Investing in a small CNC machine can be a game-changer for hobbyists, small businesses, and professionals alike. These versatile machines offer precision and automation for a wide range of applications, from woodworking to metalworking and beyond.
Choosing a suitable small CNC machine tool based on your needs requires following a series of detailed steps and considering multiple key factors. Here is a comprehensive guide to help you make wise decisions:
一、CNC System Selection
When selecting a small CNC machine tool, the machine itself is undoubtedly important, but the choice of the numerical control (NC) system is equally crucial. This is because different NC systems vary significantly in performance, directly affecting equipment prices. Currently, the market offers numerous NC system brands and specifications, among which imported systems like Japan’s FANUC, Germany’s SINUMERIK, Japan’s MITSUBISHI, France’s NUM, Spain’s FAGOR, and America’s A-B have gained widespread recognition for their outstanding performance and stability.
Several basic principles should be followed when choosing an NC system. Firstly, cost-effectiveness is a significant consideration. Rather than solely pursuing high-level or new systems, a comprehensive analysis of system performance and pricing in conjunction with the mainframe’s performance requirements should be conducted to select the most suitable system. Secondly, the ease of maintenance should not be overlooked. An easy-to-operate and maintain system can greatly reduce downtime, maintenance costs, and the labor costs of CNC machine operators. Lastly, the market lifespan of the system is also a factor to consider. Choosing a system with a long market lifespan means that we can obtain longer technical support and system updates.
Additionally, we should gradually reduce the selection of traditional closed architecture or PC-embedded NC structure NC systems. The expansion, modification, and maintenance of these systems typically depend on the system vendor, limiting our autonomy and flexibility to a certain extent. On the contrary, open NC systems, such as NC-embedded PC structure or SOFT structure, provide us with more choices and possibilities. All CNC software of these systems is installed on the computer, and the hardware part is just a standardized general interface between the computer and servo drives and external I/O. This structure allows us to develop the required functions on the WINDOWS NT platform as needed, just like installing sound cards, graphics cards, and drivers on a computer, thereby constructing various types of NC systems.
In addition to basic functions, many NC systems also offer additional functional options such as workpiece processing, measurement, and program compilation. We can select these additional functions in the purchase contract based on our actual needs, especially real-time transmission functions like DNC, to improve the machining efficiency and accuracy of the machine tool.
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Selection of Machining Accuracy and Complexity
The evaluation focus of small CNC machine tools lies in positional accuracy, repeatability, and coordinated machining capability, all of which directly impact the machine’s machining capability and stability.
Positional accuracy refers to the error range when the machine positions at any point within its travel. Repeatability reflects the machine’s stability during consecutive positioning and forms the basis for judging its reliability.
Despite the rich error compensation features provided by CNC systems, such as pitch compensation and backlash compensation, random errors cannot be completely eliminated through electronic control. These errors are influenced by factors like workload, travel distance, and positioning speed, especially in open-loop and semi-closed-loop feed servo systems.
For machines requiring high positional accuracy, special attention should be paid to the type of feed servo system and the accuracy and stability of detection components. Machines using semi-closed-loop servo drive may be affected by external factors such as elongation of ball screws, thereby impacting machining accuracy.
When selecting small CNC machine tools, it’s crucial to consider positional accuracy, repeatability, and coordinated machining capability, as well as the performance of feed servo systems and detection components, to ensure the machine meets the requirements for machining accuracy and complexity.
三、Main Feature Specification Selection
When selecting a small CNC machine tool, consider the typical dimensions of the workpiece. Assuming our typical workpiece size is 300mm × 250mm × 150mm, it’s essential to ensure that the worktable size can accommodate the workpiece with enough space for fixture installation and operation. Therefore, opting for a machine with a worktable size of 400mm × 350mm would be suitable. This size not only meets the current machining requirements but also allows for some room for expansion.
Pay attention to the travel ranges of the three basic linear coordinates (X, Y, Z). For the aforementioned workpiece size, the X-axis travel could be chosen as 450mm, the Y-axis travel as 350mm, and the Z-axis travel as 200mm. These travel ranges ensure sufficient movement space for the workpiece during machining to perform complex operations.
For small CNC machine tools, the spindle motor power typically ranges from 3kW to 5kW. Depending on the workpiece material and machining requirements, choose an appropriate power configuration. If high-intensity cutting or machining of hard materials is needed, opt for a spindle motor with higher power to ensure stability and efficiency during the machining process. Through proper selection, the machine tool can meet specific machining needs, thereby enhancing machining efficiency and quality.
Small CNC Machine Tool Manufacturer:
There are many manufacturers of small CNC machine tools, and the following are some recognized brands:
- DMG Mori
- Makino
- Okuma
- HAAS Automation
Conclusion
By prioritizing these factors and conducting thorough research, you can choose a small CNC machine that empowers you to achieve optimal performance, efficiency, and precision in your machining tasks.
Your budget is limited? Or do you only need precision machining for a small batch of parts? BoYi is your reliable partner. Our CNC machining services are committed to providing you with high-quality, high-precision custom machining solutions, helping you stand out in the industry. Contact our team now to learn more about our services and how to start collaborating.
