Precision Machining Company Services
The material list matters because the same tolerance behaves differently in a free-machining alloy and a gummy or abrasive one. This floor covers the families buyers specify — aluminum, stainless steel, carbon and alloy steel, brass, copper, titanium, and magnesium, plus engineering plastics including ABS, POM, nylon, PTFE, and PEEK. Every incoming lot is XRF-checked against its mill certificate, so the alloy that reaches the spindle is the alloy on your drawing — a mixed lot is caught before it can become a precision failure.
| Material family | Best-suited process | Typical tolerance | Note |
|---|---|---|---|
| Aluminum | Milling / turning | ±0.003 mm (milling) / ±0.002 mm (turning) | Free-cutting and fast |
| Stainless steel | Turning / milling | ±0.01 mm | Work-hardens; needs sharp tooling |
| Carbon / alloy steel | Turning / grinding | ±0.01 mm | Heat-treatable after machining |
| Brass / copper | Turning | ±0.002 mm | Free-cutting, fine finish |
| Titanium | Milling / turning | ±0.01–0.02 mm | Slow, rigid cuts required |
| Engineering plastics | Milling / turning | ±0.05–0.1 mm | Thermal expansion moves the size |
The table is a starting map, not a contract — the final tolerance on any material is set by the feature geometry and the process route, read together in the DFM review. But the direction holds: a tolerance that is routine in aluminum is a specialty in stainless, and a plastic part that needs metal-class tightness has to be designed around the material's thermal movement, not against it.
How do you know a tolerance is achievable before quoting?
The DFM review is the step where a tolerance is checked against the process that must hold it. Each critical dimension is read against the machine, tooling, and measurement available, and any dimension the process cannot reliably hit is flagged before cutting, so you decide to loosen it or route it to a secondary operation. A precision machining company does this before quoting; a shop that does not is gambling your tolerance on a process it has not checked.
The review is not a form; it is a reading of each critical dimension against the machine, the tooling, and the measurement that will verify it. The output is a list of flags — dimensions the process can hold, dimensions it can hold only with a secondary operation, and dimensions it cannot hold at all. That list is what turns "we can do it" into "here is how we would do it," which is the sentence you should be listening for before any price is agreed.
What secondary operations affect precision?
Precision does not end at the chip. Anodizing, plating, powder coating, painting, brushing, and mirror polishing are bundled, and each can shift a dimension after machining, so a DFM review plans for that shift. Heat treatment runs on a controlled route: the in-house ovens reach 500 °C for aluminum aging and low-temperature steel stress relief, while titanium stress relief above that goes to a qualified partner, stated plainly. A finish that changes a dimension is planned for, not discovered after the parts arrive.
| Secondary operation | Typical effect on a machined dimension |
|---|---|
| Anodizing | Adds a thin oxide layer; can close a tight bore |
| Plating | Adds measurable thickness; machine under-tolerance to allow it |
| Powder coating | Thick layer; mask functional and mating faces |
| Heat treatment | Can distort; route stress relief before finishing |
| Mirror polishing | Removes a small amount of stock; leave a finishing allowance |
The rule across all of them: the finishing allowance is part of the machining plan, not an afterthought. A bore that must land at size after anodizing is machined to a size that accounts for the oxide layer; a surface that must stay clean through powder coating is masked before the gun touches it. When the allowance is planned in the DFM review, the finished part lands inside tolerance instead of outside it.
How do MOQ and lead time support precision validation?
Precision is best validated on a single part before it is scaled to a production run. The 1-piece MOQ lets you order one prototype, confirm the design and the achievable tolerance, and then scale the same program, so the process parameters carry forward instead of being relearned by a new supplier. Lead time runs 3, 7, or 30 days by complexity and process steps, stated honestly rather than as a fixed promise that drifts.
A single-piece MOQ is the cheapest experiment you can run. One part validates the drawing, the tolerance, and the process before any volume is committed, and the process parameters from that one part carry forward into production. The lead-time range follows the same logic: a part with one process step ships fast, a part with several ships slower, and a tolerance that is rushed is a tolerance that drifts, so the schedule is set by the work, not by a promise made before the drawing was read.
How do you match a feature to the right process?
