Swiss-type turning produces some of the smallest, most accurate parts a machine shop makes, and it produces them with equipment that is specific to the task: a sliding headstock that feeds the work through a guide bushing, a bar feeder behind it, and a spindle system built for long thin parts that would whip in a conventional lathe. Because the process is specific, the verification is specific too. A quality system certificate and a general machine list do not tell you whether a floor can hold your micro diameters or run your bar without stoppage. This guide walks the Swiss-specific checks that belong in front of a deposit: the machines, the bar and collet system, the small-feature metrology, the handling of tiny parts, and the evidence ladder built on all of it.
Why does a Swiss-type order need verification that a conventional turning order does not?
A conventional turning order is verified by asking whether the floor has a lathe that can swing the part and a process that holds the tolerance. A Swiss order has to be verified differently because the process is a system, not a single machine. The sliding headstock and guide bushing decide what lengths and diameters can run and how true they will be; the bar feeder decides whether the run is continuous or interrupted; and the collets decide whether the material is held without marking or slipping. Each element is a point of failure, and each is specific to the Swiss floor.
The scale changes the verification as well. A part that weighs grams and carries features in fractions of a millimetre fails for reasons a large part never encounters: a burr that a large part would shrug off, a micron of concentricity error that is a real percentage of the feature, a chip that lodges in a blind hole and never comes out. Verifying a Swiss supplier means asking how it handles those small-part realities, not just whether it has the machines. A Swiss shop that cannot discuss burr control and chip removal on small features is a shop that has not learned the lessons its own process teaches.
What machine specifics should I confirm before paying?
The machine list on a Swiss floor has to be read differently from a conventional one. Confirm the machine class you are being quoted on — the sliding-headstock type whose bar capacity and length envelope match your part — and check the numbers against the drawing: the maximum bar diameter must exceed the largest turned diameter, and the maximum part length must cover the longest unsupported section the design needs. Ask whether the machine carries a sub-spindle, because a part needing second-operation work on its back end can be completed in one machine only with one, and a part without a sub-spindle available runs as a transfer or a second machine.
The configuration details matter as much as the class. Ask how many axes the machine runs, whether the tooling stations cover the operations your drawing needs, and whether the machine is set up for the material family — some Swiss machines run free-cutting alloys beautifully and struggle with tougher grades. A live walk-through that shows the machine running, with the models read and the bar feeder loaded, converts each of these claims into an observation. A Swiss floor that demonstrates the machine that will run your part, configured for your type of work, is a floor whose quote you can trust; one that answers only in catalog terms is a floor whose capability is still a claim.
How do I verify that a Swiss shop can hold the tolerances my part needs?
Swiss machining is sold on its accuracy, and accuracy is provable only in data. Ask the shop for a past lot of a part comparable to yours — similar size, similar features, similar material — and read its report the way your inspector would. Do the diameters carry measured values, or are they ticked? Is the concentricity between features cut in different spindles measured and reported, or assumed? Are the roundness values centered in their tolerances, or running near the edge? The answers show whether the shop measures the features that matter on small parts or only the ones that are easy.
The report also tells you what inspection method the shop will apply to yours. A Swiss part's critical features are often too small for a general-purpose gage, so the measurement depends on the instrument: a vision system for tiny diameters, a CMM for position and concentricity, a roundness instrument for cylindricity on a micro journal. Ask which instruments the shop holds and which it used on the past lot, and match them against the callouts on your drawing. A shop whose past reports carry real small-feature measurements, taken with instruments appropriate to the size, is a shop whose tolerance claims can be checked on your order; one whose reports list only the easy diameters has not yet shown it can prove the hard half of its own work.
What role do the bar feeder and collets play in the verification?
On a Swiss machine the bar is the material, the workpiece, and often the schedule. The machine feeds bar through the guide bushing as it cuts, parts off the finished piece, and advances the next length, so a bar that does not run cleanly stops the whole process. Verify the bar diameter your part needs against the feeder capacity, confirm the grade is one the shop runs regularly, and ask whether the incoming bar lot is verified against its certificate before it loads. A bar that enters the feeder unverified enters every part it makes, and on a Swiss run that is a hundred or a thousand parts sharing one unverified story.
