CNC Taiwan Price List: What Actually Drives the Number

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  Key takeaways
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  Seven factors that move a CNC Taiwan price list
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  Why tolerance is the first line on any CNC Taiwan price list
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  Material choice and surface finish on the quote
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  Quantity, setup and the CNC Taiwan price list curve
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  Certifications, lead time and what they cost
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  How to read a quote and spot a weak one
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  Step by step: getting a usable CNC Taiwan price list quote

Tolerance drives cost more than material or part count. A bracket held at ±0.1 mm can run on a 3-axis mill with a roughing and finishing pass. The same bracket at ±0.005 mm needs a temperature-stable setup, a finishing cutter with minimal runout, and a CMM check that takes longer than the cut. That is where the price difference comes from.

The practical breakpoints are ±0.1 mm, ±0.05 mm and ±0.01 mm. Below ±0.05 mm, most shops start adding in-process checks. Below ±0.01 mm, you are paying for metrology as much as for machining. If a drawing calls for ±0.005 mm on a feature that mates with nothing, loosen it and the quote drops.

Tolerance also interacts with material. Aluminum 6061 moves less under cutting heat than 7075 or stainless 316L. On a thin wall, a ±0.02 mm callout in 7075 may need two stress-relief cycles. Ask whether the tolerance is measured at 20 °C, because a warm part measures differently.

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  Put tight tolerances only on mating featuresGeneral dimensions can sit at ±0.1 mm without affecting function.
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  Watch thin wallsUnder 1 mm wall thickness, deflection becomes the limiting factor, not the machine.
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  State the datum schemeA clear GD&T datum removes guesswork and shortens the quote.

Material cost per kilogram is only part of the picture. Machinability sets cycle time. Aluminum 6061 machines fast and holds tolerance well, which is why prototypes and fixtures default to it. Stainless 304 galls and work-hardens, so feeds and speeds drop and tool wear rises. Titanium Ti-6Al-4V and Inconel push cycle time up by 3–5× against aluminum.

Surface finish is a separate operation in most quotes. As-machined at Ra 1.6–3.2 μm comes off the machine. Ra 0.8–1.6 μm usually needs a finish pass with a sharp cutter. Ra 0.2–0.8 μm often means lapping or polishing after machining, and that is billed by hand time. Anodizing, electroless nickel and powder coating add a line item each.

One trap: specifying a cosmetic finish on a functional face. Bead blasting a sealing surface changes the surface texture and can break a seal. Mask the functional zones on the drawing before the shop quotes, or the finishing house will ask later and the price will change.

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  Match the alloy to the load case6061 for general parts, 7075 for high strength, 17-4PH for corrosion plus strength.
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  Separate cosmetic and functional finishesMask sealing faces, bearing bores and threads before blasting or coating.

Setup is a fixed cost. Programming, fixture design, first-article inspection and machine warm-up do not shrink with order size. On a 10-piece order, setup can be 60% of the total. On a 1,000-piece order, it drops below 5%. That is why a per-part rate quoted at quantity 1 looks alarming next to the same part at quantity 500.

The curve flattens once the fixture is proven. A shop with no minimum order quantity can run one prototype and then scale the same fixture for a 10,000-piece run, which keeps the second order cheaper than starting fresh. Ask whether the fixture is retained between orders. If it is scrapped, you pay for it twice.

Bar stock and plate stock also matter at low volume. A part nested from standard plate wastes less material than one cut from a custom extrusion. If the shop can nest your part alongside other jobs, material yield improves and the quote reflects it.

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  Quote the same part at three quantities1, 50 and 500. The spread tells you how much is setup and how much is cutting.
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  Ask about fixture retentionStored fixtures make repeat orders cheaper and faster.
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  Check nestingStandard plate sizes cut material waste without changing the design.

ISO 9001:2015 covers basic quality management. IATF 16949:2016 adds automotive traceability and PPAP discipline. ISO 13485:2016 brings medical device process control. ISO 27001:2022 covers information security, which matters if your drawings are confidential. Each one adds documentation, calibration schedules and audit time, and part of that lands in the unit price.

Lead time is not a price line, but it changes the total cost of a project. A quote that ships in 3–5 days after production start keeps a build on schedule. A cheaper quote that takes three weeks can stall an assembly line. The useful question is not 'what is the fastest lead time' but 'what is the realistic lead time for this specific part'.

Documentation is a hidden line. A standard shipment includes a dimensional report on request. A full inspection report with CMM data, material certs and traceability adds inspection hours. If your quality plan requires it, say so up front so the shop prices it into the first quote rather than adding it later.

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  Name the standard you needIATF 16949 for automotive, ISO 13485 for medical, ISO 9001 as the baseline.
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  State the inspection levelFull report, sampling or standard. It changes the quote.
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  Confirm the shipping termShipping method and Incoterms change the landed cost more than the part price.

A usable quote lists material, machining hours, finishing, inspection and freight as separate lines. If the quote is a single number with no breakdown, you cannot tell whether the shop understood the drawing. Ask for the DFM notes. A shop that flags a thin wall or an unreachable feature before cutting is doing engineering work, not just estimating.

Watch for a quote that is far below the others. It usually means one of three things: the shop missed a tolerance, it plans to run the part on the wrong machine, or it will come back with a change order after the first article. The cheapest number is often the most expensive outcome.

Payment terms and tooling charges belong in the same conversation. A shop that charges separately for fixtures should say whether the fixture transfers to you. A shop that folds fixture cost into the unit price should say at what quantity the fixture is paid off. Both models are fine as long as it is stated.

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  Ask for a line-item breakdownMaterial, machining, finishing, inspection, freight.
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  Request DFM feedback with the quoteIt shows whether the shop read the tolerances or just the quantity.
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  Clarify fixture ownershipKnow whether you pay for tooling once or on every order.