High Precision CNC Precision Machining

On multi-axis work the hidden cost is verification time. Every additional rotary axis multiplies the collision cases that have to be simulated before the programme is released, so geometry that forces the head into an awkward attitude is expensive even when it cuts quickly. Where a feature can be reached with the head upright, leaving it upright is worth real money.

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.

Who is on the other side of the purchase order?

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.

How much capacity sits behind it?

a floor of 100-plus machines with depth in every relevant family, 50+ three-axis, 20+ four-axis, 20+ five-axis, 25+ turning centres, plus Swiss-type, grinding, and wire EDM.

Which geometries justify multi-axis machining?

Parts whose critical surfaces are curved or whose features are distributed around more than one datum.

Rates rise with axis count, but the saving appears in fixture count and in the number of times a part is handled.

The honest boundary of multi-axis machining

More axes means more collision cases to verify offline. Simulation is not optional, and that verification time belongs in the quote.

This boundary is stated deliberately. A supplier that recommends the highest-capability process for every part is optimising its own utilisation, not your cost, and the tell is a quote that never suggests simplifying the design.

Which standards the plant is certified to

Three certificates, each with a number you can check with the registrar: ISO 9001:2015 (116024/A/0001/UK/En), IATF 16949:2016 (131941/A/0001/SM/En), and ISO 14001:2015 (116024/B/0001/UK/En).

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.

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, fixed for each feature at the quote.

High-precision CNC precision — the discipline above standard precision

"High-precision" is the tier above standard precision, and adds three disciplines to the standard ±0.003 mm / ±0.002 mm tolerance band: a temperature-controlled inspection room at 20 ±1 °C with calibrated HVAC (aluminum grows 23 µm/m/°C — a 100 mm part at ±1 °C is ±2.3 µm, at ±5 °C is ±11.5 µm), a gauge at 10× the tolerance band per ANSI B89 (a ±0.003 mm feature requires a gauge at ±0.0003 mm), and Cpk reporting on every key characteristic (Ppk ≥ 1.67 on the FAI, Cpk ≥ 1.33 in production, with the σ algorithm stated). The tolerance bands: ±0.003 mm on milling above 10 mm, ±0.002 mm on turning, ±0.002 mm on grinding, ±0.001-0.002 mm on wire EDM. The inspection equipment: Hexagon CMM with 10:1; vision system for features below 1 mm; profilometer; hardness tester; XRF. The high-precision premium: 20-40 percent on inspection time and 5-15 percent on unit price over standard precision.

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.

High-precision tolerance band selection — where to tighten

The tolerance band selection on a high-precision part is the decision that decides whether the part costs $50 or $500. The rule: tighten only the functional features (mating, sealing, locating), leave the structural features at standard (±0.05 mm or wider per ISO 2768 medium). The functional features are typically 10-30 percent of the part's dimensions; tightening all dimensions to ±0.003 mm pays 5-10× on inspection for no value on the 70-90 percent that does not need it. The functional feature matrix: mating surfaces (the bore that fits a bearing holds ±0.003 mm on diameter and ±5 µm on cylindricity); sealing surfaces (the face that holds pressure holds 0.025 mm flatness and Ra 0.8 µm); locating features (the dowel pin hole holds ±0.003 mm on position); thread features (the tapped hole holds 6H per ISO 6H); gear features (the pitch holds ±5 µm, the profile holds ±0.003 mm).

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.

The high-precision inspection equipment list — five instruments

A high-precision CNC precision shop's inspection equipment list is five instruments: (1) Hexagon CMM with 10:1 measurement-to-tolerance per ANSI B89; (2) vision system for small features below 1 mm; (3) profilometer for surface finish (Ra, Rz, Rq); (4) hardness tester (Rockwell, Brinell, Vickers) for material state; (5) XRF (X-ray fluorescence) for chemistry verification on incoming stock. The temperature-controlled room: 20 ±1 °C with calibrated HVAC (aluminum grows 23 µm/m/°C — a 100 mm part at ±1 °C is ±2.3 µm, at ±5 °C is ±11.5 µm). The gauge R&R study: each gauge's repeatability and reproducibility verified at below 10 percent of the tolerance band per AIAG MSA 4th edition.

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.

De-risking a first order

A trial order of a few pieces is the cheapest insurance you can buy — it proves the routing, the tolerance and the paper trail on a small batch before the volume order locks in. One floor, one quality system, one accountable party, whether the run is a single part or a full production lot, so what the trial confirms is what production repeats.

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.

High Precision CNC Precision Machining — Related Pages

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