Collets are the quiet partner in the same story. The collet holds the bar as it feeds, and a collet that suits the material holds it without slipping or marking; one that does not produces run-out, feed inconsistency and surface damage that show up in the parts and never in the setup sheet. Ask what collet system the machine uses, whether the shop holds the collet sizes your bar needs, and how it manages the change between bar diameters on different runs. The bar feeder and collet system are where a Swiss run either flows or stumbles, and neither is visible in a unit price or a certificate — both are visible only when the floor is asked the right question.
What should the payment ladder look like on a first Swiss order?
A first Swiss order earns its payments the way any first order does, with evidence on every rung and Swiss-specific evidence in the middle. The deposit covers the bar and the setup, and it is the only money that moves before anything is cut. The middle tranche releases against the first-article report, and on a Swiss order that report has to carry the small-feature measurements your drawing calls critical — the diameters, the concentricity between main and sub-spindle features, the roundness on the journals, the finish on any sealing face. A first article that measures those features is proof the machine, the bar and the program produced what the drawing demands; a report that ticks its way around them is not proof of anything.
The balance releases against the completed documentation and the shipping release, as on any order, and your side of the ladder is the same discipline in a Swiss key: define the evidence in the purchase order before the deposit, so the report the middle tranche waits for is the report that was agreed at the start. The ladder on a Swiss order is not different in shape from any other — it is different in the content of its evidence. When the middle tranche is held for concentricity and roundness values rather than for a generic pass, the ladder has become Swiss-specific, and that is exactly what a Swiss order's quality gate should be.
Why do small parts need special attention in cleaning and packaging?
Swiss parts are small, and small parts fail in small ways that large parts never do. A burr left on a micro feature can jam the assembly the part fits into; a chip trapped in a blind hole can scratch a mating surface or fail a cleanliness requirement; and a part that weighs less than a gram is easy to lose, easy to mix, and hard to count by eye. Ask how the shop deburrs its small parts, how it cleans them after machining, and how it verifies that a blind hole is actually free of chips, because those steps are part of the delivered quality of a small part even though they appear on no drawing.
Packaging and counting belong in the same conversation. Ask how the shop protects small parts in transit — whether they are bagged by lot, separated to prevent surface contact, and counted by a method that does not rely on a tired eye — and how the packaging prevents a mixed lot from reaching your dock. A shop that treats small-part handling as a process, with named deburring and cleaning steps and a counting method, is a shop that understands what its parts actually are; one that treats a micro part like a large one with smaller dimensions will ship you the small part's failure modes. The handling conversation is one of the cheapest and most revealing checks in a Swiss sourcing audit.
The same attention should extend to how the shop samples and retains the small parts it produces. Ask whether a first article and a retention piece from the lot are kept until the order is accepted, because on a part that cannot be visually inspected, the retained sample is the physical reference your receiving team can hold against the shipment. Ask how long retention lasts and whether the retained pieces are labelled with the order, so that a dispute about a dimension or a surface three weeks after delivery can be settled against the actual article rather than against a memory of it. Small parts are cheap to retain and expensive to dispute, and the shops that retain them systematically are the ones whose quality disputes stay rare.
What paperwork should a Swiss turning lot ship with?
The shipping package of a Swiss lot is the record of the features that cannot be seen in the part. The bar certificate with its heat and the incoming verification tie the material to its story; the first-article report carries the measured micro features — the diameters, the concentricity, the roundness, the finish — and the lot summary confirms the run held what the first article proved. The certificate of conformity binds the package to the order. Every document should name the same order and the same bar heat, so the chain can be read backward from your receiving dock to the distributor's shelf.
The receiving check completes the audit. Measure a critical diameter and compare it to the report, run any thread or go/no-go gage the drawing requires, and confirm the lot count and the packaging match the documents before the parts enter your stock. A Swiss part's quality lives in measurements too small for the eye, which is why the paperwork and the receiving check carry the whole burden of proof. For how a Swiss floor is set up and measured, the quality page on this site shows the metrology, and the parts guide explains how small turned geometry carries its tolerances. A Swiss order verified on the machine specifics, the bar system, the micro metrology and the handling of small parts, with payments released against that evidence, is an order whose deposit was spent where it could be proven.
