A to Z Guide to CNC Milling
CNC milling explained: process steps, machine components, axis types, materials, costs, and how FACTUREE sources milling partners.
09 Sep, 2026. 2 minutes read
This article was first published on
www.facturee.deWhat is CNC milling?
CNC stands for Computerized Numerical Control.
In CNC milling, FACTUREE uses a rotating tool that removes material from a workpiece. The machine’s movements are entirely controlled by a program. FACTUREE classifies CNC milling as a subtractive manufacturing process. In this process, material is selectively removed until the desired geometries are achieved.
The technological origins of CNC control date back to the 1970s. Since then, the technology has evolved into one of the most precise and reliable manufacturing processes.
The key difference from conventional milling lies in the control system. In conventional milling, an operator guides the tool manually, which requires experience and constant attention. In CNC milling, a program takes complete control of the tool path, spindle speed, and feed rate. This significantly improves repeatability and precision.
The CNC Milling Process: Step by Step
The CNC milling process is a precisely structured sequence of steps that ranges from digital design to final quality control. It involves several key phases.
The steps in the CNC milling process can be summarized as follows:
CNC Milling Machine: Design, Axes, Special-Purpose Machines
The CNC milling machine is at the heart of modern manufacturing and consists of various components, axis configurations, and specialized tables that, together, enable precise machining.
The Eight Key Components
A CNC milling machine consists of several key components that work together to enable precise machining.
Component | Function |
| Chuck | Holds the milling tool securely in place |
| Tool spindle | Generates the rotational motion of the tool |
| Workpiece clamping | Secures the workpiece during machining |
| Tool-Changing Device | Automatically switches between different tools |
| Coolant-lubricant | Reduces friction and heat generation |
| Control Unit | Processes the G-code and controls all movements |
| Milling tool | Removes material from the workpiece |
| Control Panel | Enables manual control and monitoring |
Why is retraining a risk when switching suppliers?
The number of axes determines which geometries a CNC milling machine can machine.
- 3-axis machines are suitable for simple geometries involving movements along the X, Y, and Z axes.
- 4-axis machines include a rotational axis to allow for additional machining angles.
- 5-axis machines enable the machining of complex components and shapes, allowing for the machining of more complex geometries in a single operation—such as turbine blades—since the tool and workpiece can be moved simultaneously in five directions.
- Portal milling machines, on the other hand, are designed for large-format workpieces, in which the tool is guided over a fixed gantry.
Special Machine Tables
Console tables are height-adjustable and suitable for flexible clamping setups. Grid or matrix tables feature a grid of holes for quick workpiece clamping. Smooth tables provide a flat, continuous surface and are particularly well-suited for large or irregularly shaped workpieces.
Read the article on FACTUREE's website to find out more about milling processes, machine axes, material selection, and cost factors in CNC milling: https://www.facturee.de/en/cnc-milling/