CNC Prototype Machining – 1 to 10 Pieces, No Tooling
Functional machined prototypes in aluminum, stainless steel, brass, engineering plastics and titanium – from a single piece to 10 pieces, typically in 3-5 business days. No tooling investment, free DFM feedback with every quote, and a direct path to production when your design is proven.
Free Consultation1 Piece
Minimum Order
3-5 Days
Typical Turnaround
±0.02mm
Prototype Tolerance
Unlimited
Design Iterations
Materials
| Grade | Properties | Typical Applications |
|---|---|---|
| Aluminum (AL6061-T6 / AL7075-T6 / AL5052) | The default prototype material: fast cutting, low cost, readily available in plate and bar. 6061 machines cleanly and anodizes for presentation-quality parts; 7075 for strength-critical prototypes. | Enclosures, brackets, structural prototypes, jigs, presentation models, fit-check parts |
| Engineering Plastics (POM-C / PC / ABS / PA66 / PMMA) | Machined from solid stock – no mold, no gate marks. POM for precision functional parts, PC for tough transparent parts, ABS for low-cost look-and-feel models, PMMA for clear display prototypes. | Housings, consumer-product models, transparent windows, snap-fit prototypes, insulating parts |
| Stainless Steel (SUS303 / 304 / 316L) | For prototypes that must survive corrosion, heat or hygiene requirements. SUS303 cuts fastest; 304/316L for real-world exposure testing and functional stainless parts. | Valve prototypes, food-equipment parts, marine hardware, medical device components |
| Brass & Copper (C3604 / H62 / T2) | Excellent surface finish and chip control; brass is ideal for threaded and electrical prototypes. Copper for thermal and conductivity testing samples. | Connector prototypes, fittings, thermal test parts, decorative hardware |
| High-Performance (PEEK / Titanium Gr5 / 45# Steel) | When the prototype must survive the real environment: PEEK for 260°C and chemical exposure, Ti-6Al-4V for aerospace strength-to-weight, 45# steel for durability and wear testing. | Aerospace prototypes, medical implants, engine-bay parts, wear-test samples |
Process Parameters
| Parameter | Standard Range |
|---|---|
| Prototype Quantity Range | 1 – 10 pieces (extendable to 100+ for pilot runs) |
| Prototype Lead Time | 3-5 business days standard; 5-10 days for 5-axis or complex geometry |
| Dimensional Tolerance | ±0.02mm standard; ±0.01mm achievable on critical features |
| Tooling Investment | None – prototypes are machined from solid stock |
| Maximum Part Size (3-axis) | 1000mm x 600mm x 500mm |
| Minimum Feature Size | 0.5mm holes and slots; 0.8mm minimum wall |
| Surface Roughness (As-machined) | Ra 1.6μm – 3.2μm; polished to Ra ≤0.4μm on request |
| Surface Finish Options | Bead blast, anodizing, painting, black oxide, passivation, vapor polish – added lead time 2-5 days |
| File Formats Accepted | STEP, IGES, STP, X_T, DWG, DXF, PDF, or physical sample for reverse engineering |
| Revision Handling | Same-day re-quote on revised geometry; tooling-free changes take effect immediately |
Surface Finishes
As-Machined
Direct tool marks, Ra 1.6-3.2μm. Fastest and cheapest – correct choice when the prototype is for fit, function or testing and appearance does not matter.
Bead Blasting
Uniform matte texture that hides tool marks and gives machined aluminum and steel a consistent, professional look. Popular for prototypes that will be photographed or shown to stakeholders.
Anodizing (Type II)
Color anodizing for aluminum prototypes – clear, black, red, blue or custom. Adds corrosion protection and a finished-product appearance, useful for crowdfunding videos and trade-show models.
Vapor Polishing / Painting
Vapor polishing gives clear plastics (PC, PMMA) optical transparency. Spray painting matches RAL or Pantone colors for appearance models and packaging-fit prototypes.
Passivation & Black Oxide
Stainless prototypes are passivated to restore corrosion resistance after machining; steel prototypes can be black-oxided for a uniform dark finish and mild corrosion protection.
Laser Engraving & Marking
Part numbers, revision letters, logos or assembly marks engraved directly on prototypes – essential when managing multiple design iterations that must not be mixed up.
