The reliable place to
source your rapid
prototypes
and
custom CNC parts

Milling, turning, wire and sinker EDM, sheet metal and 35+ finishes under one roof in Dongguan. Send a drawing; within 16 hours Bill sends back price, lead time, and the two or three changes that would make the part cheaper.

NDA on requestFirst article measured on CMM±0.01 mm (±0.0004 in) tolerance
Machined aluminium housings, rings and a slotted disc produced at GY Machining in Dongguan
16 hQuote turnaround
NoneMinimum order
95%On time, 2025
11Countries shipped
35+Finishes in house
Capabilities

Precision CNC Machining Capabilities

GY machines custom metal parts in aluminium, brass, stainless steel, copper and steel, and CNC plastic parts in Delrin (POM), Nylon, PEEK and other engineering plastics — milled, turned, EDM-cut and finished on our own floor in Dongguan. 32 machining centres, 12 lathes and 12 EDM machines under one roof, and every first article is measured on a CMM before the run continues. Nothing is subcontracted out of sight.

Four-axis CNC machining centre cutting a brass part at GY Machining

CNC Milling

Housings, brackets, manifolds, plates and fixtures on 2-, 3- and 4-axis centres. Thirteen of the 32 centres are four-axis, so multi-face parts stay in one setup and true position holds between features.

  • Achievable tolerance±0.01 mm on critical features
  • Envelope800 × 600 × 500 mm
  • Axes2 / 3 / 4 — no 5-axis
  • Machines32
More on CNC milling →
CNC lathe turning a stepped stainless steel shaft at GY Machining

CNC Turning

Shafts, bushings, pins, fittings and threaded parts on twelve CNC lathes. Turned parts that need cross-holes or flats go straight to a milling setup in the same building.

  • DiameterØ 3 – 250 mm
  • FitsISO 286 IT6 – IT8
  • ThreadsMetric, UN, UNF, NPT
  • Machines12
More on CNC turning →
Row of wire and sinker EDM machines on the GY Machining shop floor in Dongguan

Wire & Sinker EDM

Six wire EDMs and six sinker EDMs for sharp internal corners, hardened tool steel, thin slots, keyways and features a cutter simply cannot reach. Electrodes are made in-house.

  • Wire EDM6 machines
  • Sinker EDM6 machines
  • Typical useHardened steel, dies
  • Corner radiusFrom 0.1 mm
Wire & sinker EDM →
CNC machining centres on the GY Machining shop floor in Dongguan

Sheet Metal

Punching, bending, forming and welding for enclosures, panels, chassis and brackets — finished and assembled with the machined parts that go inside them.

  • Punching machines4
  • ProcessesPunch, bend, weld
  • MaterialsSteel, stainless, alu
More on sheet metal →
CNC machined aluminium prototype wheel hubs with spoke pockets, milled and turned by GY Machining

Rapid Prototyping

One to fifty pieces, cut from the same machines and measured the same way as production. Send a STEP file and a drawing; you get a price in 16 hours and, for most aluminium and plastic parts, finished pieces on their way within a week.

  • Quantity1 – 50 pcs
  • Typical lead time5 – 10 working days
  • ThenSame tooling for production
Quote a prototype →
Anodised aluminium blue heat sink and gold anodised blocks machined at GY Machining

Surface Finishing

Anodising in clear, black, colour and hard coat, plus plating, powder coating, black oxide, passivation, blasting, brushing, tumbling and hand polishing. All managed by us, on one invoice.

  • Finishes offered35+
  • AnodisingType II & III
  • DeclarationsRoHS / REACH
All surface finishes →
Why buyers stay with us

Four things you get on every order

We are a small factory competing with big platforms. These are the four places we decided not to cut corners.

Your drawings stay in the shop

Files are used to quote and make your parts, nothing else. Never shared with other suppliers, never posted. We sign your NDA before you send anything, or send you ours.

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An engineer answers, not a bot

Bill reads every drawing before it is priced. If a tolerance or a feature will double the cost, you hear about it in the quote — not after the first article.

