The shop behind this work guide — verified and quotable in one exchange
This guide's facility holds 100+ CNC machines across a 6,800 m² plant at No. 8, Shuibian Songyuan Road, Hengli Town, Dongguan, Guangdong, China 523470. Machines include the Mazak VARIAXIS I-600 five-axis, INTEGREX I-250H S mill-turn, TSUGAMI B0206-III/B0205-III and STAR SR-32JII / SR-32J Type N Swiss lathes, Citizen Cincom A20-3F7, 3-, 4- and 5-axis milling and turning centres, 5+ Sodick AQ535L wire EDM machines and a Hexagon CMM bench with 20+ gauges.
Tolerances held: ±0.003 mm milled, ±0.002 mm turned, and ±0.002 mm ground or wire-cut, verified on a Hexagon CMM with the 10:1 gauge rule on every feature. Capability indices: Ppk ≥ 1.67 initial, Cpk ≥ 1.33 in production, on key characteristics. Certifications: ISO 9001:2015 (116024/A/0001/UK/En), IATF 16949:2016 (131941/A/0001/SM/En, design clause 8.3 excluded, disclosed openly), ISO 14001:2015 (116024/B/0001/UK/En), issued to Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, established 2005). Service area: Austria, Belgium, the Czech Republic, Denmark, France, Germany, Greece, Hungary, Ireland, Italy, the Netherlands, Spain, Sweden and the United Kingdom in Europe; Brazil, Canada, Mexico and the United States in the Americas; China, Israel, Japan, Singapore and Sri Lanka in Asia; Australia and New Zealand in Oceania; and South Africa in Africa — based in China, delivering worldwide. Email Felipe Iglesias at [email protected] or +86 13126536955 to open a quote, and request the certificate numbers, the machine list and a past CMM report in the same message.
Verifying the supplier — entity, certificates, and floor in one exchange
your decision on a CNC supplier runs through three checks, and each check is verifiable in minutes. The first is the legal entity — the Unified Social Credit Code, 18 digits, verifiable on the National Enterprise Credit Information Publicity System. Dongguan Zhuohang Ltd, USCC 91441900MA4UWT6X39, established 2005, is the entity behind this guide, and the registration is a lookup, not a scan. The second is the certification set — ISO 9001:2015 (116024/A/0001/UK/En), IATF 16949:2016 (131941/A/0001/SM/En, design clause 8.3 excluded — disclosed openly), and ISO 14001:2015 (116024/B/0001/UK/En), held by the same entity and verifiable with the registrar URS. The third is the floor — 100+ CNC machines on a 6,800 m² plant at No. 8, Shuibian Songyuan Road, Hengli Town, Dongguan, including Mazak VARIAXIS I-600 five-axis, Mazak INTEGREX I-250H S mill-turn, TSUGAMI B0206-III and B0205-III, STAR SR-32JII and SR-32J Type N, and Citizen Cincom A20-3F7, verified on a live video walk-through.
The tolerance bands held — ±0.003 mm on CNC milling, ±0.002 mm on CNC turning, ±0.002 mm on precision grinding and wire EDM — are the bands the quote is written against, and the Hexagon CMM reports the dimensional result against the band with the 10:1 gauge rule applied to every feature. The capability indices — Ppk ≥ 1.67 initial on key characteristics, Cpk ≥ 1.33 in production — are reported with the band, the subgroup count, the sampling window, and the sigma algorithm stated alongside the index. A capability index without the band and the algorithm is a number that cannot be checked; the facility behind this guide reports all four. The service area spans Austria, Belgium, the Czech Republic, Denmark, France, Germany, Greece, Hungary, Ireland, Italy, the Netherlands, Spain, Sweden and the United Kingdom in Europe; Brazil, Canada, Mexico and the United States in the Americas; China, Israel, Japan, Singapore and Sri Lanka in Asia; Australia and New Zealand in Oceania; and South Africa in Africa — based in China, serving customers worldwide. Your move is to ask for all three checks in one email — the entity, the certificates, and a past CMM report — and a real manufacturer supplies all three. Contact Felipe Iglesias at [email protected] or +86 13126536955.
- 6,800 m² across two buildings in Hengli Town, Dongguan — production, inspection, and engineering under one roof.
- ISO 9001:2015 / IATF 16949:2016 / ISO 14001:2015 — certificate numbers published and verifiable.
- A subtractive process: the finished part is the model minus everything the cutter removed.
- Cost is set at the manufacturability review, before the first chip.
- No minimum order — prototype and production run on the same machines.
How do you choose between suppliers?
The distinction that matters commercially is between having the capability and having the depth. A plant with one machine in a family can make the part; a plant with twenty can make it in the week you need it, and re-route it when something breaks.
