Machining
CNC Turning Services
CNC turning spins the bar and cuts round parts such as shafts, pins, bushings, rings and threaded parts.
Best forRound or threaded parts
2CNC Machining Services · Dongguan, China
CNC Machining Services, All Under One Roof.
We make custom metal and plastic parts: turning, milling and precision machining, plus sheet metal cutting, bending, stamping, welding and finishing. One sample or regular orders — one factory, one quote.
NDA before you share files · Factory direct since 2014
700+Machines in our factory
Since 2014Our own factory in Dongguan
3 in 1Machining · sheet metal · finishing
1 pcNo fixed minimum — single prototypes are fine
Our Services
Which CNC Machining Services Does Your Part Need?
Dayao offers 11 custom CNC machining services from one factory in Chang’an, Dongguan: CNC turning, CNC milling and 5-axis machining for solid parts; laser cutting, bending, welding and stamping for sheet metal; surface finishing; and three order sizes, from one prototype to repeat production. Round parts usually go to turning, flat or box-shaped parts to milling, and metal boxes to sheet metal. Pick your part type below to see which services fit.
Machining
Cutting metal or plastic from a solid block or bar until only the part is left.
3 servicesMachining
CNC Milling Services
CNC milling cuts flat and box-shaped parts such as housings, brackets, plates and parts with pockets.
Best forFlat faces, pockets and holes
Machining
5-Axis CNC Machining
5-axis CNC machining reaches features on many sides of a complex part in one setup.
Best forComplex shapes and angles
Sheet metal
Flat metal sheets that are cut, bent and joined into parts and boxes.
4 servicesSheet metal
Sheet Metal Fabrication Services
Sheet metal fabrication cuts, bends and joins metal sheet into boxes, frames, brackets and panels.
Best forBoxes, frames and covers
Sheet metal
Laser Cutting Services
Laser cutting cuts flat shapes, holes and vent patterns out of metal sheet without a die.
激光功率 / 可切板厚 待核实
Best forFlat shapes and cut-outs
Sheet metal
Sheet Metal Welding Services
Sheet metal welding joins cut and bent parts into one strong piece with handheld laser welding.
其它焊接方式（氩弧焊 / 点焊）待核实
Best forParts that need joining
Sheet metal
Metal Stamping Services
Metal stamping presses many identical flat or bent parts quickly once a die is made.
自制模具 / 冲压吨位 / 级进模 待核实
Best forLarge numbers of the same part
Finishing
Coating, polishing and marking the outside of your part.
1 serviceFinishing
Surface Finishing Services
Surface finishing adds sand blasting, painting, polishing, plating, anodizing, brushing, silk-screen or laser marking.
厂内 / 外协 待核实
Best forProtection, color and logos
By quantity
The same machines — sized to how many parts you need.
3 servicesBy quantity
CNC Prototyping
CNC prototyping makes a few sample parts in the real material so you can test the design.
Best forTesting a new design
By quantity
Low-Volume Manufacturing
Low-volume manufacturing makes a first small batch, with no fixed minimum order for machined or sheet metal parts.
Best forYour first small batch
By quantity
Contract Manufacturing
Contract manufacturing makes the same parts again and again on your delivery schedule.
Best forRegular, repeat orders
03Precision
What Tolerances Does Precision CNC Machining Hold?
Dayao’s precision CNC machining holds ±0.01 mm as the standard tolerance and ±0.005 mm on critical features, measured on a CMM (coordinate measuring machine). For comparison, ISO 2768-m — the usual default when a drawing gives no tolerance — allows ±0.2 mm on a 6–30 mm dimension. Ask for ±0.005 mm only on the features that need it, because tighter tolerances need slower cutting and more measuring.
- 01
Check the drawing
An engineer reviews every drawing and marks which sizes need ±0.01 mm or ±0.005 mm, and which can follow a general tolerance.
- 02
Plan the job
The engineer picks the machine, the tools and the way the part is held, using a 5-axis center when features sit on many sides.
- 03
Check the first part
The first part of each batch is measured before the rest are made, so one setup mistake does not become a hundred bad parts.
- 04
Check during and after
IPQC checks parts while they are machined and OQC checks them again on the CMM before shipping, so a drift is caught before parts are packed.