Design for Manufacturing (DFM)
- Design for prototype reality: keep tolerances at ±0.02mm unless the test truly requires tighter – every extra decimal on the drawing adds inspection time and cost to a 5-piece run
- Use stock plate and bar sizes (6061 plate in 10/20/30mm, bar in standard diameters) – prototypes cut from standard stock ship days faster than custom-billet parts
- Minimize setups: each face flip or re-clamp adds tolerance stack-up risk. Group features on one or two faces where the design allows
- Choose material for the test, not the final product: a POM prototype often validates a PA66 production part faster and cheaper, and an aluminum prototype can stand in for a cast production part in most functional tests
- Add machining allowance where the prototype will be measured with gauges or fitted to hardware – you cannot hand-scrape a machined prototype, so design the fit in
- Specify threads as through-tapped holes with standard sizes (M3-M12) rather than custom threads – prototype threads are cut, not molded, and standard sizes are free
- Mark critical dimensions clearly on the drawing; everything else stays at general tolerance so the machinist can optimize the strategy
- Consider assembly in the prototype: design bolt-on access panels and snap features so functional testing does not require destructive disassembly
- When geometry is very complex (internal channels, lattice, organic shapes), ask us about 3D printing as a complement – we will tell you honestly which route is faster for your geometry
- Upload STEP files with the quote request; our free DFM review returns within 24 hours with cost drivers, risk notes and suggested improvements
Tooling & Capacity
| Type | Lead Time | Suitable For |
|---|---|---|
| 3-Axis CNC Milling (No Tooling) | 3-5 days prototype / 7-12 days pilot run | Most prototype geometry: brackets, plates, housings, enclosures. The default route – zero tooling cost, changes are free, lead time starts immediately |
| 4-Axis / 5-Axis CNC | 5-10 days prototype | Complex contours, compound angles, undercuts, impellers and parts that would need multiple setups on 3-axis. One setup means better accuracy for fit-critical prototypes |
| CNC Turning / Mill-Turn | 3-7 days prototype | Rotational prototypes: shafts, bushings, connectors, threaded parts. Live tooling adds cross-features in one setup for parts that mix turning and milling |
| Bridge Tooling / Soft Tooling (Optional) | 2-4 weeks | When the prototype phase graduates to 50-500 pieces: single-cavity aluminum or soft tooling bridges the gap before committing to a production mold |
Quality Assurance
- First Article Inspection on every prototype batch – full dimensional report with measured values, not just pass/fail
- CMM measurement on critical features; hand gauges (micrometers, calipers, pin gauges) on remaining dimensions
- Material verification on every prototype – alloy confirmed against the order before machining starts
- Surface finish check where cosmetic or functional appearance matters (Ra measurement, color match against reference)
- Fit-check service: we assemble your prototype against your hardware or sample parts and report findings before shipping
- Photographic documentation of finished prototypes available on request – useful for remote teams and stakeholders
- Revision control: part revision, program number and operator recorded on the traveler for every prototype
- NDA-backed handling of all design files – prototypes are often pre-patent and treated accordingly
Applications
- Design validation: functional prototypes that prove form, fit and function before production tooling is committed
- Engineering testing: stress, thermal, vibration and drop-test samples machined in the production-intent material
- Ergonomic and human-factors review: full-size models for grip, reach and usability studies with real users
- Trade shows and investor presentations: appearance-quality prototypes with anodizing, painting and engraving
- Patent and IP filings: working models demonstrating the invention, handled under NDA
- Crowdfunding campaigns: production-intent samples for video shoots and backer updates
- Pilot production: 10-100 piece runs for field trials, beta customers and early sales before full tooling
- Reverse engineering: physical samples measured and re-machined when original drawings are lost or unavailable
Why Choose FHY Precision
Zero tooling cost: prototypes are cut from solid stock – you pay for machining, not for a mold. This is why 1-piece and 5-piece orders are economically sensible
Fastest route to first parts: 3-5 days from file acceptance to shipment, because nothing waits for toolmaking
Free DFM feedback: every prototype quote comes with engineering notes on cost drivers, tolerance risks and design improvements – you learn what production will demand
Unlimited revisions: design changes cost nothing but the new machining time. Iterate five times if that is what it takes to get the design right
Same quality system as production: FAI reports, material verification and traceability apply to a 1-piece prototype exactly as to a 10,000-piece order
Material breadth: from ABS appearance models to PEEK and titanium functional prototypes, without re-tooling or re-qualifying a process
Direct path to production: when the design is proven, the same files, same materials and same team scale into pilot runs and production – no re-learning curve
NDA protection: your pre-patent designs are handled under signed NDA; we can sign yours or provide ours
FAQ
1. What is your minimum order quantity for prototypes?
One piece. There is no minimum for CNC prototype machining because there is no tooling – each part is cut from solid stock. Most prototype orders run 1-10 pieces; we regularly extend into 50-100 piece pilot runs when field trials need them.
2. How fast can I get machined prototypes?
Standard prototypes ship in 3-5 business days from file acceptance. Complex 5-axis geometry runs 5-10 days. Surface finishing (anodizing, painting, plating) adds 2-5 days. Urgent jobs are often possible – tell us your deadline with the quote and we will confirm honestly whether it is achievable.