Four checks resolve most of the question before any commitment: a registration number that resolves to a real entity, machine families and counts named rather than photographed, certificate numbers a registrar can confirm, and an address you can walk — on site or by video.
How do you tell whether a machining services supplier actually runs it?
These four checks cost nothing and can be run before any commitment.
- Can they name the registration number? Ours is 91441900MA4UWT6X39, check it in the National Enterprise Credit Information Publicity System.
- Do they name machine families and counts? A manufacturer lists models; a reseller recycles stock photos.
- Are the certificate numbers verifiable? Real ISO/IATF certificates carry numbers you can confirm with the registrar.
- Can you walk the floor? On-site and video audits are welcome at the Dongguan address.
Three things that change the price without changing the part
Three design decisions drive most of the cost on a machined part: internal corner radii matched to a real cutter diameter, cavity depth kept within about four times the tool diameter, and a general tolerance on every feature that does not mate. Each one changes the tool that can be used, and the tool determines how much material can be removed per minute, which is why these matter more than any process selection.
This is worth raising at quote stage rather than after the first article, because the changes are usually trivial on the drawing and significant on the machine.
Depth in the relevant machine family
Total machine count is not the question — the question is how many machines sit in the family that makes your part, because that is the queue your part waits in. The floor runs 100+ machines: 50+ three-axis centres for prismatic work, 20+ four-axis, 20+ five-axis, 25+ turning and mill-turn centres, Swiss-type lathes for long slender parts, precision grinding and wire EDM for the tightest features.
The spare capacity in that family is what lets a part send work to a free machine instead of letting it wait when a machine is pulled for service. That, not the headline machine, is what protects a delivery date.
What the certificates cover, line by line
Three certificates, each with a number you can check with the registrar:
| Standard | Certificate number | Scope note |
|---|---|---|
| ISO 9001:2015 | 116024/A/0001/UK/En | Quality management system |
| IATF 16949:2016 | 131941/A/0001/SM/En | Automotive QMS. Excludes clause 8.3 product design |
| ISO 14001:2015 | 116024/B/0001/UK/En | Environmental management system |
The IATF 16949 certificate excludes clause 8.3 (product design). That is normal for a build-to-print manufacturer and it is stated here rather than left for an auditor to discover: the shop builds to the design you supply, it does not originate the design.
How does the process actually run, step by step?
The sequence is quoting and manufacturability review, then programming and offline verification, then fixturing, then roughing, then finishing, then inspection and first-article reporting. Every step can go wrong in its own way, and the costly failures sit at the start and the end.
The manufacturability review is where cost is actually decided. A pocket depth reduced by a few millimetres, or an internal corner radius opened from 1 mm to 3 mm, can cut cycle time more than any change of machine, because it changes the tool that can be used, and a stiffer tool removes more material per minute.
What does machining services cost, and what drives it?
Cost is driven by setup time amortised over quantity, cycle time, material and tooling, inspection labour, and the risk premium on the tolerance. On a prototype the setup dominates; on a production run the cycle time does. That is why a per-part price without a quantity is not a price.
The driver buyers most often underestimate is inspection. A drawing that calls out twenty dimensions has a different inspection cost from one that calls out five, and a first-article report has to be authored, not assumed.
What fails on this process, and when
The failures that cost money are not crashes — they are the quiet ones: a tolerance held on the machine but lost in a later operation, a revision built from a superseded drawing, and a surface finish callout that meant something different in another standard.
Each has a cheap control. Datum structure is reviewed at quote stage; the revision is confirmed in writing on the order acknowledgement; the drawing standard is confirmed when the files arrive. None of these controls cost anything, which is what makes their absence inexcusable.
What tolerance applies?
±0.003 mm on CNC milling, ±0.002 mm on CNC turning; ±0.002 mm where precision grinding or wire EDM is used, agreed per feature during quoting.
Which entity is responsible for the work?
Dongguan Zhuohang Ltd (Registration No. 91441900MA4UWT6X39, established 2005).
What this shop actually runs
If you ask for capability evidence, you deserve a specific answer. This facility operates 100+ CNC machines across 6,800 m2 in Dongguan, China, staffed by 100+ people. The machines, listed by category:
- 5-axis machining centres (10+) - Mazak VARIAXIS I-600 (510/910/510 mm travel, 12,000 rpm, 22 kW, 71.6 N·m, 30-tool BT40) and Mazak INTEGREX I-250H S (B-axis 0.0001°, 24 kW, 124 N·m, 38-tool HSK-A63). Used on compound-angle parts, single-setup multi-face prismatic work, and aerospace fittings where datum transfer loss is unacceptable.