Tolerance levelRange, 0.5–120 mm
ISO 2768-m (medium)±0.1–0.3 mm
ISO 2768-f (fine)±0.05–0.15 mm
Dayao standard±0.01 mm
Dayao critical features±0.005 mm
ISO 2768 rows are general reference values, not Dayao’s limits. Learn more: CNC machining tolerances explained.
Source: ISO 2768-1:1989, general tolerances for linear dimensions (classes f and m); Dayao factory data (2026).
Which Process?
Turning, Milling, 5-Axis or Sheet Metal: Which CNC Process Fits Your Part?
The right CNC process depends on the shape of the part. CNC turning suits round or threaded parts such as shafts and pins. CNC milling suits flat faces, pockets and holes. 5-axis machining suits complex parts with features on many sides. Sheet metal suits boxes, frames and brackets bent from flat sheet. Find your part type in the table: the blue dot marks the best process.
| Your part has… → use this | Turning | Milling | 5-Axis | Sheet metal | Laser | Stamping | Welding |
|---|---|---|---|---|---|---|---|
| Round or threaded parts | Best choice | Also works | Also works | ||||
| Flat faces, pockets and holes | Also works | Best choice | Also works | ||||
| Features on many sides | Also works | Best choice | |||||
| Metal boxes and frames | Also works | Best choice | Also works | ||||
| Flat shapes and cut-outs | Also works | Best choice | Also works | ||||
| Many identical flat parts | Also works | Best choice | |||||
| Parts that need joining | Also works | Best choice |
Best choiceAlso worksMany parts need two processes — we do both.
By Quantity
Prototypes, Small Batches or Contract Manufacturing: Which Order Size Fits?
Dayao has no fixed minimum order for machined and sheet metal parts, so you can start with one prototype. Choose CNC prototyping for a few test parts, low-volume manufacturing for a first small batch, and contract manufacturing when the design is final and you need the same parts again on a schedule. All three run on the same machines, and the lead time is confirmed in each quote.
CNC Prototyping
- Good for you if
- You have a new design and need a few sample parts to test it.
- Not for you if
- You already need parts every month.
Low-Volume Manufacturing
- Good for you if
- Your samples work, and you want a small batch to test the market. There is no fixed minimum order.
- Not for you if
- You need the same parts every month for years.
Contract Manufacturing
- Good for you if
- Your design is final, and you need the same parts again and again.
- Not for you if
- You want a finished product with your brand — see product OEM/ODM.
NoteWant a finished product with your brand, not just parts? See product OEM/ODM — our hand coffee grinder line assembles 2,000 units a day.
Materials & Finishes
What Material and Finish Do Most CNC Machined Parts Use?
Most CNC machined parts start in aluminum 6061-T6, because it is light, machines quickly and takes anodizing well. Stainless steel 304 or 316 is chosen for food contact or outdoor rust resistance, brass or copper for electrical parts, and POM plastic for low-friction parts. The finish follows the material: anodizing for aluminum, brushing or polishing for stainless steel, and powder coating or plating for steel.
Materials page
Metals and plastics compared
The Materials page compares aluminum, stainless steel, steel, copper, brass and plastics, and shows which process fits each one.
Go to Materials → Materials page · FinishesEight surface finishes explained
The finishes section explains eight finishes, from sand blasting to anodizing, with what each one looks like and when to use it.
See the 8 finishes →Before You Buy
Is a CNC Machining Service in China Right for Your Parts?
A CNC machining service in China suits buyers who want factory-direct parts and can plan for sea or air shipping. Dayao has run its own factory in Chang’an, Dongguan since 2014, with 700+ machines, CMM inspection and IQC, IPQC and OQC checks. An NDA can be signed before you share files, every drawing is reviewed by an engineer, and orders ship FOB, EXW, CIF or DDP.
ImageFactory floor — Chang’an, Dongguan (~900×700)
- Started
- 2014
- Location
- Chang’an, Dongguan, Guangdong
- Machines
- 700+ in our factory
- Shipping
- FOB · EXW · CIF · DDP
- 01
Are you a real factory?
Yes. We own our factory in Chang’an, Dongguan. We started in 2014 and have 700+ machines. You are welcome to visit or order samples.
On our website - 02
Will an engineer look at my design?
Yes. An engineer reviews every drawing before quoting. If a feature will raise the cost or cause problems, the engineer tells you before production.
On our website - 03
Is my design safe with you?
Dayao can sign an NDA (non-disclosure agreement) before you send any drawings or 3D files.
