How to Choose the Right CNC Machining Method?

As manufacturing technology advances, CNC machining has become the core technology of the modern machining industry. Depending on the number of axes that can be operated, CNC machining machines are usually categorized into 3-axis, 4-axis, and 5-axis. CNC machines with different numbers of axes have significant differences in functionality, application scenarios, and machining efficiency.

What are “Axes” in CNC Machining?

In CNC machining, “Axes” are the directions or degrees of freedom in which a tool or workpiece can move or rotate. The greater the number of axes, the greater the freedom of machining and the greater the ability to machine complex parts.

• 3 Axis: The tool can move in the X, Y, and Z directions.
• 4 Axis: A-axis (rotating around X-axis) is added to 3-axis.
• 5 Axis: Two rotary axes (A and C or B and C) are added to the 3-axis.

3-axis CNC Machining

Features:

• The tool moves in a straight line along the X, Y, and Z axes and is suitable for machining flat surfaces and simple geometries.
• Relatively simple to operate and less difficult to program.

Applicable Scenarios:

• Mold Manufacturing: This method is suitable for manufacturing molds with simple structures, such as the flat mold cavity of injection molds.
• Product Parts: Machining flat or regular curved surfaces, such as housing parts or brackets.

Advantages:

• Affordable and fast processing speed.
• Suitable for mass production, with low requirements for programming and equipment operation.

Disadvantages:

• Can’t help with complex geometries such as parts with multiple or curved surfaces.
• Lower machining efficiency requires frequent manual adjustment of the workpiece angle.

4 Axis CNC Machining

Features:

Adds the A-axis (rotation around the X-axis) to the 3-axis base, allowing the workpiece to be rotated for multiple face machining.

Applicable Scenarios:

• Cylindrical Parts Machining: e.g. thread machining, multi-face milling of shaft parts.
• Surface machining: machining of complex surfaces and curved parts.

Advantages:

• Can complete the machining of multiple surfaces in one clamping, reducing the number of clamping times and improving accuracy.
• More efficient machining of non-planar features.

Disadvantages:

• More expensive and slightly more complex to program than 3-axis equipment.
• Still has limitations in machining very complex geometries.

5-axis CNC Machining

Features:

Adds two rotary axes (A-axis and C-axis or B-axis and C-axis) to the 3-axis, and the tool can contact the workpiece from multiple angles for all-around machining.

Applicable Scenarios:

• Aerospace: Machining turbine blades, engine parts, and other complex parts.
• Medical Devices: Processing precision parts such as artificial joints and orthopedic implants.
• High-end Molds: Manufacturing of complex curved surface molds and multi-angle cavity molds.

Advantages:

• Complex parts can be processed in one clamping, with high precision and efficiency.
• can machine complex surfaces, multi-angle holes, and other difficult features.
• Reduces manual intervention and improves machining stability and consistency.

Disadvantages:

• Costly, including equipment investment and programming maintenance costs.
• Requires high operator and programmer skills.

How to Choose the Right CNC Machining Method?

Choosing a 3-axis, 4-axis or 5-axis CNC machining machine depends mainly on the following factors:

1. Part Geometry: 3-axis for simple planar surfaces, 4-axis for multi-face machining, and 5-axis for complex surfaces.
2. Production Requirements: 3-axis for mass-produced standardized parts, 4-axis or 5-axis for customized, high-precision parts.
3. Budget Considerations: Startups or small and medium-sized production can start with 3-axis or 4-axis, while high-end manufacturing recommends 5-axis equipment.

3-axis, 4-axis and 5-axis CNC machining have their own advantages and disadvantages:

• 3 Axis: Economical and practical, suitable for basic machining.
• 4 Axis: More flexible, suitable for multi-face and simple surface machining.
• 5 Axis: Unrivaled precision and efficiency, the first choice for machining complex geometries.

If you have any customized parts or mold projects that you need, please feel free to contact our team!