Every feature on a drawing points at a process. The match is not a preference; it is the geometry deciding what can cut it. A pocketed housing points at milling; a shaft points at turning; a bearing seat points at grinding; a part that needs both turned and milled features points at mill-turn. Choosing the wrong process is choosing a fight — the feature will be cut, but slowly, expensively, and to a tolerance the process was never meant to hold.
| Feature | Process | Why it matches |
|---|---|---|
| Pockets, flats, holes | Milling | A rotating cutter reaches prismatic faces |
| Round parts, threads | Turning | A rotating workpiece suits a stationary tool |
| Bearing seats, tight finishes | Grinding | Abrasive holds the tightest band |
| Turned + milled in one | Mill-turn | One clamping, no re-clamp error |
| Long, slender shafts | Swiss turning | A guide bushing supports the stock at the cut |
The mapping is the second thing a DFM review does, after checking that the geometry is machinable at all. Match the feature to the right process and the tolerance is a consequence of the routing; mismatch them and the tolerance becomes a problem the process has to fight. The difference shows up in the quote — one is a plan, the other is a gamble.
Why does Swiss-type turning suit long, slender parts?
Swiss-type turning exists for the parts a conventional lathe struggles with: long, slender shafts where tool pressure would bow the stock. The machine feeds the bar through a guide bushing, so the cut happens right at the support, and the bar never has room to deflect. That is how a thin pin holds its diameter along its whole length instead of tapering under the cut.
The practical difference shows on parts with a high length-to-diameter ratio — pins, medical shafts, small precision spindles. On a conventional lathe the stock flexes away from the tool; on a Swiss machine the bushing holds it at the cut. The result is a straight, true diameter along a length that would drift on any other turning process. This floor runs Citizen, Star, and Tsugami Swiss-type machines for exactly that class of part, and the machine brand is on the nameplate for you to confirm.
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). Designed 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). Designed 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). Designed 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). Designed for shafts, bushings, flanges up to ±0.002 mm.
- Wire EDM (5+) - Sodick AQ535L (550/350/300 mm travel, ±20° taper, 800 kg workpiece). Designed 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.
Match a process to your tolerance before you cut
Send your drawing to [email protected] or call +86 13126536955 for a DFM review and quote.
Frequently Asked Questions
Which precision machining processes do you run?
CNC milling (3-axis, 4-axis, and 5-axis), CNC turning, mill-turn, and precision grinding, backed by 100+ production machines. Each process maps to a machine count, so the capability list is something you can confirm rather than accept on trust.
What precision does each process hold?
In short, Milling and turning hold ±0.003 mm (milling) / ±0.002 mm (turning), and precision grinding holds ±0.002 mm, verified on Hexagon CMMs. On a representative length characteristic the process showed Cpk 1.851 (one characteristic on one part, not a blanket capability claim) against an initial-study target of Ppk ≥ 1.67 on key characteristics and a production target of Cpk ≥ 1.33.
How does single-setup machining improve precision?
In short, Mill-turn centers machine turned and milled features in one clamping, so the part never moves between a lathe and a machining center. That removes re-clamp error, which is the main source of position drift between features — a bore stays true to a face by construction.
Which materials do you machine precisely?
In short, Aluminum, stainless steel, carbon and alloy steel, brass, copper, titanium, and magnesium, plus engineering plastics such as ABS, POM, nylon, PTFE, and PEEK. Every incoming lot is XRF-checked against its mill certificate, so the alloy you specify is the alloy that reaches the spindle.
How do you know a tolerance is achievable before quoting?
In short, The design-for-manufacturability review checks each tolerance against the process that must hold it, and flags any dimension the process cannot reliably hit. That means an achievable tolerance is confirmed before cutting, rather than discovered as a reject after machining.
What is the MOQ and lead time?
The MOQ is 1 piece, and lead time runs roughly 3, 7, or 30 days depending on part complexity and the number of process steps. A single prototype validates both the design and the achievable precision before any volume commitment.
Which process should I choose for a long, slender shaft?
In short, Swiss-type turning. A conventional lathe lets the stock flex away from the tool under cutting pressure, but a Swiss machine feeds the bar through a guide bushing that supports it at the cut.
Can one part run through multiple processes?
In short, Yes, and the routing is planned in the DFM review. A part can be turned, then milled, then ground, with each step matched to a feature — the tolerance decides which process each feature needs.
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