On our website - 04
What accuracy can you hold — and prove?
Dayao holds ±0.01 mm as standard and ±0.005 mm on critical features. Parts are measured on a CMM (coordinate measuring machine), with IQC, IPQC and OQC checks at incoming material, during production and before shipping.
On our website - 05
Which payment terms do you accept?
Dayao accepts T/T, L/C, D/P and Western Union. The payment terms are agreed in the contract before production starts.
On our website - 06
Can you do machining, sheet metal and finishing in one order?
Yes. Turning, milling, laser cutting, bending, stamping, welding and finishing can all go on one order. 表面处理厂内 / 外协 待核实
On our website - 07
How long will it take?
It depends on the part, the material and the quantity. We tell you the lead time in the quote, before you order.
On our website - 08
Do you ship to my country?
Yes — FOB, EXW, CIF or DDP, as defined in Incoterms 2020. We ship to North and South America, Europe and Southeast Asia.
On our website
Source: Dayao factory data (2026); trade terms as defined in Incoterms® 2020, International Chamber of Commerce.
FAQ
CNC Machining Services FAQ
CNC machining services at Dayao start with no fixed minimum order, so one prototype is fine. Dayao holds ±0.01 mm as standard and ±0.005 mm on critical features, an engineer reviews every drawing before quoting, and the lead time is confirmed in each quote instead of a fixed promise. An NDA can be signed before you share files. The answers below cover services, accuracy, terms and finished products.
Q01
What CNC machining services do you offer?
Dayao offers CNC turning, CNC milling and 5-axis machining; sheet metal work (laser cutting, bending, stamping and welding); surface finishing; assembly and packaging; and prototypes, small batches or regular production — all from one factory in Dongguan, China.
Q02
What is the difference between low-volume and contract manufacturing?
Low-volume manufacturing is one small batch — for example, to test the market. Contract manufacturing is making the same parts again and again on a schedule. Want a finished product with your own brand? See product OEM/ODM.
Q03
How accurate is your precision CNC machining?
Dayao holds ±0.01 mm as the standard tolerance and ±0.005 mm on critical features, checked on a CMM (coordinate measuring machine). As a general reference only, ISO 2768-1 class m — the usual default when a drawing gives no tolerance — allows ±0.1 to ±0.3 mm on dimensions from 0.5 to 120 mm.
Q04
Is there a minimum order?
No. There is no fixed minimum order for machined and sheet metal parts, so you can start with a single prototype. 样品收费方式待核实
Q05
How long do quotes and production take?
An engineer reviews every drawing, so there are no instant or automatic quotes. Production time depends on the part, the material and the quantity. Your quote lists tooling, part price and lead time separately, so you know before you order.
Q06
Can you machine, make sheet metal parts and finish them in one order?
Yes. Machined parts, sheet metal parts and their finishes can share one quote, one order and one shipment. 表面处理厂内 / 外协 待核实
Q07
Do you sign an NDA before I send drawings?
Yes. Dayao can sign an NDA (non-disclosure agreement) before you send any drawings or 3D files.
Q08
Which payment and shipping terms do you accept?
Dayao accepts T/T, L/C, D/P and Western Union, and ships FOB, EXW, CIF or DDP as defined in Incoterms 2020 by the International Chamber of Commerce.
Q09
Do you also make finished products?
Yes. Dayao machines, assembles, tests and packs complete products — for example, its hand coffee grinder line assembles 2,000 units a day. See product OEM/ODM.
Sources and standards used on this page
- ISO 2768-1:1989, General tolerances — Part 1: Tolerances for linear and angular dimensions without individual tolerance indications (International Organization for Standardization).
- Incoterms® 2020 — FOB, EXW, CIF and DDP trade terms (International Chamber of Commerce).
- Dayao factory data (2026): founded 2014, 700+ machines, ±0.01 mm standard and ±0.005 mm critical tolerance, CMM inspection with IQC / IPQC / OQC, no fixed minimum order, grinder line output of 2,000 units a day.
Reviewed by the Dayao engineering team · Updated October 2026
Where to Go Next
Send Your Drawing and Get a CNC Machining Quote
Send CAD files for turned, milled, 5-axis or sheet metal parts. An engineer at Dayao reviews every drawing before quoting, and the quote lists tooling, part price and lead time separately. Dayao can also finish, assemble and pack your parts. Not sure what to include? See what to send for a quote.