Classification of CNC machines

Understanding the classification of CNC machines is essential for any workshop looking to optimize its processes and maximize profitability. Choosing the right machinery is not just a technical decision but a strategic investment that defines production capacity, part accuracy and market competitiveness. An informed choice will allow you to acquire the technology you really need, avoiding unnecessary spending on features you will not use or, conversely, falling short on capabilities that could open up new business opportunities. As your competitive partner, at Vurcon we help you navigate these options to find the solution with the best value for money.

How are CNC machines classified?

Computer Numerical Control machines can be organized into different categories according to specific criteria. There is no single way to classify them, as each criterion answers a different question about the machine: what does it do? how does it move? how reliable is its electronic brain? and what technology does it use to shape the material? The most important classifications for an industry professional are based on the type of operation they perform, their kinematic complexity (number of axes), the control system they use and their level of automation.

Classification by type of operation

This is the most fundamental criterion and divides machines according to the nature of their work on the part, whether removing, adding or forming material.

Chip-removal machines

These are the most common in machining, and their function is to remove material from a raw block to shape it. Precision and efficiency in this process are key to profitability.

• CNC lathes: The workpiece rotates at high speed while the stationary tool shapes it. They are essential for axially symmetrical components such as shafts, bushings or bolts.

• Machining centers or CNC milling machines: The tool rotates and moves to remove chips while the workpiece remains fixed. Vurcon machining centers, thanks to their cast-iron construction, ensure high rigidity that minimizes vibration. For you, this translates directly into tangible benefits: a better surface finish that reduces or eliminates manual polishing, a longer service life for your cutting tools and the ability to perform more aggressive roughing to shorten cycle times.

Surface finishing and forming machines

This equipment focuses on the final stage of production or on processes that do not involve chip removal.

• CNC grinding machines: Their purpose is not to create the main shape but to improve surface quality and achieve very tight dimensional tolerances using an abrasive wheel.

• CNC presses and press brakes: They do not remove material but deform it plastically to shape it, and are essential in the sheet metal industry.

Additive manufacturing

Popularly known as 3D printing, this technology works in the opposite way to chip removal. Instead of removing material, it adds it layer by layer to build the part from scratch, enabling geometries that are impossible with traditional methods.

Classification by number of axes

The number of axes determines the machine's freedom of movement and, therefore, the complexity of the parts it can produce in a single setup. More axes mean fewer manual interventions, greater precision and shorter cycle times.

• 2- and 3-axis machines: These are the industry standard. A basic lathe operates on 2 axes (X, Z). A 3-axis vertical machining center (X, Y, Z) can produce a wide variety of parts, but it can only approach the workpiece from one direction, requiring the operator to turn it manually to machine other faces.

• 4-axis machines: They add a rotary axis (A axis) to the 3-axis configuration. This makes it possible to machine several faces of a part without unclamping it, a major leap in efficiency.

• 5-axis machines: They represent the most advanced technology, with three linear axes and two rotary axes. They allow the tool to approach the workpiece from any angle, making it possible to produce extremely complex geometries in a single clamping.

Connecting axes with profitability

The decision to invest in more axes should be based on return on investment. Here are some keys to knowing when to make the leap:

• Consider a 4th axis when more than 30% of your parts require machining on multiple faces. The investment pays off quickly by eliminating idle time and manual positioning errors.

• The move to 5 axes is justified if you can eliminate two or more setups per complex part. This not only drastically cuts setup time but also opens the door to geometries that were previously impossible or unprofitable to produce.

Practical example: A customer in the industrial maintenance sector cut the manufacturing time for a complex spare part from 4 hours (on 3 axes, with 3 different setups) to just 1.5 hours on a 4-axis Vurcon machining center, as they could complete 90% of the part in a single operation.

Classification by control system

If the mechanical structure is the body of the machine, the control system is its brain. Its architecture defines the reliability and precision with which movements are executed, making it a key quality differentiator.

• Open-loop systems: The controller sends a command to the motor and assumes it has been carried out, without any verification. These systems are cheaper but less precise, as they cannot detect or correct errors such as lost steps, which leads to inaccuracies that are unacceptable in a professional environment.

• Closed-loop systems: They incorporate a feedback system (an encoder) that constantly informs the controller of the actual position of the axis. If there is a deviation, the system corrects it in real time. All precision industrial machines, such as Vurcon lathes and machining centers, use closed-loop systems to guarantee the maximum reliability and repeatability the market demands.

Classification by degree of automation

Although all CNC machines are inherently automatic, their degree of autonomy can vary significantly.

• Standard CNC machines: They require an operator to load and unload parts and supervise the process.

• Flexible manufacturing cells: They integrate elements such as automatic pallet changers (APC) or robotic arms for loading and unloading parts. These systems can run for hours with minimal supervision, dramatically increasing productivity.

• Flexible manufacturing systems (FMS): These are fully automated production lines that connect several CNC machines and storage systems through a central controller.

Which CNC machine is right for my workshop?

Selecting a CNC machine is a strategic investment that must go beyond price. It is not about acquiring the most advanced technology, but the one that offers the best return on investment for your specific applications.

To help you identify your profile, consider these common scenarios:

• If you produce short runs of complex parts (e.g. molds, prototypes): Your priority should be versatility and fewer setups. A 5-axis machining center is the most profitable long-term investment, as it minimizes setups and enables advanced geometries.

• If you produce long runs of simpler parts (e.g. automotive, bar turning): Your priority is cycle time and automation. A lathe with a bar feeder or a horizontal machining center with a pallet changer (APC) will give you maximum productivity and a lower cost per part.

• If your workshop focuses on maintenance or auxiliary production: Your key is flexibility and fast setup. A 3- or 4-axis Vurcon vertical machining center offers excellent value for money and the ability to respond quickly to any unforeseen need.

At Vurcon, we understand these differences. Our approach is based on tailored advice to study which configuration best suits your needs. We not only help you choose the machine with the best value for money, but also offer a comprehensive service covering delivery, commissioning, training and after-sales service with spare parts in stock to guarantee an immediate response.

Ready to take your production to the next level with the right CNC technology? Contact our team of specialists to receive a personalized, no-obligation analysis.