What's the Difference Between 3, 4, and 5-Axis CNC Milling?

The differences between milling with a number of axes ranging from 3 to 4 and then 5 concern, first of all, the ability to rotate on planes different from the standard one. Consequently, having a milling machine that can count on different axes helps to create complex shapes. This is also what we're talking about: CNC milling or numerically controlled machining is a material removal machining process that uses rotating multi-cutting tools known as mills. Which you can also find in the Krino catalog.

Specifically, we must remember that the mill has continuous rotary motion around its own axis, while the workpiece can have feed movements along one or more axes. Here comes the possibility of addressing the differences between 3, 4, and 5-axis CNC milling. What are the strengths of these solutions and why do we sometimes need a higher number of elements?

The Substantial Difference Between These Procedures

To deepen this concept we can start with a key concept: to deepen the difference between 3, 4, and 5-axis CNC milling. What is the fundamental advantage in preferring one solution over another? Among the different options, the number of directions in which the machine can simultaneously move the workpiece changes, determining the complexity of possible machining.

We can say that increasing the number of axes adds degrees of freedom of movement to the milling machine. Which can follow multiple independent directions along which the tool can move at the same time. So, among the differences between 3, 4, and 5-axis CNC milling we have faster execution speed and the ability to create articulated shapes.

Different Solutions and Axes for CNC Milling

What does it mean, for example, to perform CNC machining with a 3-axis mill? Simply, the machine can move along three linear paths perpendicular to each other where the X axis introduces the lateral horizontal movement and the Y axis proceeds in depth.

Meanwhile, the Z axis adds vertical movement, from this description we can understand that the mill can only machine surfaces accessible from above. So it's perfect for planar machining, pockets, holes, and simple profiles on one side of the element. The 4-axis mill adds yet another possibility: a fourth rotary axis to the three linear ones that can be rotation around the X or Y axis.

In this way we introduce the realization of more complex geometries such as helices and cylindrical parts allowing the machining of inclined planes. 5-axis CNC milling completes the work by operating on the three linear and two rotary axes. Thus it is possible to complete the most complex machining reducing processing times since the positioning required by the project is cut in half.

So Should You Always Use 5-Axis Mills?

It may seem right to think that milling with a higher number of axes of movement is to be preferred to lesser solutions. In reality this is not the case because everything depends on the type of operation to be performed.

Professional machining will be advantaged by this procedure but there are many requests that can be performed by a 3-axis machine. Without forgetting that it is fundamental to choose the right blades, such as the Krino face mills in HSS-co for extremely precise work.