CNC Machine Types Guide: Mills, Lathes, Routers, Plasma, and Laser

If you are new to CNC, the first question is not “which machine should I buy?” It is “what type of CNC machine do I actually need?” A CNC mill and a CNC router both cut material under computer control but they serve completely different purposes. A lathe spins the workpiece instead of the tool. A plasma cutter uses electricity and compressed gas. A laser uses a focused beam. A waterjet uses high-pressure water and abrasive. There are at least a dozen machine types available today and picking the wrong one wastes money and causes frustration.

I have been machining for 12 years and have run most of these machines. This guide covers every major CNC machine type including how they work, what materials they handle, typical precision, cost range, and how to choose the right one.

How CNC Machines Are Classified

The Four Categories

CNC machines fall into four main categories based on how they remove material:

Category	Method	Examples
Subtractive	Physical cutting with rotating tool	Mills, lathes, routers
Thermal	Heat to melt or vaporize material	Laser cutters, plasma cutters
Erosive	High-pressure water or electrical sparks	Waterjets, EDM
Abrasive	Grinding wheel wears material away	CNC grinders

Machines are also classified by the number of axes they can move. A 2-axis machine handles simple movements like a lathe cutting diameter and length. A 3-axis machine adds X, Y, and Z movement which handles most milling and routing work. A 4-axis machine adds a rotary axis for indexed or simultaneous multi-sided work. A 5-axis machine provides full freedom to approach the part from any direction which is essential for complex aerospace and medical components.

Axis Classifications

3-axis machines handle the majority of CNC work. 4-axis adds rotary capability for indexed machining. 5-axis provides simultaneous multi-directional cutting for complex parts. Most beginners should start with a 3-axis machine regardless of type. Industrial robots can have 6 axes or more.

The spindle configuration also matters. Vertical spindle machines have the tool pointing down at the workpiece, the most common setup for mills. Horizontal spindle machines have the tool approaching from the side for better chip evacuation and higher productivity. Gantry machines have the tool moving on an overhead beam, standard for large-format routers.

CNC Milling Machines

A CNC milling machine uses a rotating cutting tool that moves across a stationary workpiece clamped to the table. The tool spins at high RPM and cuts along X, Y, and Z axes. Milling machines are the most versatile CNC tool and form the backbone of most machine shops.

There is an important distinction between a CNC mill and a machining center. A machining center has an automatic tool changer (ATC) with a tool magazine that can swap tools without operator intervention. A CNC mill without an ATC requires manual tool changes between operations. Vertical machining centers (VMC) are the most common type. Horizontal machining centers (HMC) have the spindle parallel to the floor which lets chips fall away naturally. HMCs achieve much higher spindle utilization because they can run with pallet changers. Some shops report 85 percent spindle utilization on an HMC compared to roughly 25 percent on a standalone VMC.

Mill Comparison by Size

Type	Example Models	Precision	Price Range (New)	Best For
Entry-level	Tormach 1100MX, Haas Mini Mill	±0.005mm	$25,000-$50,000	Prototyping, small parts
Production VMC	Haas VF-2, Okuma MB series	±0.002mm	$80,000-$150,000	Production runs
HMC	Haas EC series, Makino a series	±0.001mm	$150,000-$400,000	High-volume production
5-axis	Haas UMC, DMG Mori DMU	±0.001mm	$100,000+	Aerospace, medical

CNC mills handle all machinable materials: steel, stainless steel, aluminum, titanium, brass, cast iron, and engineering plastics. Typical precision is ±0.005mm to ±0.05mm. Entry-level mills like the Tormach 1100MX or Haas Mini Mill cost $5,000 to $15,000 used or $25,000 to $50,000 new. Production VMCs range from $80,000 to $150,000. HMCs cost $150,000 to $400,000 or more. Five-axis machines start at $100,000.

Mills are best for anyone making parts from metal including prototyping, production machining, tool and die work, and mold making. They offer the highest precision and widest material range of any CNC machine type. The downsides are the highest cost per machine-hour and a steep learning curve for programming and setup.

