CNC machining services · Dongguan, China

CNC machining services in China, from our own factory

Precision CNC machining in China for automation, packaging, and industrial equipment parts. 3-axis milling, 3+2 multi-face milling, and CNC turning on about 23 machines we run in Dongguan. Every drawing is reviewed before we quote.

Send Drawings for Quote Capacity & tolerances
Rows of CNC machining centers on the Meili Machining shop floor in Dongguan
Our machining floor, Dongguan
Part held in a CNC lathe chuck during turning
CNC turning
Aluminum bar clamped in a vise on a milling machine table
3-axis milling
3-axis milling
Up to 1000 × 400 × 200 mm
3+2 milling
Multi-face parts in one clamping
CNC turning
Up to Ø400 × 900 mm (approx.)
Tolerances
±0.01 mm on critical features
Who this is for

Best fit for drawings
that need more than a quick price

Meili is a practical choice when the project involves more than commodity parts at the lowest unit cost. We are set up to handle drawing review, tolerance discussion, machining plus finishing coordination, and inspection method confirmation before production starts.

Not the best fit for: price-only commodity parts, projects without drawings or specifications, or regulated parts requiring certifications we do not hold.
CNC machines at Meili Machining workshop, Dongguan
What we do

CNC machining processes under one roof

Milling and turning run on our own machines; finishing is coordinated through managed partners. Send one drawing set and we plan the route for each part.

Three CNC milled housings with pockets, slots, and tapped holes

CNC Milling

In-house

Housings, plates, brackets, and blocks with pockets, slots, contours, and tapped holes, from a single prototype to production batches.

CNC Milling details
Three CNC turned fittings with threads, cross holes, and a hex

CNC Turning

In-house

Shafts, sleeves, bushings, nozzles, and threaded fittings, with milled flats, hexes, and cross holes added where the drawing needs them.

CNC Turning details
Brass frame with pockets, threaded holes, and features on several faces, machined on a 3+2 machining center

3+2 Multi-face Machining

In-house

Parts with features on several faces or angled holes, machined in one clamping on B + C axis positioning, so faces stay aligned to each other.

3+2 milling details
Surface finishing and plating production line

Secondary Processes

Managed partners

Anodizing, plating, heat treatment, EDM, and laser marking arranged by us. Parts come back for final inspection before they ship.

Secondary processes
Capacity & tolerances

What we can machine, and how precisely

Starting points for planning your part. Every drawing is reviewed before we confirm that a tolerance can be held with the planned process. What ±0.01 and ±0.005 mm really take →

ProcessMax part sizeStandardCritical features
3-axis milling5 machines in-house1000 × 400 × 200 mm±0.05 mm±0.01 mm
3+2 multi-face milling10 machines in-houseapprox. 300 × 250 mm
length × height, geometry-dependent		±0.05 mm±0.01 mm
CNC turning~8 lathes, live toolingapprox. Ø400 × 900 mm±0.02 mm±0.005 mm
General tolerance
ISO 2768-m unless your drawing states otherwise
Surface roughness
Down to Ra 0.2 µm as machinedBelow Ra 0.1 µm with polishing, on suitable parts. See our surface finish chart (Ra values)
Quantities
Batches of 20 to 10,000 pcs; prototypes first
Lead time
Confirmed per part number with each quote

Tolerance policy: if a stated tolerance can't be held reliably with the planned material and process, we tell you before production, not after.

Digital micrometer reading 8.255 mm on a machined aluminum part
8.255 mm measuredDrawing: 8.25 ±0.02 mm after plating, checked on a production batch.
Materials

Materials we machine every week

Metals and engineering plastics, often several in one order. Each part number is quoted in the grade on your drawing.

One order of machined parts in brass, stainless steel, carbon steel, 6082 aluminum, POM, nylon, and glass-fiber reinforced plastic
8 materials, one orderBrass, stainless and carbon steel, 6082 aluminum, POM, nylon, and glass-fiber reinforced plastic.
Grade not listed?Send the drawing with the material callout. We confirm availability, equivalents, and lead time before quoting. Send drawings →

Aluminum

606060616082707520245052
Typical parts
Housings, plates, brackets, frames
Finishes
Anodizing incl. color and hard, nickel plating, bead blast

Stainless steel

303304316440C
Typical parts
Shafts, fittings, food-contact parts
Finishes
Passivation, electropolish, bead blast

Carbon & alloy steel

Q235C4516CrMn538CrMoD2
Typical parts
Shafts, gears, fixtures, wear parts
Finishes
Black oxide, zinc plating, heat treatment

Brass & copper

BrassPure copper
Typical parts
Fittings, nozzles, electrical contacts; see CNC machined brass parts
Finishes
As machined, nickel plating, polishing

Engineering plastics

POMNylonGlass-fiber reinforced
Typical parts
Insulators, guides, wear pads, jigs
Finishes
As machined

Titanium

TC4 / Ti-6Al-4V
Typical parts
Lightweight, corrosion-resistant parts
Finishes
As machined, bead blast
Grades, properties, and machining notes in the materials guide
Typical parts

Parts we machine for equipment builders

Real parts from our shop floor, grouped by type, with the details we pay most attention to on each.

Five QPQ-treated black steel fixture parts and one vacuum heat-treated steel block

Hardened steel fixture parts

Steel, QPQ treated (black) and vacuum heat treated

What matters on these parts: Hole positions and flatness, size change from QPQ or heat treatment, and wear resistance on locating and clamping faces.

Machined white engineering plastic parts: split washers, flanged bushings, and a threaded nozzle

Precision plastic parts

Engineering plastics

What matters on these parts: Holding size on a material that moves with heat and clamping force, clean edges without burrs, and threads that seal.

