Can I Run a CNC Machine in My Apartment?

A router spinning at 18,000 rpm cutting MDF sits around 85-95 dB at one meter. A benchtop mill cutting aluminium with a 6 mm end mill is quieter, but the interrupted cut still produces a high-frequency scream that drywall and concrete slabs pass along. In a wood-frame building, the floor itself becomes a speaker.

What matters is not your own tolerance. It is the neighbor below you at 22:00. Most leases define quiet hours and many city ordinances set a daytime limit around 55-65 dB at the property line. A machine running inside a room can exceed that through a shared wall.

Practical options exist. An enclosure lined with mass-loaded vinyl can drop the peak by 10-15 dB, and a concrete slab floor helps more than any panel. Even then, expect to run only during daylight hours and to warn the neighbors first.

A 500 kg benchtop mill on four small feet puts several hundred kilograms per square meter on a floor designed for living room loads. Residential slabs are usually rated for 1.5-2.0 kN/m². A heavy machine plus a workbench and stock can approach or pass that on a small footprint.

Vibration is the second problem. A machine that is not bolted down will walk, and bolting into a rented floor damages the surface and often breaks the lease. Cutting fluid spills and metal chips work into carpet and seams, which is one reason landlords write machining out of residential use.

Read the lease before you buy the machine. Many residential leases prohibit commercial activity, and some insurance policies void coverage when a machine tool is operated in a dwelling. A written approval from the landlord is worth more than any vibration mat.

A small mill or router spindle may draw 1-2 kW, and a VFD adds inrush current on start. A standard 15 A / 120 V branch circuit gives about 1.8 kW continuous, so one machine can load a whole room. Running a dedicated 240 V circuit requires a licensed electrician and landlord approval.

Dust is the harder problem. Wood and composite dust is a health hazard and a fire risk. Metal fines from aluminium and brass are conductive and can short electronics. Neither is handled by a shop vacuum alone; you need a cyclone separator and a HEPA filter, and those take floor space.

Coolant and lubricant add their own issues. Mist coolant spreads oil film over a room. Flood coolant needs a tray and a pump and is not realistic on a carpet. For apartment work, dry machining with a small air blast and a chip tray is the only practical path.

Small plastic and wax parts are the sweet spot. A desktop mill cutting POM, ABS or machining wax at 8,000-12,000 rpm is quiet enough for daytime use, and the chips are light. Prototype enclosures, jigs and fixtures under 150 mm are realistic.

Aluminium is possible in light passes. A 3-6 mm single-flute cutter, 0.3-0.5 mm depth of cut and a feed around 600-900 mm/min keeps the load low. Expect longer cycle times and more tool wear than on a production machine.

Steel and titanium are not realistic in a residential unit. They need rigidity, coolant and low spindle speeds that small machines cannot provide. If your design calls for 17-4PH or Ti-6Al-4V, the part belongs on a machine with real mass behind it.

The practical split is simple. Keep the small, soft, low-precision work at home and send out anything that needs tight tolerance, hard metal or a certified finish. That keeps the apartment quiet and the schedule realistic.

At GreatLight we run 127 high-precision CNC machines, including 16 simultaneous 5-axis machining centers, with a maximum processing size of 4,000 mm and tolerances to ±0.005 mm. Surface finishes run from Ra 1.6-3.2 μm as machined down to Ra 0.2-0.8 μm when a finer finish is needed.

There is no minimum order quantity, so one prototype and a 10,000-part run go through the same process. Upload a STEP file and we return a quotation with a free DFM analysis within 12 hours. Production can start within 24 hours, and parts ship in 3-5 days. Uploads stay confidential and an NDA is available on request.