Two different CNC cutting technologies for two different jobs. Compare materials, precision, speed, cost, and shop requirements to determine which one your shop needs — or whether you need both.
CNC plasma is for cutting metal. CNC router is for cutting wood, plastic, and soft metals. These are different tools for different materials — not competing technologies. If you cut steel, stainless, or thick aluminum, you need plasma. If you cut wood, acrylic, foam, or thin aluminum sheet, you need a router. Many fabrication shops own both because the applications rarely overlap.
| Factor | CNC Plasma | CNC Router |
|---|---|---|
| Primary Materials | Steel, stainless, aluminum, copper, brass | Wood, MDF, acrylic, plastic, foam, soft metals |
| Max Thickness | Up to 1.5" steel (standard), 3" (high-amp) | 3-6" wood, 1" acrylic, 0.25" aluminum |
| Precision | ±0.015 - 0.030" | ±0.003 - 0.005" |
| Cutting Speed (primary material) | 40-200 IPM on 1/4" steel | 100-400 IPM on 3/4" wood |
| Cutting Method | Thermal (ionized gas arc) | Mechanical (spinning bit) |
| Equipment Cost (4x8) | $3,500 - $30,000 | $5,000 - $50,000 |
| Consumables | Nozzle + electrode ($10-$30/set) | End mills + bits ($20-$100 each) |
| Noise Level | 90-110 dB (hearing protection required) | 75-95 dB (moderate to loud) |
| Byproduct Management | Smoke, fumes (water table or downdraft) | Dust, chips (dust collection system) |
CNC plasma cuts any electrically conductive metal: mild steel, stainless steel, aluminum, copper, brass, titanium, and alloys. It cannot cut wood, plastic, glass, or any non-conductive material. CNC routers cut wood, MDF, plywood, acrylic, HDPE, Delrin, foam board, composite panels, and soft metals like aluminum and brass. A router can cut thin aluminum sheet (up to about 1/4 inch), but the process is slow and requires specialized end mills, coolant, and conservative feed rates. For serious metal cutting, plasma is faster by an order of magnitude.
A CNC router is a precision machine. It removes material mechanically with a spinning cutting tool, producing smooth edges with no heat distortion. Tolerances of plus or minus 0.003-0.005 inches are standard. The cut edge is clean enough for assembly or finishing without secondary operations. A CNC plasma cutter is a thermal process — it melts and blows material out of the kerf. The heat-affected zone extends 0.04-0.12 inches from the cut edge, the edge surface has a rough texture, and dross (resolidified metal) may need grinding. Plasma is accurate enough for structural and fabrication work, but not for precision-machined parts.
CNC plasma operating costs include consumables ($10-$30 per nozzle/electrode set, lasting 1-3 hours), compressed air or shield gas ($0-$5 per hour), and electricity ($3-$8 per hour for the plasma source). CNC router operating costs include end mills ($20-$100 each, lasting 5-50+ hours depending on material and feed rate), dust collection ($1-$3 per hour for the blower), and spindle wear. For the specific material each machine is designed to cut, operating costs are reasonable. The mistake is trying to use the wrong machine for the job — routing metal is expensive in bit wear, and you simply cannot plasma-cut wood.
Both machines need similar floor space (a 4x8 machine takes roughly 6x12 feet). The critical difference is environmental management. A CNC plasma table produces smoke, fumes, and UV light that require ventilation (water table or downdraft system), hearing protection, and welding-grade eye protection. A CNC router produces dust and chips that require a dust collection system — typically a 2-5 HP collector with ductwork and filtration. The router is quieter, cleaner, and does not require specialized eye or skin protection. A router can operate in a woodworking shop, a garage, or even a basement with proper dust collection. A plasma table needs a well-ventilated space, ideally a dedicated metal shop.
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A CNC router can cut soft metals like aluminum, brass, and copper, but it cannot cut steel, stainless steel, or other hard metals. Even on aluminum, a router cuts slowly compared to plasma — typically 30-60 IPM at shallow depths of cut (0.03-0.06 inches per pass), requiring multiple passes to cut through the material. A CNC plasma cutter slices through 1/4-inch aluminum in a single pass at 80-120 IPM. If metal cutting is your primary application, plasma is the correct tool.
No. Plasma cutting requires an electrically conductive material to form the arc circuit. Wood, plastic, acrylic, and other non-conductive materials cannot be cut with plasma. If you need to cut both metal and non-metal materials, you need both machines — or consider a fiber laser, which can cut metals and some non-metals (though at significantly higher cost than either a plasma table or router).
A CNC router is significantly more precise. Typical CNC router tolerances are plus or minus 0.003 to 0.005 inches, while CNC plasma tolerances are plus or minus 0.015 to 0.030 inches. A router produces clean, smooth edges with no heat-affected zone, while plasma leaves a heat-affected zone of 0.04 to 0.12 inches and may require secondary finishing. For parts that need tight tolerances or must mate precisely with other components, a router (for compatible materials) delivers superior results.
Operating costs differ by application. A CNC plasma cutter has consumable costs of $10-$30 per nozzle/electrode set (lasting 1-3 hours of cutting) plus compressed air or gas. A CNC router has bit costs of $20-$100 per end mill (lasting 5-50 hours depending on material), plus dust collection. For metal cutting specifically, plasma is cheaper per cut because it removes material in a single pass at high speed. For wood and plastic cutting, a router is the only option and its operating costs are modest — $5-$15 per hour including bit wear and dust collection.
Some hobbyists mount plasma torches on CNC router frames, but this is not recommended. CNC routers are not designed for the heat, slag, and electromagnetic interference produced by plasma cutting. The router frame can warp from radiant heat, slag can damage linear guides and bearings, and the high-frequency electrical noise from the plasma arc can interfere with the router controller. Purpose-built CNC plasma tables use heat-resistant frames, shielded electronics, and water or downdraft systems to manage these challenges. Buy the right tool for the job.