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CNC Machining eBook
If you want to produce high-quality machined parts with a sleek appearance, it’s essential to consider some critical factors related to CNC machining.
Here, we’ve gathered some basic information and important considerations to help you achieve the desired results.
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ur 3-axis CNC milling services are ideal for cost-effective machining of simple geometries.
We deliver consistent accuracy for flat and prismatic parts using advanced CNC milling machines.
4-axis CNC milling allows multi-side machining in a single setup, reducing repositioning errors and improving efficiency.
This service is widely used for custom CNC milling parts with complex side features.
Our 5-axis CNC milling service supports highly complex and precision-critical components.
It is the preferred solution for aerospace, medical, and high-tolerance CNC milling applications.
Rapid Prototyping
Accelerate product development with our rapid CNC machining services. We offer fast turnaround times and specialize in quick production of high-quality prototypes and mold tooling, aiding your design verification process.
Low and High-Volume Production
Whether you need small batches or large-scale production, we can offer you both. With stringent tolerance controls and comprehensive capabilities, we adapt to your volume requirements without compromising on quality.
Gain access to quality surface finishing for custom CNC milled parts to remove aesthetic flaws and improve the appearance of your products. We also provide rigid protection and additional resistance and strength to your parts through superior surface finishes.
CNC milling tolerances define how precisely part dimensions are controlled during machining.
Our precision CNC milling services follow ISO 2768-m for metals and ISO 2768-c for plastics, delivering stable, repeatable dimensional accuracy across 3-axis, 4-axis, and 5-axis CNC milling.
| 3-Axis | 4-Axis | 5-Axis | |
|---|---|---|---|
| Maximum Part Size | 1000 x 500 x 500 mm | 1000 x 500 x 500 mm | 4000×1500×600 mm |
| Minimum Part Size | 5 x 5 x 5 mm | 5 x 5 x 5 mm | 5 x 5 x 5 mm |
| General Tolerances | ±0.1 mm | ±0.1 mm | ±0.05 mm |
| Lead Time | Delivery of simple parts can be as fast as 1 day. | 5 bussiness days for most projects. | 5 bussiness days for most projects. |
| Recommended Size | |
|---|---|
| Radii | Internal radii should be at least 1/3 of the cavity depth. Use larger radii whenever possible. |
| Threads and Tapped Holes | Diameter Φ 1.5-5 mm, depth: 3 times the diameter. Diameter Φ 5 mm or larger, depth: 4-6 times the diameter. RapidDirect can produce threads of any specification and size as required by the customer. |
| Minumum Wall Thickness | For metals: 0.8 mm; For plastics: 1.5 mm. Thicker walls ensure better structural integrity. |
| Text | CNC Milling: Minimum width of 0.5 mm and depth of 0.1 mm. RapidDirect can create standard text via CNC engraving or laser engraving as per customer requirements. |
| Holes | Minimum diameter of 1 mm. Hole depth should not exceed 4 times the diameter for best results. |
Upload your CAD files to our online CNC milling service platform and receive an instant CNC machining quote with lead time and DFM feedback.
Suitable for both prototype and production CNC milling parts.
Our precision CNC milling services with tolerances as tight as ±0.01 mm.
Our advanced CNC milling machines ensure consistent accuracy for custom metal and plastic parts.
As a factory-direct CNC milling service supplier, we reduce lead times without compromising quality.
Simple CNC milled parts can be delivered in as fast as 1 day.
As an experienced CNC milling company, our engineers provide DFM feedback and machining guidance to optimize designs for cuostom CNC milling services, helping reduce cost and improve manufacturability.
Our CNC milling process starts with CAD file analysis and DFM review, followed by precision machining on 3, 4, or 5-axis CNC milling machines.
This streamlined workflow ensures accuracy, repeatability, and efficiency for custom CNC milling parts.
CNC milling offers numerous advantages for manufacturing:
CNC milling is widely used to produce a variety of precision parts and components:
At RapidDirect, we have a variety of CNC milling machines to meet diverse manufacturing needs. Our inventory includes 3-axis, 4-axis, and 5-axis CNC milling machines.
The 3-axis machines are perfect for simple operations, handling basic cutting tasks along the X, Y, and Z axes.
Our 4-axis machines add an extra rotational axis, allowing for more complex geometries and more efficient production of parts with features that require continuous machining around a fourth axis.
Finally, our advanced 5-axis CNC milling machines offer the highest level of precision and versatility, enabling the creation of intricate parts with complex shapes and angles.
These machines are capable of machining in five different axes simultaneously, reducing the need for multiple setups and ensuring exceptional accuracy and quality in every component we produce.
Our CNC milling tolerances depend on machine type, material, and part geometry.
Standard tolerances follow ISO 2768-m (metals) and ISO 2768-c (plastics)
Typical general tolerances: ±0.1 mm
High-precision 5-axis milling can achieve tolerances as tight as ±0.01 mm for critical features
For tighter tolerances, we recommend specifying requirements directly on the drawing so our engineers can optimize tooling, inspection, and cost.
3-axis milling is ideal for simple geometries and flat features
4-axis milling enables machining around multiple sides with fewer setups
5-axis milling is best for complex geometries, tight tolerances, and parts requiring multi-angle machining
Choosing the right axis configuration can significantly reduce lead time and improve accuracy.
Lead times depend on part complexity and machining axis:
Simple 3-axis parts can be delivered in as fast as 1 day
Most CNC milling projects are completed within 5 business days
Expedited options are available for urgent production needs.
CNC milling is ideal for complex geometries, slots, pockets, and contours, while CNC turning is best suited for cylindrical parts such as shafts and bushings.
If your part includes both rotational and prismatic features, combining milling and turning may be the most efficient solution.
CNC milling is a subtractive manufacturing process where material is removed from a solid block using rotating cutting tools controlled by computer programs.
CNC milling is widely used to produce precision parts with complex geometries, tight tolerances, and consistent quality. It supports multi-axis machining (3-axis, 4-axis, and 5-axis), allowing features such as pockets, slots, holes, and complex contours to be machined efficiently.
At RapidDirect, CNC milling is commonly used for functional prototypes, low-volume production, and end-use parts across industries such as automotive, aerospace, and industrial equipment.