- 3-axis / 4-axis machining centres (50+) - Brother SPEEDIO S500Z2N / S700Z2N (10,000 rpm, 14/21-tool ATC, 0.7 s tool-to-tool, Z-axis 2.2 G) and Mazak VCE-430A L / VCE-570C L (10,000 rpm, 118 N·m, 24-tool ATC). Used on prismatic parts, plates, brackets, housings.
- Swiss-type turning centres (10+) - Citizen Cincom A20-3F7 (Φ20 mm, 10,000 rpm), TSUGAMI B0206-III / B0205-III (Φ20 mm, 0.1 µm), STAR SR-32JII / SR-32J Type N (Φ32 mm, 8,000 rpm). Used on long, slender rotational parts at ±0.002 mm.
- CNC turning centres (20+) - HEADMAN T70M/1250 (720 mm swing, 117 mm bore, 3,000 rpm, BMT75 12-station turret). Used on shafts, bushings, flanges up to ±0.002 mm.
- Wire EDM (5+) - Sodick AQ535L (550/350/300 mm travel, ±20° taper, 800 kg workpiece). Used on hardened tool steel, internal splines, sharp internal corners that milling cannot reach.
- Inspection: Hexagon CMM + 20+ gauges - Hexagon CMM for coordinate measurement, plus vision system, profilometer, hardness tester, coating thickness gauge, XRF for material verification. The 10:1 rule (gauge 10x more accurate than the band) is applied to every feature.
- Machine highlights - VARIAXIS I-600: one-setup multi-face 5-axis + MAZA-CHECK auto-calibration; INTEGREX I-250H S: DONE-IN-ONE mill-turn, B-axis 0.0001° + Ai thermal shield; SPEEDIO S500Z2N / S700Z2N: Z-axis 2.2 G + 0.7 s ATC; Swiss-type: guide-bush switchable + 0.1 µm resolution.
Tolerance bands: ±0.003 mm milled, ±0.002 mm turned, ±0.002 mm ground or wire-cut. Capability indices: Ppk >= 1.67 at the initial study; Cpk >= 1.33 ongoing in production.
Certifications: ISO 9001:2015 (116024/A/0001/UK/En) · IATF 16949:2016 (131941/A/0001/SM/En, design clause 8.3 excluded) · ISO 14001:2015 (116024/B/0001/UK/En), held by Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, since 2005).
Service area: we supply Austria, Belgium, the Czech Republic, Denmark, France, Germany, Greece, Hungary, Ireland, Italy, the Netherlands, Spain, Sweden and the United Kingdom in Europe; Brazil, Canada, Mexico and the United States in the Americas; China, Israel, Japan, Singapore and Sri Lanka in Asia; Australia and New Zealand in Oceania; and South Africa in Africa, with worldwide delivery from China.
Contact: Felipe Iglesias, [email protected], +86 13126536955.
Not sure this is the right process?
Send the model and the drawing and get a straight answer on whether this route is the right one, including where a design change would cut cost. Reach Felipe Iglesias at [email protected] or +86 13126536955.
Frequently Asked Questions
What is the difference between a prototype build and a production build here?
Usually only quantity and scheduling. Both run on the same machines and the same process, which is what makes a later ramp a scheduling change rather than a re-qualification.
What tolerances can you hold?
In short, ±0.003 mm on CNC milling, ±0.002 mm on CNC turning, and ±0.002 mm where precision grinding or wire EDM is used. The achievable tolerance depends on geometry, material, and datum structure, so it is confirmed per feature at quote stage rather than assumed from a headline number.
How long does machining services take?
Lead time is driven less by cutting time than by queue position, fixture design, and inspection. A part that needs a purpose-built fixture has a longer first-article lead and a much shorter repeat lead, which is worth asking about separately.
What is the difference between machining services and similar process?
The practical difference is usually the number of setups and the resulting tolerance stack. Fewer setups means fewer datum transfers, and that is what determines whether a geometric relationship holds.
Do you sign NDAs before reviewing drawings?
Yes. Sign an NDA before files are exchanged; drawings are kept in the quoting system, not circulated by email.
Is inspection documentation included in the quote?
It should be stated explicitly. A first-article report is a real document that has to be written, and whether it is a full dimensional report or a sample plan changes both the cost and what you receive.
How are parts packed for export?
Each part is packed to spec — finished surfaces individually bagged and boxed, steel given corrosion protection. Packing belongs in the quote: it affects the cost and the condition the parts arrive in.
Continue reading: How Long Does Machining Services Take · How Much Does Machining Services Cost · Machining Services
Standards referenced on this page
- ASTM A582/A582M-12 — Standard Specification for Free-Machining Stainless Steel Bars
- ISO 14001 — Environmental management systems — Requirements with guidance for use
- IATF 16949:2016 — Automotive quality management system standard