Machining centre cutting a toleranced partphoto to come

Dongguan, China · machining since 2008

Precision parts, measured before they leave the shop.

Tight-tolerance CNC machining, wire and sinker EDM, and a measuring room with a Renishaw probe head — under one roof, in our own shop.

±0.002 mm achievable on milled features
First article measured on the CMM before the run continues
Dimensional report with actual values, as a PDF, on request

Send a drawing What we can hold

Hero photo to come

2008Machining since

40CNC machines

±0.002 mmAchievable milling accuracy

36People on site

4Engineers on staff

1 dayTypical quote turnaround

Capabilities

Six capabilities, and one honest exception

Pick one. Five of these happen entirely on our own machines in Dalingshan Town, Dongguan. The sixth — surface finishing — is only partly ours, and the panel says exactly which part.

MillingTurningWire EDMSinker EDMMeasuring roomFinishing

Machining centre cutting a toleranced pocketphoto to come

Milling

32 machining centres — 13 four-axis, 13 three-axis, 6 two-axis. This is where most toleranced work happens: bores, fits, seal faces, flatness.

±0.002 mm achievable on milled features
Unmarked dimensions to DIN ISO 2768-m
Part envelope up to roughly 800 × 600 × 500 mm
Aluminium, stainless, tool steel, titanium, brass, engineering plastics

CNC lathe cutting a shaftphoto to come

Turning

Eight CNC lathes for shafts, pins, bushings, adapters and sealing features, with second operations on the mill when the part needs them.

Turned diameters from 3 mm to 250 mm
Threads cut, not formed, where the drawing calls for it
Concentricity checked against the drawing datum

Wire EDM machine cutting a profilephoto to come

Wire EDM

Six wire EDM machines for shapes a cutter cannot produce — sharp internal corners, thin webs, and material already through heat treatment.

Sharp internal corners with no corner radius
Hardened steel cut after heat treatment
Profiles taken straight from DXF or STEP

Sinker EDM electrode over a cavityphoto to come

Sinker EDM

Six sinker EDM machines for blind pockets, keyways and cavities with no tool access. Electrodes are made here, on our own machines.

Blind features and square-bottomed pockets
Electrodes made in-house, on our own machines
Used mainly on hardened tool steel

Coordinate measuring machine with Renishaw PH10M probephoto to come

Measuring room

A coordinate measuring machine with a Renishaw PH10M probe head. Every production run starts here: the first part off the machine is measured before the rest is cut.

First-article inspection before the run continues
Report gives actual, nominal, upper and lower tolerance and deviation per feature
Delivered as a PDF — ask for it with the order
If a toleranced feature is out, you get a phone call, not a box of scrap

Tumbling machine with a batch of partsphoto to come

Finishing

Tumbling and deburring happen on our own two machines. Anodising, black oxide, plating, blasting, polishing and powder coating run at shops we work with — we organise it, and we tell you so you know where the part goes.

Tumbling (stone-wash) in-house, two machines
Anodising, plating, blasting, coating coordinated outside
One supplier, one invoice, one delivery

What we hold

The features people actually buy from us

Toleranced work is most of what runs here. These are the things that usually decide whether a part is accepted or sent back.

Fits and bores

Mark the fit on the drawing and it is measured on the CMM against that fit, not eyeballed with a caliper.

Seal faces and flatness

Faces that have to seal get measured for flatness against the drawing datum before the run continues.

Concentricity and runout

Turned and milled features on the same part are checked against the datum the drawing specifies.

Threads

Cut rather than formed where the drawing requires it, so the thread form matches what you specified.

Sharp internal corners

Where a cutter would leave a radius, the corner is cut on wire EDM instead.

Hardened material

Tool steel is machined after heat treatment on wire and sinker EDM, so the tolerance survives hardening.

Our shop

Forty CNC machines and thirty-six people, in one building

We started in 2008 and we have stayed a machine shop. Nobody here forwards your drawing to somebody else and adds a margin — the machines below are ours and the people running them are on our payroll.

32CNC machining centres — 13 four-axis, 13 three-axis, 6 two-axis
8CNC lathes for turned and threaded work
12EDM machines — 6 wire, 6 sinker, for hardened material and sharp corners
4Engineers on staff, who read the drawing before a price goes out

Shop floor — rows of machining centresphoto to come

Qty	Machine
32	CNC machining centres — 13 × 4-axis, 13 × 3-axis, 6 × 2-axis
8	CNC lathes
6	Wire EDM (WEDM)
6	Sinker EDM
4	Punching machines, plus forming and welding
2	Tumbling machines (stone-wash)
4	Engineers on staff

Materials

What runs here regularly

These move through the shop all the time. If your material is not on the list, that is not a no — ask.

Material no.	Designation	Also known as
3.3211	EN AW-6061 · AlMg1SiCu	AA 6061
3.2315	EN AW-6082 · AlSi1MgMn	AA 6082
3.4365	EN AW-7075 · AlZn5,5MgCu	AA 7075
3.3547	EN AW-5083 · AlMg4,5Mn0,7	AA 5083
1.4301	X5CrNi18-10	AISI 304
1.4404	X2CrNiMo17-12-2	AISI 316L
1.0038	S235JR	St 37-2
1.0570	S355J2	St 52-3
1.7225	42CrMo4	AISI 4140
1.2379	X153CrMoV12	AISI D2
2.0401	CuZn39Pb3	Ms58
2.0065	Cu-ETP	C11000
3.7035	Ti Grade 2	R50400
3.7165	TiAl6V4	Ti Grade 5

Engineering plastics

POM-CPA6PA66PEEKPTFEPCPMMAPETPPSPEI (Ultem)PVC / CPVCUHMW-PEABSPPHDPEPSUPPSUPAI

Material sourcing and certificates

Bar and plate come from suppliers in Guangdong. For EN 10204 3.1 certified material we order against the certificate and pass it through with the parts. Please state this with the enquiry — certified stock takes longer to arrive.