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Door to door, tracked

DHL, FedEx or UPS to your dock, or your own forwarder. Commercial invoice and HS codes with every shipment, so nothing sits in customs waiting on paperwork.

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If a part is wrong, we fix it

Every first article is measured on the CMM before the run starts. If a toleranced feature is out on delivery, tell us within 14 days — we remake or credit it.

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Materials

100+ materials, 35+ surface finishes

Six material families and more than a hundred grades in regular use, finished in-house or with partners we have used for years. If your drawing calls out an EN, DIN or JIS grade we cross-reference it and confirm the equivalent on the quote. EN 10204 3.1 material certificates on request.

Aluminium

Grades & data →
6061-T67075-T6505260822024

The default for housings, brackets, heat sinks and fixtures: light, fast to machine, anodises well. 7075 when you need near-steel strength.

  • MachinabilityExcellent
  • FinishesAnodise, bead blast, chromate
  • Typical useEnclosures, plates, fixtures

Stainless steel

Grades & data →
303304316L17-4 PH416420

Corrosion resistance for fittings, valve bodies, medical and food-contact parts. 303 for volume turning, 316L for marine and chemical, 17-4 PH when it must be hard.

  • MachinabilityFair to good
  • FinishesPassivate, electropolish, bead blast
  • Typical useFittings, shafts, manifolds

Brass & copper

Grades & data →
C360C260C110C101Beryllium copper

Brass for fittings, knurled parts and decorative hardware; copper when thermal or electrical conductivity is the point.

  • MachinabilityExcellent (C360)
  • FinishesPolish, plate, black oxide
  • Typical useFittings, contacts, heat spreaders

Titanium

Grades & data →
Ti-6Al-4V (Gr.5)Gr.2Gr.23

Half the weight of steel with the same strength, and it does not corrode. Slower to cut, so we run it with the right tooling and coolant rather than fast.

  • MachinabilitySlow, well understood here
  • FinishesStone-wash, anodise (colour), blast
  • Typical useKnife scales, aerospace-style brackets

Steel & tool steel

Grades & data →
1018 / 104541404340D2 / SKD11A2S7

Mild and alloy steels for shafts, gears and structural parts; tool steels heat-treated and finished on wire EDM or by grinding.

  • MachinabilityGood (annealed)
  • FinishesBlack oxide, zinc, nitride, paint
  • Typical useShafts, gears, dies, wear parts

Engineering plastics

Grades & data →
Delrin (POM)Nylon 6/6PEEKPTFEPolycarbonateUltem (PEI)ABSHDPEPPSG10

Machined, not moulded, so one piece costs the same per part as a hundred. Delrin for precision, PEEK for heat and chemicals, PTFE for low friction.

  • MachinabilityExcellent to good
  • FinishesAs-machined, bead blast
  • Typical useBushings, insulators, medical
Cross-referencedASTM, EN, DIN, JIS and GB grades matched and confirmed in writing before we buy stock.
Certified on requestEN 10204 3.1 mill certificates supplied with the parts when the drawing or PO asks for them.
35+ finishesAnodising, plating, powder coat, black oxide, bead blast, brushing, polishing, stone-wash, passivation and more.
Not on the list?Inconel, Monel, bronze, magnesium, tungsten and most specialty alloys can be sourced — ask on the RFQ.
Quality

Every part measured before it ships

A temperature-controlled measuring room, a first article checked on the CMM before the rest of the run is cut, and a dimensional report with the values we actually measured. We are not ISO 9001 certified — we would rather tell you here than have you find out later.

01

Material checked in

Grade and heat number confirmed against the mill certificate before bar or plate reaches a machine. Where the drawing calls for a hardness, it is verified by an independent test house. EN 10204 3.1 certificates on request.

02

Checked at the machine

Operators measure critical features between operations with gauges and micrometers, so a drifting tool is caught in minutes, not at final inspection.

03

First article on the CMM

The first piece of every run is measured on a bridge-type CMM against your datums. The run only continues once it passes.

04

Report with the parts

One page per part: nominal, tolerance, measured value and deviation for every toleranced feature. Unmarked dimensions to ISO 2768-mK.