Vertical vs Horizontal Machining Centers

A Vertical Machining Center (VMC) has the spindle pointing straight down — the most common configuration. A Horizontal Machining Center (HMC) has the spindle parallel to the floor. HMCs achieve much higher spindle utilization because chips fall away naturally and they can use pallet changers to load parts while the machine cuts. Some shops report 85 percent spindle utilization on an HMC compared to roughly 25 percent on a standalone VMC. HMCs cost significantly more but deliver higher throughput for production work.

CNC Lathes and Turning Centers

A CNC lathe works differently from a mill. Instead of a spinning tool, the lathe spins the workpiece while a stationary cutting tool shapes it. This makes lathes ideal for cylindrical parts like shafts, bushings, fittings, pulleys, connectors, and threaded components.

Modern CNC lathes have evolved far beyond simple 2-axis turning operations. A live-tooling lathe with driven tooling can mill features like flats, slots, and cross-holes without a second operation. This makes them capable of completing complex parts in a single chucking. A Swiss-type lathe can produce complete small parts in one operation by feeding bar stock through a guide bushing. These machines are common in medical device and watchmaking industries.

Lathes handle the same materials as mills including all metals and plastics. They are especially good for round stock where they remove material faster than a mill. Typical precision is ±0.005mm to ±0.02mm. Small used lathes cost $3,000 to $10,000. New production lathes like the Haas ST series cost $40,000 to $100,000. Swiss-type lathes from Citizen or Star cost $80,000 to $200,000 or more. A used CNC lathe is often the best value for a small shop starting cylindrical work.

Lathe Advantages and Limitations

The main advantage of a lathe is fast material removal on cylindrical parts with excellent surface finish. Live-tooling lathes complete parts in a single operation eliminating secondary setups. The limitation is that parts must have rotational symmetry. Complex non-round parts need a mill.

Choosing Between Mill and Lathe

When choosing between a mill and a lathe for a new shop, consider what percentage of your work is cylindrical. If more than half your parts are round, a lathe should be your first machine. If most parts are flat or prismatic, a mill is the better first choice.

All three machine types use the same fundamental G-code language with different axis assignments. Learning to program one type makes learning the others much easier. For small shops, a used engine lathe converted to CNC can be a cost-effective entry point. These manual lathes with CNC conversion kits cost $2,000 to $5,000 and teach the fundamentals of turning before investing in a production machine. The Haas TL-1 is a popular entry-level CNC lathe that bridges manual and CNC operation, offering a useful compromise for shops transitioning from manual machining.

CNC EDM Electrical Discharge Machining

How EDM Works

EDM (Electrical Discharge Machining) uses electrical sparks to erode conductive material. The tool never touches the workpiece. Wire EDM uses a thin brass wire as the electrode and cuts through the part like a powered bandsaw. It achieves the tightest tolerances of any CNC process at ±0.002mm. Sinker EDM uses a shaped electrode to create complex cavities for molds and dies. Hole popper EDM drills small-diameter holes in hardened materials for cooling channels and wire start holes.

EDM is essential for hardened tool steels, carbide tooling, and injection molds where conventional milling cannot cut the material. EDM makes it possible to machine parts that have already been heat treated, eliminating the dimensional changes that occur during heat treatment. The EDM process is inherently slow because material removal happens one tiny spark at a time. Cycle times are measured in hours rather than minutes. However, EDM can achieve features and surface finishes that no other process can match. Used wire EDM machines cost $15,000 to $40,000. New machines from Mitsubishi or Sodick cost $80,000 to $200,000 or more. EDM requires skilled setup and knowledge of electrode materials and dielectric fluids. It is not a beginner-friendly process but it is indispensable for certain work.

EDM Types

Wire EDM uses a thin brass wire as the electrode and cuts through the part like a powered bandsaw, achieving the tightest tolerances at ±0.002mm. Sinker EDM uses a shaped electrode to create complex cavities for molds and dies. Hole popper EDM drills small-diameter holes in hardened materials for cooling channels and wire start holes.