Surface finishing — tumbling is ours, the rest is coordinated

Anodising (clear / coloured / hard)Black oxidePlating (zinc, nickel, chrome)Sand and bead blastingBrushing and polishingPowder coatingLaser marking

Inspection & documents

What we measure, what you get on paper, and what we cannot give you

Read the right-hand column before you order. We would rather lose the enquiry than the order.

✓What you get

Achievable milling accuracy ±0.002 mm: on milled features — not on every feature of every part. Mark the tight ones on the drawing; without a mark we work to DIN ISO 2768-m.
First-article inspection, every production run: The first part is measured on the coordinate measuring machine before the rest of the run is cut. This is not an extra you order; it is how we work.
Dimensional report: Actual value, nominal, upper and lower tolerance and the deviation for each measured feature, tied to the part and the measuring programme it came from. PDF. Ask for it with the order — it does not happen automatically.
EN 10204 3.1 material certificate: on request, with batch / heat number, ordered against the certificate and passed through with the parts. Certified stock has a longer lead time, so say so with the enquiry.
An engineer's opinion before you commit: If a tolerance is tighter than the function needs, we say so. Loosening one dimension often costs less than the whole rest of the part.
Drawing and data confidentiality: Your files go to nobody outside the shop. NDA on request, before you send anything.

!What we do not have

No ISO 9001 certificate: We are not currently certified. No certificate does not mean unprofessional — it means you judge us by the part and the report, not by the binder. If your supplier approval requires the certificate, we would rather tell you now than after the order.
No EMPB to VDA Volume 2, no PPAP: We do not produce formal first-article reports in the automotive formats. A normal dimensional report you can have; those two you cannot.
No 5-axis simultaneous machining: Our centres are 2-, 3- and 4-axis. A part that genuinely needs simultaneous 5-axis work is not for us, and we will say so when we see the drawing rather than find out on the machine.

Measuring room — CMM with Renishaw PH10M probe headphoto to come

Sample dimensional report from the CMM softwarephoto to come

Process

How a job runs, start to finish

Six steps. No portal to sign up for, no account to open.

You send the drawing

STEP, IGES, X_T, DWG, DXF or PDF, with the quantity and the material.

Mark the tolerances that actually matter
Say if you need a certificate or a report

An engineer reads it

Four engineers on staff. Questions come back to you before a price goes out.

Features that will make the part expensive get flagged
Over-tight tolerances get questioned, not silently priced in

Quote

Price, lead time, and what is and is not included. Usually within one working day.

No account to open
No minimum order quantity

First article

The first part off the machine goes to the measuring room before anything else is cut.

Measured on the CMM against your drawing
Out of tolerance means a phone call, not a shipment

The run

Production continues once the first article is signed off, with in-process checks on the toleranced features.

Tumbling and deburring in-house
Outside finishing organised and tracked by us

Report and shipping

The dimensional report goes out as a PDF if you asked for it, with the parts.

DHL, FedEx or UPS on your account or ours
Or delivered to your forwarder in Shenzhen

Send the drawing. We will tell you what we can hold.

Price, lead time, and an engineer's opinion on the tolerances — usually back within one working day.

Request a quote Email us

FAQ

Questions we get asked

How tight a tolerance can you really hold?

±0.002 mm is achievable on milled features. That is a real number from our machines, not a brochure number — but it is achievable, not automatic, and it is not free on every feature of a part. Mark the dimensions that matter on the drawing and we will tell you with the quote whether we can hold them and what they cost. Anything unmarked we work to DIN ISO 2768-m.

What exactly is in the dimensional report?

One line per measured feature: the actual value we measured, the nominal from your drawing, the upper and lower tolerance, and the deviation. It is tied to the part number and to the measuring programme it came from, and arrives as a PDF. Ask for it with the order.

Is the first article measured on every job?

On every production run, yes — the first part off the machine goes to the measuring room before the rest is cut. What you have to ask for is the written report; the inspection itself happens either way.

Are you ISO 9001 certified?

No. We would rather say that on the homepage than have you discover it during supplier approval. What we have instead is a measuring room, first-article inspection before every run, and a report with actual values on request.

Do you machine hardened material?

Yes. Tool steel that has been through heat treatment is cut on wire and sinker EDM rather than milled, which is how the tolerance survives hardening. 1.2379 / AISI D2 and 1.7225 / 42CrMo4 run here regularly.

What is the minimum order?

There is none. A single prototype is a normal job. The unit price falls with quantity, but whether we take the work does not depend on it.

Who actually makes the parts?

We do, in our own shop in Dalingshan Town, Dongguan — the machine list on this page is our floor, not a partner network. The one exception is surface finishing: tumbling is ours, while anodising, plating, blasting and powder coating run at shops we work with. We organise that and it comes on one invoice, and we tell you so you know where your part goes.

Will you sign an NDA?

Yes, and before you send anything if you prefer. Either way your drawings and models go to nobody outside the shop.

Contact

Talk to us

Send the drawing and the quantity. If something is unclear we ask rather than guess.

Email: eileen@gymachining.com
Phone / WhatsApp: +86 137 9012 4916
Address: 2nd Floor, Hongfu Building, No. 45 Lianma Road,
Dalingshan Town, Dongguan, Guangdong 523129, China
Hours: Mon–Fri 08:00–23:00 Dongguan time (GMT+8)
Quote turnaround: Usually one working day