Process Guide

Can CNC Machines Cut Wood?

Yes. A CNC router cuts wood with the same motion control a metal mill uses, but the tooling, speeds and dust handling change. This page is for engineers deciding whether a wood part fits a CNC shop, and how to specify it. You will finish knowing which woods cut clean, which cut fuzzy, and what to put on the drawing.

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Spindle speed 16,000–24,000 rpmTolerance ±0.005 mm on metalDust extraction required

Scope

Wood on a machine that also cuts aluminium

Same gantry, same G-code, different recipe. Here is what actually changes when the workpiece is wood.

Basics

How a router removes wood

A CNC router works on wood the same way a milling machine works on aluminium: a rotating cutter is driven along programmed paths, and material is sheared off in chips. The difference is the cutting edge. Wood is soft, abrasive and fibrous, so the tool bites deeper per pass and the spindle turns much faster.

Wood is not a homogeneous material. Grain direction, moisture content and density vary from board to board, even inside one sheet. A hardwood like maple cuts to a clean edge. A softwood like pine crushes and tears at the exit side unless the tool is sharp and the feed is high enough.

Cutting forces are low compared with steel, so a light gantry router handles most wood parts. The real limits are spindle speed, workholding and dust. Those three decide whether the cut is clean, not the machine frame.

1
Spindle speed matters mostWood needs 16,000–24,000 rpm to shear cleanly. A slow metal spindle burns and glazes the edge.
2
Grain runs both waysClimb cutting against the grain gives a cleaner face. With the grain, fibers lift.
3
Moisture shifts sizeGreen or damp stock moves after cutting. Kiln-dried stock holds tolerance better.

Tooling

Which cutters and feeds work on wood

Two flute carbide end mills are the default for wood. The open flute geometry clears chips fast, which matters because wood makes bulky chips, not the fine swarf you get from aluminium. A two flute tool also leaves more room for chip evacuation at high feed rates.

Compression bits solve a specific problem. They have up-cut flutes at the tip and down-cut flutes above, so the top and bottom edges of a plywood or melamine panel both stay clean. On single-side veneered board, a down-cut spiral keeps the veneer from splintering.

Speeds and feeds depend on density. A safe starting point is 2–4 m/min feed, 0.5–1.5 mm depth of cut, and a stepover of 40–50 percent of tool diameter for roughing. Hardwood wants a lower feed and a shallower bite. Softwood tolerates more. These are starting numbers, not a recipe for every job.

1
Two flute up-cutGeneral profiling and pockets. Good chip clearance, mild top edge tear-out.
2
Down-cut spiralVeneered faces and laminate. Pushes fibers down, protects the top surface.
3
Compression bitDouble-sided panels. Clean edges top and bottom in one pass.
4
Ball nose3D contours and mouldings. Small stepover for a smooth surface.

Selection

Wood species and how they machine

Relative behavior only. Actual results depend on tool sharpness, feed and moisture.

Species	Machining behavior	Best use	Watch out for
Maple	Cuts clean, hard grain	Jigs, tooling boards	Burns if feed is slow
Oak	Firm, open pores	Furniture, fixtures	Splinters on exit edge
Pine	Soft, tears easily	Patterns, mock-ups	Fuzzy edges, resin build-up
Plywood	Layered, glue abrasive	Panels, cabinets	Delamination at edges
MDF	Uniform, dusty	Fixtures, moulds	Heavy dust load, soft edges
Birch ply	Dense, stable	Structural panels	Tool wear from glue

Setup

Workholding, dust and drawing notes

Holding wood is easier than holding steel because cutting forces are low, but the material is soft and marks easily. Vacuum tables suit flat panels and let you cut through without clamps in the way. For smaller parts, screws into waste board or double-sided tape work well. Avoid clamping directly on a finished face.

Dust is not optional. Fine wood dust is a health hazard and an explosion risk in enclosed spaces. A router cutting wood needs extraction at the cutter, not just a shop vacuum nearby. Chips also pack into pockets and can rub the surface, so air blast helps on deep cavities.

On the drawing, state the species, thickness and grain direction. Mark which faces must stay clean. Add a note if the part will be sanded or finished after machining, because that changes the allowance. If the part is a jig or fixture that must hold size, say so, since wood moves with humidity.

1
Vacuum tableFlat panels, through cuts. Needs a spoil board to seal the zone.
2
Screw and tapeSmall or irregular parts. Slow to set up but reliable.
3
Cutter extractionDust shoe or hood at the spindle. Keeps the cut clear and the air safe.

Materials

When wood is the wrong choice

Wood is a good fit for patterns, moulds, fixtures, display parts and low-load prototypes. It is a poor fit when the part carries load, sees heat, or must hold tolerance over months. Wood swells and shrinks with humidity, and no machining process changes that.

If the part needs stiffness or wear resistance, an aluminium or plastic stock is often the better call. GreatLight machines 6061, 7075, POM, PEEK and carbon fibre, and the same drawing can move to a metal shop without a redesign if the geometry is already sound.

There is also a hybrid route. Cut the master pattern in wood, then cast or vacuum form the production parts from it. That keeps tooling cost low for short runs while the delivered part is plastic or metal.

1
Good fitPatterns, jigs, moulds, mock-ups, non-structural panels.
2
Poor fitLoad-bearing brackets, hot parts, tight-tolerance interfaces.
3
Consider insteadAluminium 6061 or POM for stiffness and stable size.

FAQs

Common questions

Can a metal-cutting CNC machine cut wood too?

Physically yes, since the motion control is the same. In practice, the spindle speed is usually too low. A metal mill runs at a few thousand rpm, while wood wants 16,000 rpm or more to shear cleanly.

Dust is the other issue. A metal machine is not built for the dust volume wood produces, and the chips and coolant systems do not mix well. Shops that run both usually keep separate machines.

What tolerance can you hold on wood parts?

Machining itself can hold tight numbers on a rigid setup, but wood moves after cutting as it takes on or releases moisture. A part cut to a few hundredths of a millimeter today may shift by more than that over a season.

For stable interfaces, we recommend metal or an engineering plastic. For wood, specify the fit that matters and allow movement elsewhere.

Which wood is easiest to machine cleanly?

Dense hardwoods like maple and birch ply machine cleanest because the fibers shear rather than crush. MDF is uniform and predictable but dusty.

Softwoods such as pine tear and fuzz easily. They work for mock-ups and patterns where surface finish is not critical.

Do you need special tooling for plywood and laminate?

Yes. A compression bit gives clean top and bottom edges on double-sided panels. A down-cut spiral protects a veneered face. Standard up-cut tools tend to splinter the top layer.

Glue lines in plywood also wear tools faster, so sharpness and replacement intervals matter more than they do in solid wood.

How do you control dust when routing wood?

Extraction at the cutter, not just general shop ventilation. A dust shoe or hood around the spindle captures most chips at the source, and a spoil board underneath handles the rest.

Pockets need an air blast so chips do not pack in and rub the surface. Fine dust also needs proper filtration, since it is a health and fire hazard.

Can wood parts be made alongside metal parts in one shop?

Yes, but they are usually run on separate machines. Metal shops keep wood dust out of coolant and precision ways, and wood shops avoid the oil and chips that mark a finish face.

When a project needs both, we machine the wood pattern and the metal production parts in sequence and keep the dust isolated.