5-Axis CNC Machining is a versatile and advanced manufacturing process used in many industries due to its ability to produce complex geometries and precision parts quickly.

This machining method allows the cutting tool and workpiece to move in five different axes, creating complex geometries with high accuracy and superior surface finishes. In this article, learn how 5-Axis CNC Machining works, as well as its applications, benefits, and limitations.
 

5-Axis CNC Machining is a machining setup where the workpiece and cutting tool can move in 5 axes. In CNC machining, a cutting tool selectively removes portions of a block of material until the desired object is formed. During this process, the machine head and worktable move the cutting tool and workpiece respectively to allow the cutting tool to access different areas of the workpiece. The directions of these movements form the machining axes.

5-axis CNC machining consists of five machining axes, three linear axes and two rotary axes. The linear axes are the X-axis (left-to-right movement), the Y-axis (forward and backward movement), and the Z-axis (up and down movement). Depending on the machine, the two rotary axes are any two of the A-axis (rotation along the X-axis), B-axis (rotation along the Y-axis), and C-axis (rotation along the Z-axis).

For example, one particular 5-axis CNC machine may be capable of moving along the X, Y, Z, A, and B axes, while another may move along the X, Y, Z, B, and C axes. The axes are depicted in the image below.

5-axis CNC machining is a step up from the more common three-axis machining in which the workpiece and cutting tool move along three linear axes. This advanced machining process is faster and more capable than 3- to 4-axis machining. However, it is also more complex, requiring more advanced tool path programming. Additionally, it can be twice the cost of 3-axis milling due to the cost of the machine and the complexity of the process.

 

 

There are many different types of 5-axis CNC machining techniques and machines. These machines can be classified according to the movement time and machining operations. The types of 5-axis CNC machines, under this category, are:
 

Also known as 3+2-axis machining, the main distinguishing feature of indexed 5-axis CNC machining is the discontinuous movement along all five axes. During the machining process, the machine continuously cuts along three linear axes. These movements are part of the cutting operation. On the other hand, two rotational movements serve to reposition the cutting tool or workpiece. The cutting process is temporarily stopped during the rotation.

In short, the cutting process takes place on three linear axes. When necessary, the cutting process stops and the machine repositions the cutting tool or workpiece, rotating it through a specific angle. The cutting process then continues along the three linear axes in the new position. These steps occur rapidly and continue intermittently until the part is formed.

In most indexed 5-axis CNC machine configurations, the machine table provides the rotary motion, usually along the A and C axes, while the cutting head performs the linear motion. Indexed 5-axis machining is less expensive than continuous machining but 65% more expensive than conventional 3-axis milling.
 

 

Similar to indexed CNC machines, continuous 5-axis CNC machines can move in five axes. However, unlike indexed machines, continuous 5-axis CNC machines can move in all five axes without stopping. This means there is no downtime during the cutting process for the machine to reorient the workpiece or cutting tool.

The cutting tool continuously impacts the workpiece as it moves and rotates in all five axes, creating a smooth, uninterrupted workflow. Continuous 5-axis CNC machining is faster and more capable than indexing machining, as it provides easier access to the workpiece and there is no downtime. On the other hand, it is more complex, requiring more sophisticated tool paths. In most continuous 5-axis CNC machines, the spindle provides the rotary motion. The spindle or table can perform linear motion. Continuous 5-axis machining costs twice as much as 3-axis milling.
 

A 5-axis CNC milling turning center combines a lathe and a milling machine. Capable of performing both CNC milling and CNC turning, this hybrid machine produces more complex shapes than the individual machines.

In most 5-axis CNC turning centers, the workpiece mounted on the spindle rotates along the A-axis. At the same time, the milling cutter provides linear motion in the X, Y, and Z axes and rotary motion in the B-axis.

 

5-axis CNC machining is widely used in many different industries due to its ability to create complex and precise parts. This operation is often used in the following areas where extremely complex geometry, precision details, and speed are required:

Overall, 5-axis CNC machining is an indispensable technology in industries that require precision, efficiency, and quality.
 

The ability of 5-axis CNC machining to produce complex part shapes with precision that meets the stringent precision requirements of the aerospace industry. Components such as turbine blades, structural airframe components, and engine components require the precision and quality that 5-axis machining provides. Additionally, the ability to machine complex shapes in a single setup further reduces errors and enhances the reliability and performance of aerospace components.
 

