China Wholesale Prototype CNC Processing

When a buyer searches for china wholesale prototype cnc, they usually mean one thing: a Chinese machine shop that will cut one-off or low-volume parts at a per-part price close to production pricing. No catalog and no stock sit behind that price. The shop quotes from your CAD files, programs the toolpaths, and machines the quantity you ask for. Wholesale here describes the cost structure, not a warehouse.

That distinction matters for how you write the RFQ. A distributor can ship tomorrow from a shelf, and a machine shop cannot. Send a 3D STEP file, a 2D drawing with datums and tolerances, the material grade, the finish, and the quantity you want first. If the drawing lives only in your head, the quote will be wrong in one direction or the other.

GreatLight runs three wholly-owned plants in Dongguan and one in Singapore, with 127 high-precision CNC machines and 150 technicians. Founded in 2011, we have spent 15 years quoting prototype work from single pieces up to 10,000+ part runs. There is no minimum order quantity. One bracket is a normal order here.

Five-axis work pays off when a part has features on several faces, or when every setup adds error. A housing with bores on four sides, a bracket with compound angles, an impeller with twisted blades: one 5-axis setup replaces three or four 3-axis setups. Fewer setups means fewer datum shifts, and the position error that comes with them disappears.

A straight Z approach cannot reach undercuts, deep side walls or steep flanks without a long tool that deflects. Tilting the table or the spindle keeps the tool short and stiff, which holds size and surface finish. Our 16 simultaneous 5-axis machining centers take parts up to 4,000 mm, with a Ø400 mm rotary table for smaller work.

Five-axis is not automatically the cheaper route. A flat plate with a few holes runs faster on a 3-axis machine, and programming time stays low. We have 27 three-axis machines and 12 four-axis mills for exactly that reason. The quote tells you which route we picked and why.

• 1
  Use 5-axisFeatures on 3+ faces, compound angles, undercuts, thin ribs, tight true position
• 2
  Use 3-axisFlat plates, simple pockets, through-holes, loose tolerances, fast turnarounds
• 3
  Use mill-turnShafts, bushings, fittings with turned and milled features on one part

Our general machining tolerance is ±0.005 mm (±0.0002 in), but that number is not a default on every dimension. It applies where the drawing calls for it and where the geometry allows it. A 4,000 mm long part cannot hold the same tolerance as a 40 mm bushing, because thermal drift and machine geometry enter the picture. Mark the critical dimensions and leave the rest general.

Surface finish follows the same logic. As-machined faces land at Ra 1.6–3.2 μm. A fine cut gets to Ra 0.8–1.6 μm, and lapping or polishing reaches Ra 0.2–0.8 μm. Every extra step adds cost, so specify only the faces that seal, slide or mate. A cosmetic face on the inside of a housing rarely needs the same callout as a bearing bore.

Materials we machine every week include 6061-T6 and 7075 aluminium, 303 and 17-4PH stainless, 4140 steel, C36000 brass, Ti-6Al-4V titanium and PEEK. Finishes run from clear or hardcoat anodizing to electroless nickel, black oxide, bead blasting and laser marking. Marked characters must be at least 1.5 mm tall to stay legible after coating.

A prototype is only useful if it matches the model. We inspect 100% of parts before shipment, covering raw material check, in-process monitoring and final inspection. Reports go out on request. For a first article, ask for dimensional results on the critical callouts plus material certificates. That is the file your own quality team will want when the part reaches the test bench.

CMM reports make sense for tight true position, bore-to-bore distances and profile tolerances. A caliper check is enough for overall length and simple slot widths. Anything involving a sealing surface or a bearing fit deserves a roundness or surface roughness reading, because those two values decide whether the assembly leaks or seizes.

Our qualification rate runs at 99.99%, and historical late-delivery probability sits below 2%. Those are internal numbers, not a promise about your order. Read them as a sign that the process is stable, then protect yourself with your own incoming inspection.

Quotations and a free DFM analysis come back within 12 hours. Production can start within 24 hours, and parts ship in 3–5 days for standard prototype quantities. Cost per part drops once a program exists, so a second run of the same part is cheaper than the first. Volume pricing starts to matter above a few hundred pieces, where fixtures and tooling amortize.

Communication is the real variable. A shop that returns marked-up screenshots showing draft angles, corner radii and thin sections saves you a scrapped batch. We flag those before cutting. Uploads stay secure and confidential, and an NDA is available on request.

China is the wrong choice when your part needs a licensed process, when the material is controlled by export rules, or when an on-site engineer must witness every operation. For a bracket, a manifold or a machined enclosure, the economics usually favor a Chinese prototype shop. For a flight-critical component under a strict qualification program, keep the work where the auditor can walk in.