Swiss Type CNC Precision Machining

Swiss-type turning is bounded by bar stock, so the design lever is specifying a bar diameter that is commercially available rather than a nominal one, and keeping length-to-diameter within what the guide bushing can support. Very small features on a long part are the expensive case, because they need a long, slender tool at the far end of the part.

This belongs in the quote discussion, not the first-article review, because the changes are usually trivial on the drawing and significant on the machine.

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.

Which entity is responsible for the work?

Dongguan Zhuohang Ltd (Registration No. 91441900MA4UWT6X39, established 2005).

Which geometries justify swiss-type?

Long, slender parts: shafts, pins, spindles, bone screws, connector contacts, and watch components.

Fast cycle times and no second operation, but the bar stock must be held to tight diameter tolerance, which adds a small material premium.

Where does swiss-type stop paying?

Bar-fed only, so it is bounded by bar diameter and by the material that can be supplied as bar.

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.

How much of the floor is in this 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 over a hundred 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.

Depth in the same 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.

What do the certificates actually cover?

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: we cut to the drawings you provide, it does not originate the design.

Swiss-type CNC precision — the slender-shaft discipline

Swiss-type turning is the process class where the bar stock feeds through a sliding headstock and the tool cuts just in front of a guide bushing, and wins on slender shafts (L/D above 3:1) where conventional turning deflects. On a 10:1 slender shaft, a conventional lathe deflects 0.05-0.10 mm under the tool; a Swiss-type (TSUGAMI B0206-III, STAR SR-32J Type N, Citizen Cincom A20-3F7) holds ±0.002 mm because the guide bushing supports the bar 0.5-1.0 mm from the cutting point. The tolerance payoff: ±0.002 mm on diameter, ±0.003 mm on length, surface Ra 0.4-0.8 µm, concentricity at 2-3 µm. The lead-time payoff: Swiss-type runs bar stock from a magazine at 30-90 seconds per piece for a 5-mm shaft (conventional lathe 3-6 minutes). On a 1,000-piece lot, Swiss-type cuts 50-100 hours. The sub-spindle back-working removes the second-end re-clamp. Where Swiss-type is wrong: on a shaft below 3:1; on a block; on a part above 32 mm diameter.

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.

Swiss-type bar capacity and magazine loading

The Swiss-type machine's bar capacity is typically 32-38 mm diameter (TSUGAMI B0206-III, STAR SR-32J Type N, Citizen Cincom A20-3F7); above that a fixed-head lathe is the right machine. The magazine loading: the Swiss-type runs bar stock from a magazine that holds 3-6 meters of bar, so the operator loads once per 50-200 pieces (depending on the part length). The 24/7 unattended discipline: a Swiss-type with a magazine and a bar feeder runs 24/7 with one crew; the cycle time per piece is 30-90 seconds for a 5 mm shaft. On a 1,000-piece lot of slender shafts, the Swiss turning cuts 50-100 hours of cycle time vs the conventional lathe. The sub-spindle back-working: the part is cut on the main spindle, transferred to the sub-spindle for the second-end work, all in one setup — the concentricity between ends is held at 2-3 µm.

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.

Swiss-type applications — the slender-shaft geometry list

Swiss-type routing on TSUGAMI B0206-III / B0205-III, STAR SR-32JII / SR-32J Type N, Citizen Cincom A20-3F7 is the right answer for slender shafts (L/D above 3:1) where conventional turning deflects. The applications: medical pins (orthopedic, dental), dental implants (the slender thread and the hex drive), watch components (pinions, staffs, winding stems), fuel injector nozzles (the slender needle and the spray orifice), aerospace fittings (fuel system pins, hydraulic valve spools), electronic pins (test probes, connector pins). The tolerance payoff: ±0.002 mm on diameter (the guide bushing supports the bar 0.5-1.0 mm from the cutting point, eliminating deflection); ±0.003 mm on length; surface Ra 0.4-0.8 µm; concentricity between turned features at 2-3 µm.

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.

Swiss Type CNC Precision Machining — Related Pages

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