Two nickel-plated 6061 aluminum housings with pockets and mounting holes

Plated and anodized parts

6061 aluminum, nickel plating, color anodize

What matters on these parts: Sizes cut with plating allowance, no burrs or tool marks on cosmetic faces, and packing that protects the finish.

Batch of turned aluminum flanges packed in a formed plastic tray

Repeat production batches

Aluminum, stainless steel

What matters on these parts: The same program and fixture for every batch, a first-article check before the run, and tray packing by part number.

Batch pricing · 20 pcs and up

From 20 pieces, your machined parts cost far less

Most of the cost of a one-off part is the work before the first chip: drawing review, programming, fixturing, and proving out the first part. On one piece, that piece carries all of it. On 20, it is shared twenty ways. Ask for prices at a few quantities, for example 5, 20, and 50, and we'll quote each one.

Quote My Batch How a CNC quote is built: why batches cost less → Low-volume production: batches of 20 to 10,000 pcs →
  • Setup, programming, and first-article check paid once per batch
  • Dedicated fixtures at 20+ pieces: faster loading, identical parts
  • Repeat orders reuse the program and fixtures
Drawing review & inspection

How we keep your parts to the drawing

Most machining problems start as an unanswered question on the drawing. We raise them before you order, check the first part before the batch, and inspect again before shipping.

In-house gauges
Micrometers, calipers, height gauge, thread and pin gauges, optical projector, roughness tester
CMM
In-house Hexagon (Brown & Sharpe) coordinate measuring machine for positions, profiles, and GD&T
Raymond Liang and a machinist checking a turned stainless ring against the drawing at the lathe
Raymond Liang, co-founder, checking a part against the drawing
01

Before you get a quote

  • Missing tolerances, finish callouts, and datums
  • Thin walls, deep pockets, and other deformation risks
  • How plating, anodizing, or heat treatment changes size
You receiveA quote per part number, with open questions listed
02

Before the batch runs

  • How each critical dimension will be measured
  • First article checked against the drawing
  • In-process checks on critical features
You receiveA first-article report, free on your first order
03

Before the parts ship

  • Final inspection with calibrated gauges
  • Cosmetic faces protected, parts separated
  • Boxes labeled by part number and quantity
You receiveDimension report on request, packed ready for your stores

If parts don't match the drawing, we remake them at our cost and pay the freight both ways. Report within 30 days of delivery with photos or inspection data.

Full quality process →
Why buy direct

Skip the trading company, keep the control

Many China CNC machining parts pass through a trading company before reaching you. Ordering from the factory that makes them changes five things. How to choose a supplier in China →

Through a trading companyDirect from Meili
PriceTrading margin added on top of the factory priceFactory price, with no trading margin on top
Technical questionsRelayed to a factory you never speak to, answers come back days laterAnswered by the people who program and machine your part
Your drawingsPassed on to whichever shop has capacity that weekStay with one factory, under NDA if you need one
Schedule changesSecond-hand status updatesDirect from the shop floor, including early warning of a delay
When a part is wrongResponsibility split between the trader and an unnamed subcontractorOne accountable factory: remade at our cost, freight paid both ways

To get a quote, send

  • STEP + PDF drawings
  • Quantity per part number
  • Material and finish
  • Critical dimensions or inspection needs

A whole project can go in one .zip file. PDF, STEP, IGES, DWG, and DXF accepted.

Send Drawings for Quote Supplier information for your purchasing team →
Case notes

How we machined three difficult parts

Real orders from our Dongguan factory: the problem, how we made the part, and what we measured.

SUS430 stainless motor housing with cross pins100 pcs
SUS430 stainless

SUS430 motor housings

A 10 µm band on Ø8. Micrometer readings 7.987 and 7.988 mm against 7.98–7.99.

Read the case note
Thin-wall 304 stainless steel conical ring48 pcs
304 stainless

Thin-wall 304 conical rings

Walls that distort in a normal chuck. A dedicated fixture turned in-house, two operations per ring.

Read the case note
Turned and milled TC4 titanium prototype with grooves and internal pockets30 pcs
TC4 titanium

TC4 titanium prototypes

±0.05 mm on diameters and hole positions, Ra 1.6, M2 threads and Ø1.6 mm holes.

Read the case note
All recent parts and case notes

Common questions

A PDF drawing with tolerances and finish callouts, plus a STEP or IGES model if you have one. Add material, quantity, and finish. A fully dimensioned PDF drawing is enough to start the review.
There is no fixed minimum quantity, but our main work is batches of 20 to 10,000 pieces per part number; prototypes are welcome as the first step toward a batch. From 20 pieces the unit cost drops sharply, because drawing review, programming, and fixturing are shared across the batch. Ask for prices at 5, 20, and 50 pieces and we quote each one. For high volumes we confirm capacity and lead time with the quote.
Critical features to ±0.01 mm milled and ±0.005 mm on turned diameters, confirmed at drawing review. Features without a stated tolerance follow ISO 2768-m.
Simple 6061 aluminum parts in small quantities can be machined in 2 days from stock. For other parts the lead time is confirmed per part number in the quote.
Yes. A first-article inspection report is free on your first order. Dimension reports are available on request, and positions, profiles, and GD&T callouts are measured on our in-house Hexagon CMM with a CMM report on request.
We use 3+2 indexed positioning for multi-face and angled-feature work: the rotary axes position and lock the part before three-axis cutting, so features on several faces are cut in fewer clampings.
Raymond Liang
Reviewed by Raymond Liang, co-founder, 15 years in CNC machining · Updated October 9, 2026