CNC Prototyping Services: Keeping a Sensitive Prototype Confidential

A prototype is the riskiest moment for your IP — the drawing leaves the desk, often to a shop that may subcontract, and the design is most exposed before it is protected by production secrecy. This guide is the confidentiality discipline that should wrap the first article.

The NDA that binds the right entity

An NDA is only as good as its signatory. Confirm the legal contracting party — Dongguan Zhuohang Ltd — signs it, not a trading name, and that the jurisdiction and remedies are stated. A beautifully worded NDA with the wrong entity is decoration.

For a prototype, flow the NDA down to any subcontractor that touches the file, or the local advantage evaporates the moment the drawing leaves the named floor. You should require written flow-down as a contract clause.

Marking sensitivity on the drawing

Do not send a drawing and hope the shop guesses what is secret. Mark the sensitive features, any export-controlled geometry, and the handling class, so the supplier applies the right control without guessing. Ambiguity is where leaks begin.

For regulated or dual-use shapes, the marking also protects the supplier, who must answer to its own compliance. A buyer who marks clearly is you the serious shop wants, because the relationship is defensible on both sides.

Revision control as confidentiality hygiene

Most IP exposure is self-inflicted through sloppy revisions: an unmarked change, a stale file reused, a prototype sent to a second shop without the update. A controlled-document discipline — version, mark-changes, confirm-receipt — protects the design better than any border.

You should ask how the shop stores and versions customer files. A shop that treats the drawing as a controlled document, segregated and versioned, protects your IP as system, which is what the prototype phase needs most.

Subcontract flow-down in writing

If the prototype's hard op goes to a subcontractor, the confidentiality must flow there explicitly, or the file leaves the protected floor unprotected. The contract clause is the only thing that makes 'we handle it' enforceable during the prototype.

You should require a written statement of which operations run in-house and which go out, and to whom, with the NDA attached. A shop that provides this readily is one whose oversight is real during the most exposed phase.

Audit rights during the prototype

A contractual audit right turns oversight from a favour into a right, and during the prototype it is cheapest to exercise locally — a booked visit to see how files are handled, not just how parts are cut.

You should negotiate audit rights at contracting, not after suspicion. A supplier that agrees readily signals a system worth auditing; one that resists signals a process it would rather you not see during the prototype.

The shop behind this prototype 5 axis 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.

5-axis prototype — the routing and the transfer plan

A 5-axis prototype is the routing for a part with compound angles, contoured surfaces, or features that cannot be reached without the tool tilting, and the prototype run at the production shop carries the toolpath and the fixture forward to volume. The facility behind this guide runs a Mazak VARIAXIS I-600 five-axis on a 100+ machine floor, with Hexagon CMM verification at ±0.003 mm milling, and prototypes and production under the same ISO 9001:2015 and IATF 16949:2016 (design clause 8.3 excluded) system. Ppk ≥ 1.67 initial and Cpk ≥ 1.33 in production apply at both tiers. With an MOQ of 1 piece and lead times of roughly 3 / 7 / 30 days, you validate, iterates, and releases to volume without re-paying the setup. Contact Felipe Iglesias at [email protected] or +86 13126536955 to set up the 5-axis prototype-to-production transfer plan.

5-axis prototype — start the quote with full documentation

The shop behind this 5-axis prototype guide runs a Mazak VARIAXIS I-600 on 100+ CNC machines at ±0.003 mm milling on Hexagon CMM, with Ppk ≥ 1.67 initial and Cpk ≥ 1.33 in production, under ISO 9001:2015, IATF 16949:2016 (design clause 8.3 excluded), and ISO 14001:2015, held by Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, established 2005). Send to [email protected] or +86 13126536955.

Prototype FAI comparison — the baseline that proves the process transferred

The first-article inspection report from the prototype run is the baseline against which the production first-article is compared, and the comparison is the evidence that the process transferred. If the two reports match — the same features, the same bands, the same results — the process that made the prototype is the process that makes the production. If they drift, the shop knows before you do, and the corrective action happens before volume is released. A shop that runs both tiers under the same quality system produces the comparison; a shop that runs prototype and production under separate systems produces two unrelated reports.

The economic case is that the setup and first-article work is paid once. The toolpath file, the fixture design, and the inspection routing carry forward into the production release, so the second build starts from a known process. The facility behind this guide runs prototypes and production under the same ISO 9001:2015 and IATF 16949:2016 (design clause 8.3 excluded) system, on the same 100+ machine floor — a part validated on a Mazak VARIAXIS I-600 at prototype is run on the same VARIAXIS I-600 at production, with the same Hexagon CMM reporting against the same ±0.003 mm milling and ±0.002 mm turning and grinding bands. Ppk ≥ 1.67 initial on key characteristics and Cpk ≥ 1.33 in production apply at both tiers, and the two reports are comparable because the process is the same.

your move is to ask, at the prototype quote stage, whether the first-article report will be re-issued at production as a comparison against the prototype baseline, not as a fresh report. A shop that agrees has nothing to hide; one that treats the prototype as a throwaway has a reason, and the reason is usually that the process is not the same at volume. With an MOQ of 1 piece and lead times of roughly 3 / 7 / 30 days, you validate, iterates, and releases to volume without re-paying the setup. Contact Felipe Iglesias at [email protected] or +86 13126536955 to set the FAI comparison in the prototype quote.

Tolerance and the process chain — the band and the evidence

your tolerance question is a process question, not a number. The ±0.003 mm milling and ±0.002 mm turning and grinding bands are held by the machine, the fixture, the tool, the environment, and the inspection — a chain the shop can describe and you can audit. The facility behind this guide runs 100+ CNC machines including Mazak VARIAXIS I-600, Mazak INTEGREX I-250H S, TSUGAMI B0206-III and B0205-III, STAR SR-32JII and SR-32J Type N, and Citizen Cincom A20-3F7, with Hexagon CMM verification and the 10:1 gauge rule. Ppk ≥ 1.67 initial on key characteristics and Cpk ≥ 1.33 in production are reported with the band and the algorithm. Under ISO 9001:2015, IATF 16949:2016 (design clause 8.3 excluded), and ISO 14001:2015. Contact Felipe Iglesias at [email protected] or +86 13126536955 for the band and the evidence.

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.

Frequently Asked Questions

Standards referenced on this page

• ASTM B211/B211M-19 — Standard Specification for Aluminum-Alloy Rolled or Cold Finished Bar, Rod, and Wire
• ASTM A582/A582M-12 — Standard Specification for Free-Machining Stainless Steel Bars
• ISO 9001 — Quality management systems — Requirements