05

Surface finish and thread check

Roughness measured by an independent test house where Ra is called out; threads verified with GO / NO-GO gauges; plated and anodised parts checked for coating thickness and colour against the approved sample.

06

Final inspection and packing

100% visual check on every piece, sampled dimensional check on the batch to AQL, then parts packed in trays or foam with the report, packing list and photos sent to you before the box is sealed.

Bridge-type CMM in the temperature-controlled measuring room at GY Machining
Sample first-article dimensional inspection reportSample report · click to open
  • InspectionCMM · Renishaw PH10M
  • OpticalProfile projector · VMS
Who you deal with

Three people, start to finish

No account managers and no ticket numbers. The owner, the engineer and your coordinator quote your part, follow it through the shop and ship it.

Will, founder and general manager of GY Machining

Will

Founder & General Manager

Bought the first machining centre in 2008 and still walks the floor every day. Decides what we can and cannot take on.

Eileen, project coordinator at GY Machining

Eileen

Project Coordinator

Your first and last contact. Quotes, order status, photos before shipment and the tracking number afterwards.

Bill, engineering manager at GY Machining

Bill

Engineering Manager

Reads every drawing before it is priced, writes the DFM notes and signs off the first-article report.

About GY Machining

Inside our factory

Dongguan Guangyi Hardware Factory runs 32 machining centres, 12 CNC lathes and 12 EDM machines under one roof in Dalingshan, with a temperature-controlled measuring room and a sample room full of the custom parts we have made for customers in 11 countries. Small enough that the owner still checks the drawings; big enough to run 10,000 pieces.

The GY Machining team on the shop floor in Dalingshan, Dongguan
Row of CNC machining centres on the GY Machining shop floor
Machinist at a vertical machining centre in the milling bay
CNC turning centre with live-tooling turret and sub-spindle at GY Machining, Dongguan
Wire and sinker EDM machines at GY Machining
Bridge-type CMM in the temperature-controlled measuring room
Sample room with cabinets of retained customer parts
Production batch of CNC milled aluminium bearing housings on a pallet at GY Machining

Send the drawing. You will have a price and a lead time in 16 hours.

STEP, IGES, X_T, DWG, DXF or PDF. Metric or inch. No minimum order.

FAQ

Questions we get every week

What tolerance can you actually hold?
Unmarked dimensions follow ISO 2768-mK. Where the drawing calls for it we work to ISO 286 IT6–IT8, and on milled features we have held ±0.002 mm. Tell us which dimensions are critical and we will say honestly whether we can hold them before you place the order.
Do you have a minimum order quantity?
No. We machine single prototypes and runs of several thousand. The price per part changes; the process does not.
How fast is a quote, and how fast are parts?
Quotes go out within 16 hours, usually the same working day. Typical lead time is 7–15 working days depending on quantity, finish and material availability. Rush lead times can be quoted if you need one.
You are not ISO 9001 certified — why should I trust the parts?
Because you see the measurements. Every first article is inspected on a CMM with a Renishaw PH10M head and you get the report as a PDF before the rest of the run is cut. If a dimension is out, we remake or credit it within 14 days of delivery. We would rather show numbers than a certificate.
Will you sign an NDA before I send drawings?
Yes, and we prefer it. Send your own NDA or ask for ours. Files are seen only by the engineer who quotes them and the programmer who runs them, and nothing appears on this website without your written permission.
Do you machine 5-axis parts?
No. We run two-, three- and four-axis machining centres. Many parts that look like 5-axis work can be machined in two or three setups on a four-axis machine — if yours genuinely needs simultaneous 5-axis, we will tell you rather than take the job.
Can you do assembly and finishing as one order?
Yes. Machining, sheet metal, finishing and simple assembly happen in the same building and arrive on one invoice, so you are not coordinating three suppliers and three shipments.
How do parts get to me, and who pays duty?
DHL, FedEx or UPS door to door with tracking, or your own freight forwarder. Commercial invoice and HS codes travel with every shipment. DDP can be quoted if you would rather we handle duties and brokerage up front.
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