What this shop actually runs
Capability evidence should come as specifics, not slogans. Behind this guide is a 6,800 m2 plant in Dongguan, China running 100+ CNC machines with 100+ staff. The machine list 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). Aimed at 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). Aimed at 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). Aimed at 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). Aimed at shafts, bushings, flanges up to ±0.002 mm.
- Wire EDM (5+) - Sodick AQ535L (550/350/300 mm travel, ±20° taper, 800 kg workpiece). Aimed at 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: ±0.003 mm CNC milling / ±0.002 mm CNC turning / ±0.002 mm grinding and wire EDM. Capability: Ppk >= 1.67 initial on key characteristics, Cpk >= 1.33 ongoing.
Certificates: ISO 9001:2015 (116024/A/0001/UK/En), IATF 16949:2016 (131941/A/0001/SM/En, with design clause 8.3 excluded, stated openly) and ISO 14001:2015 (116024/B/0001/UK/En), issued to Dongguan Zhuohang Ltd, registration 91441900MA4UWT6X39, founded 2005.
Where we ship: 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 — plus other countries and regions worldwide, shipped from our base in Dongguan, China.
Contact: Felipe Iglesias, [email protected], +86 13126536955.
Ready to run the Swiss-specific checks on a floor that keeps its own evidence?
Email the STEP or IGES model with your toleranced drawing to [email protected] or call +86 13126536955, and receive the machine class, the bar and feeder plan, and the micro-feature measurement plan for your part.
Frequently Asked Questions
Why does a Swiss-type order need verification that a conventional turning order does not?
In short, Because Swiss machining is defined by its equipment and its scale. The sliding headstock and guide bushing decide what can be made and how accurately; the bar feeder and collets decide what runs without stoppage; and the parts are small enough that micro run-out and tiny burrs are proportionally large failures.
What machine specifics should I confirm before paying?
In short, The machine class, its maximum bar diameter and part length, the number of axes, whether it has a sub-spindle for second-operation work, and whether it runs from a bar feeder or a magazine. Each of these decides what your part can be and how it will be made, and each is checkable on a live walk-through of the floor.
How do I verify that a Swiss shop can hold the tolerances my part needs?
In short, Ask for a past lot of a comparable part and read its report: whether diameters, concentricity and roundness carry measured values, whether the values are centered in their tolerances, and how the measurements were taken on features as small as yours. A Swiss shop's capability is demonstrated in the small-feature data of the work it has already shipped, and that data is the evidence to request.
What role do the bar feeder and collets play in the verification?
In short, They decide whether the run is continuous or interrupted. A bar diameter that does not match the feeder, or collets that do not suit the material, cause stoppages and scrap that a first article never reveals.
What should the payment ladder look like on a first Swiss order?
In short, The same evidence ladder as any first order, with Swiss-specific evidence on the middle rung: a deposit for the bar and setup, a middle tranche released against a first-article report carrying the diameters, concentricity, roundness and finish your drawing calls critical, and the balance against the completed documentation and shipping release.
Why do small parts need special attention in cleaning and packaging?
In short, Because a burr or a chip that would be cosmetic on a large part can jam a tiny assembly or scratch a sealing face, and small parts are easy to lose or mix in transit. Ask how the shop deburrs, cleans and counts small lots, and how the packaging prevents damage and mixing, because those steps are part of delivering a small part that is actually usable.
What paperwork should a Swiss turning lot ship with?
In short, The bar certificate with its heat and the incoming verification, the first-article report with measured micro features, the lot summary and the certificate of conformity. On a Swiss part the critical evidence is the small-feature measurement — the concentricity, the roundness, the tiny diameters — so the report must carry those values rather than a selection of easy ones.
Standards referenced on this page
- ASTM A582/A582M-12 — Standard Specification for Free-Machining Stainless Steel Bars
- ASTM B209/B209M-21 — Standard Specification for Aluminum-Alloy Sheet and Plate
- ISO 9001 — Quality management systems — Requirements