CNC Machine Selection Guide

Choosing the right machine type depends on three factors: material, part geometry, and budget. For wood and plastics a router is the clear choice. For aluminum and steel a mill is required. For round parts a lathe is most efficient. For sheet metal a plasma or laser table saves time. For heat-sensitive materials waterjet is the only option. For hardened tooling EDM is necessary.

Match Machine to Application

Use this simple rule: if you make flat parts from wood or plastic, get a router. If you need precision metal parts, get a mill. If your parts are round, get a lathe. Over 80 percent of all CNC work can be done on 3-axis machines, so start there and upgrade only when you need more capability.

How to Choose

Beginners should start with a 3-axis machine regardless of type. The global CNC machine market was valued at $73.67 billion in 2025 and is projected to reach $115.22 billion by 2032. Asia-Pacific holds 55.7 percent of the market. These numbers reflect growing demand across all machine types.

For more details see our CNC Beginner’s Guide, CNC Mill vs Router comparison, and CNC Buying Guide. If you already know what machine type you need, the next step is learning feeds and speeds or diving into workholding options for your specific setup.

CNC Routers

How Routers Differ from Mills

A CNC router uses a rotating tool on a gantry-style frame. The tool moves on an overhead beam while the workpiece stays on a large table. Routers prioritize work envelope over rigidity — this is the fundamental difference from a mill.

Hobby routers from Shapeoko, Onefinity, and Genmitsu are typically open-frame and lightweight. Industrial routers from Multicam and ShopSabre use steel frames and are built more like gantry mills. Routers handle wood, plywood, MDF, acrylic, polycarbonate, HDPE, aluminum with light cuts, foam, and composite materials. The spindle speed on routers typically ranges from 10,000 to 30,000 RPM which is much higher than a standard mill but with lower torque. This makes routers excellent for small-diameter tools in soft materials but unsuitable for large cutters in hard metals.

One very common misconception among beginners is that a router can replace a mill for aluminum work. While you can cut aluminum on a rigid router like the Onefinity or Avid CNC with light passes and coolant, production aluminum machining requires the rigidity of a real milling machine. The difference becomes obvious when you try to hold tight tolerances or take heavy cuts. A mill with a cast-iron frame simply does not flex the way a router’s gantry does. Typical precision is +/-0.10mm to +/-0.25mm. Desktop hobby machines cost $300 to $3,000. Mid-range machines cost $3,000 to $10,000. Industrial routers cost $20,000 to $80,000 or more.

Routers are the best choice for sign making, cabinetry, guitar building, large flat parts, and hobby woodworking. They offer a large work area for the price. The limitations are lower precision than mills and limited metal cutting capability.

Router Frame Types

When selecting a router, consider the frame construction. Open-frame routers like Shapeoko and Genmitsu are affordable and adequate for wood and plastics. Enclosed routers with steel frames like Avid CNC and ShopSabre can handle light aluminum and offer better precision. Moving-gantry routers are common for large sheets while fixed-gantry moving-table designs offer better rigidity for heavier cutting.

When selecting a router, consider the frame construction. Open-frame routers like Shapeoko and Genmitsu are affordable and adequate for wood and plastics. Enclosed routers with steel frames like Avid CNC and ShopSabre can handle light aluminum and offer better precision. The gantry design determines the machine rigidity: moving-gantry routers are common for large sheets while fixed-gantry moving-table designs offer better rigidity for heavier cutting.

CNC Plasma Cutters

How Plasma Cutting Works

A plasma cutter uses an electrical arc and compressed gas to cut through conductive metal. The torch follows a CNC path while the arc burns through the material. There are no cutting forces or tool deflection involved. Plasma is fast: a table can cut quarter-inch steel plate at over 100 inches per minute — 5 to 10 times faster than a mill.

