What is CNC Router?
A CNC router is a computer-controlled cutting machine that uses a spinning router bit to cut, drill, shape, and engrave wood and sheet goods based on digital design files, capable of executing complex nesting layouts automatically.
A CNC (Computer Numerical Control) router is a computer-controlled cutting machine that uses spinning router bits to cut, drill, shape, and engrave wood and sheet goods based on digital design files. The machine reads G-code instructions and moves the cutting head along X, Y, and Z axes with positioning accuracy of +/- 0.005 inch.
Common table sizes for woodworking are 4x8 feet (handles full sheets) and 5x10 feet. Spindle power ranges from 2.2 kW for light work to 12+ kW for heavy production. Spindle speed is adjustable from 7,000 to 24,000 RPM.
Price ranges vary widely. Hobby machines (Shapeoko, X-Carve, Onefinity) cost $1,000-3,000. Small business 4x8 models run $5,000-10,000. Professional machines with automatic tool changers (ATC) cost $15,000-30,000. Industrial 5-axis machines reach $100,000+.
Nesting CNC is the most relevant configuration for cut list optimization. Instead of guillotine cuts (edge to edge), a CNC router can cut any shape: rectangles, curves, circles, and irregular polygons. Nesting software arranges parts on sheets accounting for bit diameter (typically 1/4 inch, larger than a saw blade's 1/8 inch kerf), lead-in paths, and holding tabs.
A single CNC program can size panels, drill 35 mm hinge cup holes, cut grooves for back panels, and profile edges. This collapses multiple steps in a traditional workflow into one setup.
For edge quality, use a compression bit (upcut at the bottom, downcut at the top) to get clean faces on both sides of plywood. Vacuum hold-down tables require a minimum part size of about 4x4 inches; anything smaller loses suction and can shift during cutting.
CNC routers represent the most advanced approach to executing a cut list, but a track saw at $400 paired with SmartCutList does the same straight cuts for shops that do not need automated machining.
Frequently Asked Questions
- What can a CNC router do that a regular router cannot?
- A CNC router follows digital toolpaths to cut complex shapes, pockets, and joinery with repeatable precision. It handles curves, inlays, and 3D carving that would be extremely difficult by hand. A regular router requires jigs and templates for each shape.
- How much does a CNC router cost for woodworking?
- Entry-level benchtop CNC routers start around $2,000-5,000. Mid-range machines with 4x8-foot cutting capacity cost $8,000-20,000. Industrial CNC routers run $30,000-100,000+. The Shapeoko, Onefinity, and Avid CNC are popular choices for small to mid-size shops.
- What file format does a CNC router use?
- CNC routers read G-code, which is generated by CAM software from your design files. Common design formats include DXF, SVG, and STL. You design in CAD software, generate toolpaths in CAM, then send the G-code to the machine controller.
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