000, C12000, C22000, C26000, C28000, C36000
|
Stainless Steel
|
303, 304, 304L, 316, 316L, 410, 420, 430, etc
|
Steel
|
Mild Steel, Carbon Steel, 1018, 1035, 1045, 4140, 4340, 8620, XC38, XC48, E52100, Q235, SKD11, 35MF6Pb, 1214, 1215, etc
|
Titanium Alloy
|
TC1, TC2, TC3,TC4, etc
|
Iron
|
A36,45#, 1213, etc
|
CNC machining is often followed by a variety of surface treatments to improve the performance, appearance, and durability of metal parts. These treatments can enhance qualities like corrosion resistance, hardness, wear resistance, and aesthetic appeal.
Metal Surface Treatments:Anodizing,Electroplating,Powder Coating,Heat Treatment,Oxide Coating,Chromate Conversion Coating,Galvanizing,Polishing,Electropolishing,Passivation,Bead blasting,Sputtering.
Aic Size Range |
Fine |
Medium |
Coarse |
Very Coarse |
0.5 up to 3 |
0.05 |
± 0.1 |
± 0.2 |
- |
over 3 up to 6 |
± 0.05 |
± 0.1 |
± 0.3 |
± 0.5 |
over 6 up to 30 |
± 0.1 |
± 0.2 |
± 0.5 |
± 1 |
over 30 up to 120 |
± 0.15 |
± 0.3 |
± 0.8 |
± 1.5 |
over 120 up to 400 |
± 0.2 |
± 0.5 |
± 1.2 |
± 2.5 |
over 400 up to 1000 |
± 0.3 |
± 0.8 |
± 2 |
± 4 |
over 1000 up to2000 |
± 0.5 |
± 1.2 |
± 3 |
± 6 |
over 2000 up to4000 |
- |
± 2 |
± 4 |
± 8 |
CNC Machining Tolerance Control refers to the ability to precisely Control the dimensions and geometric features of a machined part, ensuring that it meets the required specifications.
Types of Tolerances:
Linear Tolerances: Applied to the length, width, height, or diameter of a part. For example, a shaft may need to be 10 mm ±0.01 mm.
Geometric Tolerances: These Control the shape, orientation, location, and runout of a feature. Common geometric tolerances include flatness, perpendicularity, concentricity, and circularity.
Angular Tolerances: These define the allowable deviation of angles.
Surface Finish Tolerances: The smoothness of a surface, which is critical in certain applications like seals or sliding surfaces. This is measured in roughness (Ra), which Controls the surface texture.
Factors Affecting Tolerance Control:
Machine Precision: The accuracy of the CNC machine itself, including its ability to repeat movements and cut with minimal error.
Tool Wear: As tools wear out, they can deviate from their original cutting performance, leading to dimensional inconsistencies.
Material Properties: The material being machined can influence tolerances. For example, materials with more ductility or flexibility (like aluminum) may experience more thermal expansion or deformation than harder materials like steel.
Part Setup and Fixturing: Proper part placement and secure fixturing are vital for maintaining tolerance. Any movement during Machining can lead to deviations.
Environmental Conditions: Temperature fluctuations can cause parts or machines to expand or contract, influencing dimensional accuracy.
Cutting Parameters: Factors like feed rate, spindle speed, cutting depth, and tool path strategy affect the precision and finish of the part.
Methods for Achieving Tight Tolerances:
High-Precision Machines: Using machines with higher precision and more advanced Control systems (like 5-axis CNC machines) can help achieve tight tolerances.
Compensation for Tool Wear: CNC machines can be programmed to account for tool wear and automatically adjust during the Machining process.
In-Process Measurement and Feedback: Some advanced CNC machines use probes or sensors to measure the part during Machining, making adjustments in real time to correct for any deviations.
Post-Processing Measurement: After Machining, precision measurement tools like coordinate measuring machines (CMM) or laser scanners can verify the dimensions of the part.
Material Selection: Choosing materials with stable properties and low variability helps in maintaining consistent tolerances.



Shenzhen Wanda-an Precision Technology Co.,ltd is an ambitious ISO9001 ISO14001 registered company, specialized in CNC services and focusing on superior workmanship, high quality, cleanliness and on-time lead time. We're a firm-united team of talented and experienced engineers, machinists and technical consultants, who commit to help solve problems in precision and complex machined parts, including design, cost, quality, assembly problems.
When receiving customers' first inquiry, we study their design at first, treating them as our own projects, and suggest the best processing method to bring them to life. We always provide good customer service and support customer launch new products on Medical, Aerospace, Automotive, and Consumer Electronic market soonest possible. We do our best to provide high quality and competitive price with best service.





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