Plasma cuts steel, stainless steel, and aluminum from 24 gauge up to 2 inches or more. Precision is ±0.5mm to ±1.0mm due to dross and the heat-affected zone. DIY tables cost $1,000 to $5,000. Complete systems cost $5,000 to $20,000. Industrial systems from Hypertherm cost $30,000 to $100,000 or more. Plasma is best for structural steel, metal art, automotive parts, and production plate cutting.

Plasma vs Laser vs Waterjet

For sheet metal cutting, plasma is the fastest option for thicker materials (over 1/4“). Laser provides better edge quality on thinner materials. Waterjet cuts any material without heat but is slower and more expensive. Choose plasma for speed on thick steel, laser for precision on thin sheets, and waterjet for materials sensitive to heat.

CNC Laser and Waterjet

Laser cutters use a focused beam to melt or vaporize material. CO2 lasers handle non-metals like wood and acrylic. Fiber lasers cut metals. Precision is ±0.1mm to ±0.3mm. Desktop CO2 units cost $400 while industrial fiber lasers cost $200,000 or more.

Waterjets use ultra-high-pressure water at 60,000 PSI mixed with abrasive garnet to cut anything including metal, stone, glass, and ceramic without generating heat. This zero heat-affected zone (HAZ) is the defining advantage. Precision is ±0.05mm. Entry-level waterjet systems from WARD or OMAX cost approximately $20,000 to $40,000. Industrial 5-axis waterjet systems from Flow or KMT cost $100,000 to $300,000 or more.

Machine Type Quick Comparison

Machine	Best Materials	Precision	Price Range	Best For
Mill	All metals, plastics	±0.005mm	$5K-$400K	Precision metal parts
Router	Wood, plastics, light Al	±0.10mm	$300-$80K	Large flat parts, signs
Lathe	Round parts in any material	±0.005mm	$3K-$200K	Shafts, bushings
Plasma	Conductive metal sheet	±0.5mm	$1K-$100K	Structural steel
Laser	Wood, acrylic, thin metal	±0.1mm	$400-$200K	Sheet goods, engraving
Waterjet	Any material	±0.05mm	$20K-$200K	Heat-sensitive materials

CNC Mill vs Router vs Lathe

Machine	Precision	Materials	Learning Curve	Starting Price
Mill	Highest	Any metal	Steep	$5,000 used
Router	Moderate	Wood, plastic, light Al	Moderate	$300
Lathe	Highest	Round parts only	Steep	$3,000 used

My rule of thumb: if you make flat parts from wood or plastic get a router. If you need precision metal parts get a mill. If your parts are round get a lathe. Over 80 percent of all CNC work can be done on 3-axis machines so start there and upgrade only when you need more capability.

G-Code: Mill vs Lathe

The same basic operation — facing a surface — uses G-code with different axis conventions:

; Mill — face the top of a block
G90 G94 G17 G54
M3 S3000
G0 X0 Y0 Z0.5
G1 Z-0.02 F20     ; Plunge to depth
G1 X4.0 F40        ; Face across
G0 Z0.5
M5 M30

; Lathe — face the end of a shaft
G90 G94 G54
M3 S1500
G0 X1.5 Z0.1
G1 Z-0.02 F10      ; Face the end
G1 X-0.05 F20      ; Cut past center
G0 Z0.1
M5 M30

The mill moves the rotating cutting tool across the stationary workpiece. The lathe moves the cutting tool along the spinning workpiece. Both use standard G-code with different axis orientation.

Whichever machine type you choose, the most important factor is matching the machine to your specific materials and the parts you plan to make. A router that perfectly cuts wood signs will not cut steel. A mill that precision-machines aerospace brackets is overkill for plywood cabinets. Take time to honestly assess your needs before buying any CNC machine, and consider starting with a used machine to learn the fundamentals before investing in new equipment. A mill that precision-machines aerospace brackets is overkill for plywood cabinets. Define your materials first, then choose the machine.

For help choosing your first machine, see our CNC Machine Buying Guide and CNC Mill vs Router comparison.