CNC cabinet manufacturing: start here

• 1
  What CNC cabinet manufacturing actually does to a panel
• 2
  Which materials suit CNC cabinet manufacturing
• 3
  3-axis vs 5-axis: what each one buys you
• 4
  Tolerance, finish and fit in cabinet work
• 5
  Choosing a process for a cabinet part

The process starts with a 3D model or a 2D cut list. CAM software turns that geometry into toolpaths: lines of G-code that tell a spindle where to move, how fast to feed, and how deep to cut. The machine then drills shelf-pin holes, mills hinge cups, cuts rabbets and dados, and profiles the panel edge in one setup.

The point is not that a machine is faster than a person. The point is that the 40th panel is cut to the same geometry as the first. When a door is 600 mm wide and a carcass opening is 598 mm, that 1 mm reveal on each side decides whether the door closes clean or rubs the frame. Hand layout drifts across a run. A programmed toolpath does not.

In a typical shop, one operator loads a nesting sheet, runs the program, and unloads finished parts. The spindle changes tools automatically: a 6 mm compression bit for through-cuts, a 35 mm hinge boring bit, a 5 mm drill for shelf pins. Cycle time depends on sheet size and part count, not on how many hinges the door needs.

That repeatability is why CNC cabinet manufacturing fits both one-off prototypes and 10,000-part runs. The first article and the last article come off the same program. Setup cost is paid once, then amortized across every panel.

• 1
  One setup, many featuresDrilling, dadoing and edge profiling happen without re-fixturing the panel.
• 2
  Program-driven repeatabilityGeometry is defined in CAM, so part 1 and part 500 match.
• 3
  Tool changes are automaticA tool carousel swaps bits in seconds, not minutes.

Plywood, MDF, particleboard and laminate all machine well on a router. The binder and density matter more than the species name. MDF cuts clean and holds a sharp edge, which is why it dominates painted doors. Plywood is stronger across the panel and takes screws better at the edges, but its alternating grain can tear out if the bit is dull or the feed is too slow.

Solid hardwood is a different job. Oak, maple and walnut move with humidity, so a cabinet door cut to 600 mm in July may not fit the same frame in January. For solid wood, leave 2–3 mm of movement room in the design and avoid glueing a wide panel into a rigid frame.

Metal parts enter cabinet work as hardware: hinges, slides, handles, levelling feet. GreatLight machines those in aluminium 6061, stainless 304 and 316L, brass C36000 and titanium TC4. Tolerance for a hinge plate is typically ±0.05 mm; a decorative knob can run looser.

Plastics show up as edge banding, drawer runners and clear panels. POM and HDPE machine to a smooth finish. Acrylic (PMMA) needs a sharp single-flute cutter and slow feed, or it chips along the cut.

• 1
  Sheet goodsMDF, plywood, particleboard, laminate: fast nesting, stable geometry.
• 2
  Solid woodMachines well, but design for seasonal movement of 2–3 mm.
• 3
  Hardware metalsAluminium, stainless, brass and titanium for hinges, slides and handles.
• 4
  PlasticsPOM, HDPE and PMMA for runners, spacers and clear panels.

A 3-axis router moves the spindle in X, Y and Z. The cutter always approaches from the top. That covers 90 percent of cabinet work: flat panels, straight dados, hinge cups, shelf-pin holes. If your parts are flat and your features are vertical, 3-axis is the cheaper and faster choice.

A 4-axis machine adds rotation around one axis, usually the A axis. It lets you cut a curved door edge or wrap a profile around a cylindrical leg without re-fixturing. For a run of curved cabinet doors, 4-axis saves a second setup and keeps the profile continuous.

A 5-axis center adds a second rotary axis, so the tool can tilt and reach features on five faces in one setup. That matters for sculpted doors, angled frames and hardware pockets that sit on a sloped surface. GreatLight runs 16 simultaneous 5-axis machining centers with a Ø400 mm rotary table and up to 4,000 mm of travel.

Five axes cost more per hour. Use them when the geometry demands it, not because the machine is impressive. A flat shaker door on a 5-axis center is wasted capacity; a compound-curve door on a 3-axis machine needs three fixtures and still leaves witness marks.

• 1
  3-axisFlat panels, straight cuts, vertical holes. The workhorse for carcasses.
• 2
  4-axisCurved edges and wrapped profiles in one setup.
• 3
  5-axisSculpted doors, angled frames, multi-face features in one setup.

Cabinet tolerances split into two groups. Panel dimensions and hole positions need to be tight enough that hinges and slides line up: ±0.1 mm is a common target for shelf-pin spacing, and ±0.05 mm for hardware mounting. Decorative edges and profiles can run looser, often ±0.2 mm or more.

GreatLight holds ±0.005 mm on metal hardware and ±0.0002 in on imperial drawings. That level is not needed for a wooden door, but it is needed for a machined aluminium hinge plate that must sit flush in a routed pocket.

Surface finish follows the same logic. A painted MDF door needs a smooth, tear-out-free edge so the primer does not show fuzz. Sanding to Ra 1.6–3.2 μm is usually enough before paint. A visible brushed aluminium handle may need Ra 0.8–1.6 μm, and an optical or sealing surface can need Ra 0.2–0.8 μm.

The practical test is a dry fit. Cut one door and one carcass opening, assemble the hinge, and check the reveal. If the gap is uneven, the problem is usually cumulative hole position, not the panel outline.

• 1
  Panel outline±0.1 mm keeps edges and reveals consistent across a run.
• 2
  Hardware holes±0.05 mm so hinges and slides seat without shimming.
• 3
  Metal hardware±0.005 mm on our 5-axis centers for flush-fit plates.
• 4
  FinishRa 1.6–3.2 μm before paint; Ra 0.8–1.6 μm for visible metal.