- ISO 9001:2015 / IATF 16949:2016 / ISO 14001:2015, certificate numbers published and verifiable.
- Manufacturing to your print: the plant cuts to your design and reports against your drawing.
- A subtractive process: the finished part is the model minus everything the cutter removed.
- Cost is decided at the manufacturability review, before the first chip.
- No minimum order — prototype and production run on the same machines.
So what is CNC precision machining?
The process is subtractive: a rotating cutter removes material from a solid block or bar under numerical control, following a toolpath generated from a 3D model. The part that comes off the machine is the model minus everything the cutter removed.
What the term does not cover is the harder half of the answer — whether the part can be made at all, and at what cost. Those depend on tool access, datum structure, and the tolerance scheme on the drawing, none of which are visible in the model.
How do you tell whether a CNC precision machining 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.
What design decisions move the cost on CNC precision machining?
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 should come up when quoting, before any metal is cut, because the changes are usually trivial on the drawing and significant on the machine.
What identifies the legal entity behind the machines?
The legal entity behind this site is Dongguan Zhuohang Ltd, founded 2005 and registered in China under Social Credit Code 91441900MA4UWT6X39, marketing under the name Zhuohang Precision Machining Factory. Its registered and production address is No. 8, Shuibian Songyuan Road, Hengli Town, Dongguan, Guangdong, China 523470.
Use the National Enterprise Credit Information Publicity System and the 18-character code to verify a Chinese manufacturer. Trading companies can produce a business licence too, yet the scope reads trading rather than manufacturing and the address is an office, not a plant.
What capacity sits behind this?
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 more than 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 re-route rather than queue when a machine is pulled for service. That, not the headline machine, is what protects a delivery date.
Defining CNC precision machining in practical terms
Cnc precision machining is a subtractive process: a rotating cutter removes material from a solid block or bar under numerical control, following a toolpath generated from a 3D model. The part that comes off the machine is the model, minus everything the cutter removed.
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 on the week you need it, and re-route it when something breaks.
The sequence behind a finished part
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 CNC precision machining 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 someone has to actually write the first-article report.
What actually goes wrong, and how is it prevented?
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 is the certification position?
ISO 9001:2015, IATF 16949:2016 (excluding clause 8.3 product design), and ISO 14001:2015 — each with a certificate number verifiable with the registrar.
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, set feature by feature when we quote.
Cost structure of CNC precision — the five buckets
The price of a CNC precision part is five cost buckets that scale differently. NRE — 15-25 percent: covers programming, fixturing, FAI, tool prep, gauge R&R. At 5 pieces $200-800 per part; at 1,000 pieces $0.20-0.80 per part. Setup — 10-20 percent at prototype volume: a 4-hour setup at $35/hour (China) is $140; at 5 pieces $28 per part, at 1,000 pieces $0.14 per part. Programming — 5-15 percent at prototype volume: 3-axis 2-4 hours at $35/hour = $70-140; 5-axis 4-8 hours = $140-280; Swiss-type 6-12 hours = $210-420. Material — 10-30 percent: aluminum 6061 $4-8/kg, stainless 303 $6-10/kg, titanium Grade 5 $40-70/kg, Inconel 718 $80-120/kg. Machine time — 30-50 percent at prototype volume: China machine-hour rate 3-axis $25-50, 5-axis (Mazak VARIAXIS I-600) $45-80, Swiss-type $40-80. The four cost levers: stock material, vise-friendly geometry, standard tolerance where the part allows, lot size that amortises setup.
The shop: Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, established 2005, 6,800 sqm floor, 100+ staff, 100+ machines including Mazak VARIAXIS I-600 5-axis, INTEGREX I-250H S mill-turn, TSUGAMI B0206-III / B0205-III, STAR SR-32JII / SR-32J Type N, Citizen Cincom A20-3F7 Swiss-types, Hexagon CMM with 10:1 measurement-to-tolerance per ANSI B89, temperature-controlled inspection room at 20 ±1 °C, 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). Tolerance: ±0.003 mm milling, ±0.002 mm turning, ±0.002 mm grinding, Ppk ≥1.67, Cpk ≥1.33. Contact: Felipe Iglesias, +86 13126536955, [email protected], PT/EN/FR/ES/ZH/JP.