Accuracy is especially important for transmission and engine components in the automotive industry. These components often have complex shapes and are in constant motion relative to each other. 5-axis CNC machining meets the requirements required for these conditions, allowing for complex designs and maintaining tight tolerances. This results in improved performance, efficiency, and customization in vehicle manufacturing.
 

Medical prostheses and implants often have complex shapes that mimic body parts. An additional layer of complexity is added when these prostheses are custom-made to fit each individual patient. Furthermore, high precision, extremely tight tolerances, and quality surface finishes are critical to the function and safety of medical devices, implants, and prostheses. 5-axis CNC machining is one of the few manufacturing processes that meets the stringent standards of the medical industry, making it indispensable in the industry.
 

The energy industry, including the oil and gas, wind and solar industries, benefits from the robustness and precision of 5-axis CNC machining. Components such as turbine blades, pump housings and complex mountings require durability and precision engineering to operate efficiently in harsh conditions. The ability to accurately machine complex parts in a single setup makes 5-axis CNC machining ideal for these applications.
 

5-axis CNC machining provides the precision and capability needed to produce specialized, complex parts that meet the stringent requirements of military applications. The defense industry requires high precision and reliability for components used in weapons systems, vehicles and aircraft, as failures in these components can have catastrophic consequences.
 

The versatility of 5-axis CNC machining makes it invaluable for rapid prototyping and custom manufacturing. Designers and engineers can quickly create detailed and accurate prototypes, allowing for faster iteration and innovation. The ability to machine complex shapes in a single setup without the need for multiple fixtures or repositioning reduces manufacturing time and costs, making it an effective choice for custom parts manufacturing.
 

The ability to move in five axes gives 5-axis CNC machining many beneficial features. Some of these are as follows.
 

5-axis CNC machines can produce very complex shapes. Many of the shape limitations inherent in 3-axis machining come from the inability of the cutting tool to reach certain areas of the workpiece and perform complex cuts. 5-axis CNC machining overcomes this problem, allowing for extremely complex shapes.
 

Provided you create a design that follows the CNC machining design guidelines, 5-axis CNC machining can produce that design.
 

5-axis CNC machining can produce complete parts in a single cycle, with little need for pauses or breaks to manually reposition the cutting tool or workpiece. The increased automation results in a 30-40% reduction in production time and effort. However, note that these advantages are only achievable in low-volume production. Machining time and effort increase exponentially in medium to large production runs.
 

The availability of additional axes reduces vibration during machining, allows for the use of more precise tools, and allows the cutting tools to be closer to the surface of the workpiece. These factors contribute to a higher quality surface finish.
 

Although 5-axis machining offers many benefits, it also has the following inherent limitations.
 

The initial set-up costs for 5-axis machining are relatively high, with high-end industrial 5-axis machines costing upwards of £150,000 - £1,000,000. Their use is mainly practical for shapes that cannot be accurately machined via 3-axis machining. Compared to 3-axis milling, mill-turn operations typically cost 25% more, indexed 5-axis machining costs 65% more and continuous machining costs 100% more.

The cost difference between continuous and indexed 5-axis CNC machining stems from the differences in machine design and complexity. Indexed 5-axis machines are less complex than continuous 5-axis machines. In these machines, cutting takes place on three linear axes while the rotary axes are responsible for repositioning the workpiece. Cutting is paused for repositioning during rotation and resumes immediately afterwards. In contrast, in a continuous 5-axis machine, cutting occurs simultaneously on all five axes.
 

The two additional machining axes significantly increase the complexity of toolpath programming in 5-axis CNC machining operations.
 

By accessing multiple areas of the workpiece, 5-axis machining produces parts faster than 3-axis machining for one-off, low-volume production. However, machining time, effort, and cost increase exponentially for larger production volumes. Due to the motions used in 5-axis machining, machines typically cut one part at a time. Therefore, the operator must load and unload the machine for each individual part. This is in contrast to 3-axis machining, where multiple parts are machined simultaneously
 

Intech Mechanical is a leading machining company that offers custom 5-axis machining services. Make sure our production team has been operating for a considerable period of time. We have the experience and skills to ensure quality work and turnaround time.

Contact Intech Mechanical for a consultation and accurate machining quote. We are sure of what you get and match the quality of the product you desire.