CNC Routing

Definition and explanation of CNC milling in woodworking
Milling is a shaping, material-removing process and, along with turning and grinding, is one of the common methods for producing wood products. CNC milling is used to create freeform shapes with repeatable, computer-controlled precision. Here, we differentiate between 2D and 3D CNC milling.

In this article, you'll find the key information about CNC milling. You'll also learn interesting facts about machinable materials and the applications of CNC milling in woodworking.

Milling on the CNC milling machine

Milling on the CNC milling machine

Table of Contents

Meaning: What is CNC Milling?

CNC routing means processing routable materials using a CNC machine. "CNC" stands for "Computerized Numerical Control." Key features of CNC routing are high efficiency and repeatable precision, as the routing process is controlled by a computer-aided system.

Technical Basics of CNC Milling in Woodworking

When milling in woodworking, you process edges, create contours in panels, or shape any geometries from wood blocks. A CNC milling machine performs these processing steps with repeatable precision, controlled by electronics and electromechanical feeds. This saves time and labor.

  • Edge Machining: A wooden panel or board is guided along a fixed milling head, whose geometry determines the edge.
  • Contour Milling (2D): The milling cutter plunges precisely into a panel and follows a pre-programmed contour.
  • Freeform Milling (3D): Often performed with a robotic arm, which allows for complex machining in three dimensions. The milling head is located in a spindle on the arm.

Variants of CNC Milling in Woodworking

Edge Processing

Here, you guide a board or strip past a stationary milling head. The edge shape results from the geometry of the milling cutter.

CNC Face Milling

Instead of planing with a jointer, the router bit moves over the surface in overlapping passes. Then, you flip the workpiece and mill it again. This way, you can achieve a specific thickness or smooth unusually wide parts.

Contour Milling

With 2D coordinate guidance, the router bit plunges at the defined position and follows the desired contour. This allows you to precisely mill both external and internal contours.

Freeform Milling

For complex 3D designs, a robotic arm with a milling head is often used. This method delivers precise, repeatable results even for unusual freeform shapes.

Tip: router table for CNC wood milling

Chamfering, slots, rounding, sanding, deburring, or flush milling—arouter table a semi-stationary system that enables precise milling work on a sturdy worktable while offering you great flexibility.

Which Materials Are Used in CNC Wood Milling?

Generally, you process soft, machinable materials:

  • Various types of wood: hardwoods like oak or beech, softwoods like pine or spruce
  • Wood-based materials such as MDF, particle board, multiplex, or plywood
  • Plastics (for example, CFRP or GRP), as long as there are no metallic inclusions

Metals can only be processed to a limited extent on woodworking machines, because tool and machine wear would be too high.

Application Areas for CNC Wood Milling

A CNC wood router is used for shaping edges, panels, or blocks. Key examples include:

  • Milling internal and external contours: 2D systems are cost-effective and precise for this.
  • Nesting: All necessary components are cut from a single sheet in one pass.
  • Drilling: Blind, slotted, or through holes can be set automatically.
  • Freeform Milling: 3D machining of complex shapes, for example, via a robotic arm.

Free-form milling with flush trim bit

Free-form milling with the flush trim bit

Industries for CNC Milling

  • Carpenters and joiners
  • Manufacturers of furniture, windows, doors, and timber components
  • Caravan and Motorhome Interior Construction
  • Boat Building
  • Model and Mold Making

CNC milling is versatile: you only need a few manual skills, while the machine produces highly precise individual or series parts.

Which Workpieces Can You Produce from Wood with a CNC Milling Machine?

It depends on whether you're working with flat or block material. You'll use 2D routers for flat stock like panels, and 3D routers for "voluminous" components that need processing in all spatial directions.

  • Furniture fronts and cabinet parts
  • 3D wood models
  • Worktops, letters, engravings
  • Wooden front doors, wooden toys, cabinets
  • Stair treads, windows, fences

Post-processing ofrouter table CNC machining

Post-processing ofrouter table CNC machining

Requirements: Axes and complexity

A 2D router handles panels, but can also manage deeper cuts like blind holes to a certain extent. A 3D system with up to five axes can tackle complex components. The inherent softness of wood and the relatively generous tolerances make this type of system even more versatile.

Tool changers

Automated tool changes boost efficiency. The CNC control independently manages the swapping of router bits or drills. Common setups include:

  • Pick-up changers (few tools)
  • Disc-type tool changer (medium capacity)
  • Chain-type tool changer (large tool selection)

Machine tables

The machine table plays a big role in efficiency. Here are some examples:

  • Console tables with vacuum pods on movable consoles
  • Grid or matrix tables with foam rubber seals and vacuum clamping
  • Flat tables for 2D and 3D work, often featuring clamping technology

Advantages: Wood Milling with a CNC Milling Machine

  • Repeatable, precise, and with low staffing requirements
  • High level of automation
  • Quick machining, no wasted time
  • Safety: Operator is separated from the cutter

Once programmed, the CNC milling machine repeats its movements infinitely. With automated loading, it operates autonomously at optimal performance.

Which Machines Are Used for CNC Wood Milling?

  • CNC machining centers
  • CNC gantry milling machines
  • Single and double column bed milling machines

Furthermore, in woodworking, you'll find table routers, underfloor routers, or stationary routers, though these are not always CNC-controlled.

RUWI Products for Woodworking

RUWI a variety of solutions for woodworking machinery. Whether you want to chamfer edges, cut slots, sand, or trim—arouter table a versatile addition that combines stability and flexibility.

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