Hidden cost drivers — where CNC precision pricing hides its premium
Beyond the five cost buckets (NRE, setup, programming, material, machine time), three hidden drivers push the CNC precision part's price up. (1) Bundled NRE: when NRE is in the unit price, 30-50 percent of the cost is hidden — you pay it again on the next order. (2) Material at 2× mill price: a shop that does not pass through the mill cert's price is one whose material cost is whatever the shop chooses. (3) Hourly rate that does not match the machine class: a 3-axis VMC at $50/hour (a 5-axis rate) is overpriced; a 5-axis at $30/hour (a 3-axis rate) is honest. Your filter: ask for NRE separated from unit price; ask for the mill cert's price; ask for the machine-hour rate by axis count. A shop that produces all three is one whose pricing is anchored to reality; one that refuses is one whose pricing is whatever the shop chooses.
The shop: Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, established 2005, 6,800 sqm floor, 100+ staff, 100+ machines, Mazak VARIAXIS I-600, INTEGREX I-250H S, TSUGAMI B0206-III, STAR SR-32J Type N, Citizen Cincom A20-3F7, Hexagon CMM with 10:1, 20 ±1 °C, ISO 9001:2015 116024/A/0001/UK/En, IATF 16949:2016 131941/A/0001/SM/En, ISO 14001:2015 116024/B/0001/UK/En). Tolerance: ±0.003 mm milling, ±0.002 mm turning, Ppk ≥1.67, Cpk ≥1.33. Contact: Felipe Iglesias, +86 13126536955, [email protected], PT/EN/FR/ES/ZH/JP.
Hidden cost drivers — where CNC precision pricing hides its premium
Beyond the five cost buckets (NRE, setup, programming, material, machine time), three hidden drivers push the CNC precision part's price up. (1) Bundled NRE: when NRE is in the unit price, 30-50 percent of the cost is hidden — you pay it again on the next order. (2) Material at 2× mill price: a shop that does not pass through the mill cert's price is one whose material cost is whatever the shop chooses. (3) Hourly rate that does not match the machine class: a 3-axis VMC at $50/hour (a 5-axis rate) is overpriced; a 5-axis at $30/hour (a 3-axis rate) is honest. Your filter: ask for NRE separated from unit price; ask for the mill cert's price; ask for the machine-hour rate by axis count.
The shop: Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, established 2005, 6,800 sqm, 100+ staff, 100+ machines, Mazak VARIAXIS I-600, INTEGREX I-250H S, TSUGAMI B0206-III, STAR SR-32J Type N, Citizen Cincom A20-3F7, Hexagon CMM 10:1, 20 ±1 °C, ISO 9001:2015 116024/A/0001/UK/En, IATF 16949:2016 131941/A/0001/SM/En, ISO 14001:2015 116024/B/0001/UK/En). Tolerance ±0.003 mm milling, ±0.002 mm turning, Ppk ≥1.67, Cpk ≥1.33. Felipe Iglesias +86 13126536955 [email protected] PT/EN/FR/ES/ZH/JP.
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). Intended for 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). Intended for 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). Intended for 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). Intended for shafts, bushings, flanges up to ±0.002 mm.
- Wire EDM (5+) - Sodick AQ535L (550/350/300 mm travel, ±20° taper, 800 kg workpiece). Intended for 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.
Get a quote with the cost drivers named
Send your drawing to [email protected] or call +86 13126536955. We will tell you which tolerance or setup is driving the number, not just the number.
Frequently Asked Questions
What is the difference between cnc precision machining 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.
What files do you need for a quote?
Send a 3D model (STEP or IGES) plus a 2D drawing that names the tolerances, surface finishes, material spec and any inspection or certification needs. The drawing is the contract; the model alone typically leaves the tolerance scheme open.
How long does cnc precision machining 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.
Can you work to ASME Y14.5 as well as ISO?
Yes. Both geometric dimensioning conventions are used. The important thing is that the drawing states which one applies, because a single symbol is not interpreted identically under the two standards.
Do you hold stock or consignment for repeat orders?
On repeat orders, a forecast lets the shop hold material and, where justified, dedicated fixturing in readiness. It is a commercial arrangement rather than a standard term, worth raising at order two rather than order one.
Is your IATF 16949 certificate valid for design work?
No — clause 8.3 (product design) is excluded. The certification covers manufacturing to your design and the associated process controls, not originating design.
What materials do you machine?
Aluminum, stainless steel, titanium, brass, copper, and Inconel for metals; PEEK and Delrin (POM) for plastics. Material certificates are verified on incoming stock.
Standards referenced on this page
- ASTM A582/A582M-12 — Standard Specification for Free-Machining Stainless Steel Bars
- ASTM B211/B211M-19 — Standard Specification for Aluminum-Alloy Rolled or Cold Finished Bar, Rod, and Wire
- ISO 9001 — Quality management systems — Requirements