As we all know, in the CNC machining industry, 3-axis CNC machining and 5-axis CNC machining are the most common machining methods. However, there are many differences between the two processes. This article will explain the differences in their characteristics, machining methods, etc. If you are in need of CNC machining services now, but are not sure which machining method to choose, I believe you will have the answer after reading this article.
What is 3 Axis CNC Machining?
3-axis CNC machining is the most basic CNC machining method.Its principle is that the tool moves around the three linear directions of the X-axis, Y-axis and Z-axis, and cuts the workpiece fixed on the machine tool, thereby gradually forming the final part.
- X-axis: move left and right (horizontal)
- Y-axis: forward and backward movement (deep movement)
- Z-axis: up and down (vertical movement)
What is 5 Axis CNC Machining?
5-axis CNC machining adds 2 rotation axes to the 3-axis: A-axis and B-axis. This process enables high-precision machining without the need to reposition the workpiece. The tool can contact the workpiece from multiple angles and cut at any angle, thereby machining parts with complex curved surfaces and multi-angle requirements in one time.
- A-axis: rotates around the X axis (usually rotation of the table)
- B-axis: rotates around the Y axis (usually rotation of the tool head or table)
Differences Between 3 Axis CNC Machining And 5 Axis CNC Machining
Both machining processes are very popular and can produce high-precision, high-quality products for a wide range of customers. Which method you choose to use depends on many factors. Next, I will introduce these factors to you in detail to make it simple for you.
1. Working Principle
First of all, as you can see from the above description, the most significant difference is the working principle. 3-axis CNC machining has only three axes. The tool can only move and cut along three fixed directions, and the workpiece itself is stationary. The 5-axis CNC machining has two more rotation axes, so that the tool can machine the workpiece from multiple angles.
2. Machine Setup
Relatively speaking, the setup of a 3-axis machine tool is relatively simple. You only need to fix the workpiece and set the path planning of the tool in the X, Y, and Z directions. The basic G code and M code can complete 3-axis machining. But it should be noted that when machining complex parts, you need to adjust the position of the workpiece many times, which will lead to errors.
On the other hand, the setup of a 5-axis machine is much more complicated. Since the tool needs to contact the workpiece from multiple directions, you need to consider the range of motion and limitation of the rotary axis, the length of the tool, etc., to ensure that the machining path is consistent with the actual position of the workpiece. In addition, in terms of workpiece clamping, you only need to do it once, and the overall machining efficiency is higher.
3. Efficiency
3-axis CNC machining is very efficient when producing simple parts, but when faced with complex parts, the overall efficiency is reduced because the operator needs to clamp and change the position of the workpiece many times. The efficiency of 5-axis CNC machining is significantly higher than that of 3-axis CNC machining, because this process completes the processing of parts with complex structures at one time, especially high-precision and high-quality parts.
4. Professional Requirements
The two processes have different professional requirements for operators. 3-axis CNC machining only requires the operator to have basic machine tool knowledge and know how to set the calibration of the tool and the path of the three axes. However, 5-axis CNC machining puts forward many requirements. Operators must not only master the operation of multi-axis machine tools, but also clearly master the calibration of rotating axes and the clamping technology of complex workpieces. In addition, operators must have advanced programming skills and be proficient in using high-end CAM software.
5. Cost
The price of 3-axis CNC machining machine tools is relatively low, and the price of new machines is generally between 10,000 and 150,000 US dollars. Because the structure of the machine tool is simple, it is also very convenient to maintain and the cost is very low. In contrast, the price of a 5-axis CNC machining machine tool is very expensive, generally the price of a new machine is between 200,000 and 1.5 million US dollars. In addition, due to the complex structure of 5-axis machine tools, the maintenance costs are also high. At the same time, you also need to purchase expensive high-end CAM software.
6. Surface Quality
Due to the limitation of the tool path, 3-axis CNC machining will result in poor surface finish of the parts, leaving tool marks, with a minimum roughness of 1.6µm. 5-axis CNC machining can achieve multi-directional cutting, so it can significantly improve the surface finish of complex curved surfaces, and its Ra value can reach 0.4µm.
7. Application Areas
3-axis CNC machining is mainly used to process simple metal components, molds, mechanical parts, etc. These components do not require high accuracy and have simple structures. 5-axis CNC machining is suitable for fields that have extremely high requirements on the accuracy, efficiency, and complexity of parts, such as aerospace, automotive industry, medical equipment, etc.
The following table shows the components that can be produced by 3-axis CNC machining and 5-axis CNC machining in common industries：
| Industry | 3-Axis CNC Machining Applications | 5-Axis CNC Machining Applications |
| Aerospace | -Simple connectors, brackets -Drilling and slotting tasks | -Turbine blades, engine blades -Aircraft structural parts (complex surfaces) |
| Automotive | -Engine housings, transmission housings – Wheels, brake discs | – Automotive lighting molds – Turbocharger components – Complex body structures |
| Medical Devices | -Simple medical equipment housings -Drilling and cutting surgical tools | -Artificial joints, orthopedic implants -Dental restorations |
| Mold Making | -Flat surfaces F5of injection molds -Stamping dies, simple cavity molds | – Injection molds with complex surfaces – Die casting molds |
| Energy | – Basic wind turbine components (e.g., flanges, brackets) – Regular oil drilling equipment parts | – Wind turbine blade molds – Complex nuclear power components |
| Consumer Electronics | – Smartphone housings, laptop bases – Drilling, slotting | – Complexly designed smartphone molds – High-precision molds |
In Conclusion
The above is the difference between 3-axis CNC machining and 5-axis CNC machining, I believe you must have a general understanding after reading it. And if you already have a budget and parts drawings, but don’t know which machining method to choose. Don’t worry, you can send us an inquiry and we can solve the problem for you. DSR is an experienced company, and our professional team will develop a reasonable CNC machining solution according to your project, and can even optimize the project cost for you. Our goal is to ensure that all our customers can obtain high-quality and cost-effective parts. Contact us now!