3. Why is CNC machining better than 3D printing for prototypes?
CNC machining uses real production materials – actual AL6061, actual POM, actual stainless – so functional tests measure the material your production part will be made from. 3D printed parts have anisotropic strength and layer lines that can mislead test results. For fit models, snap-fit testing and anything load-bearing, machined prototypes give truer answers. 3D printing wins on very complex internal geometry and on price above roughly 20 pieces; we will recommend the right route per part.
4. What files do you need to quote a prototype?
STEP, IGES, X_T or STP files are ideal. We also accept DWG/DXF and PDF drawings with dimensions. If you only have a physical sample, we can CMM-scan it and build a model. Sketch-level ideas are workable too – our engineers will ask the questions needed to turn them into machinable geometry.
5. How much does a machined prototype cost?
Pricing is material + machine time (setup + cutting) + finishing + inspection. Simple aluminum or plastic prototypes in 1-5 pieces typically start at modest per-piece rates because setup is the dominant cost at low quantity. Complex 5-axis, titanium or tight-tolerance parts cost more. You receive an itemized quote within 24 hours – and the DFM notes often cut the price on the next revision.
6. Can you machine a prototype from a drawing without a 3D model?
Yes. Our programmers interpret 2D drawings routinely. Mark critical dimensions and tolerances on the drawing; unspecified features stay at general tolerance. If the drawing leaves ambiguity, we ask before cutting rather than guess.
7. What happens when my design changes between iterations?
Nothing is locked – there is no tooling to modify. Send the revised file and we re-quote the same day. Many customers run 3-5 prototype revisions; each one is an opportunity to simplify geometry, and our DFM notes accumulate across revisions so the final design is production-ready.
8. Can you make prototypes that match production finishes exactly?
For machined materials, yes: anodizing colors can be matched to RAL/Pantone references, painting to color chips, and surface texture to Ra specifications. What a machined prototype cannot replicate is a molded surface with texture or grain, or molded-in color. When finish fidelity matters for appearance models, we will note what will differ in production.
9. Do you sign NDAs for prototype work?
Always – and prototype work is exactly when NDA matters most, because designs are often pre-patent. We can sign your NDA template or provide ours. Files, drawings, samples and business information are all covered, and this applies to every prototype order regardless of size.
10. How do prototype parts transition to production?
smoothly: same files, same materials, same engineering team. The prototype program becomes the production program – revisions are already incorporated, DFM is already done, and the learning transfers. When volume justifies tooling (injection molding, die casting), the machined prototypes serve as the benchmark for first-article comparison.
11. Can you supply prototype samples for Amazon or crowdfunding campaigns?
Yes. Many customers use machined prototypes for campaign videos, photography and early backer samples. We can supply 10-50 pieces with consistent finishing, laser-engraved part numbers and retail-style packaging if needed. Machined parts make excellent "production-intent" campaign samples.
12. What if my prototype does not fit or work as expected?
That is what prototypes are for – and we treat failures as engineering data. We will help analyze the result: dimensional verification, fit-check against your hardware, and material confirmation. If the fix is a design change, the next iteration is quick and cheap. If the fix is material or tolerance, we adjust the next run. This loop is the cheapest place to catch problems.
13. What are the main cost drivers for a machined prototype?
Five, in rough order of impact: machining time (part complexity, number of setups), tolerance level (tight callouts slow feeds and add inspection), material (exotic alloys cost more to buy and machine), surface finish (sub-Ra 0.8 needs extra passes), and quantity (setup cost dominates at 1-3 pieces and amortizes by 10-20). The cheapest prototype is not the one with the lowest quote – it is the one that does not need three rounds. A 15-minute DFM review before quoting typically finds more savings than any negotiation after.
14. Should I batch my prototype iterations into one order?
Usually yes, if you are reasonably confident in the design direction. Tell us upfront that you expect two or three rounds – we can hold fixtures and programs between rounds, which often cuts round-two and round-three lead time by 30-40%. The opposite strategy also works: single-piece fast iterations when the design is genuinely uncertain. What costs money is an unplanned iteration that restarts programming and fixturing from zero with no warning. Plan the iteration strategy with us at the start.
15. What file formats are best for requesting a prototype quote?
STEP or IGES for the 3D geometry, plus a 2D PDF drawing showing tolerances, surface finishes, threads and material spec. Parasolid (XT) and native CAD files also work well. STL is a mesh – we can use it, but the shop has to reconstruct surfaces before programming, which adds time and risk on complex geometry. If you only have STL, say so upfront so we plan around it. Photos and physical samples are perfectly fine for a first conversation.
16. What DFM changes most often reduce prototype cost?
The recurring three: sharp internal corners that force EDM as drawn (a 0.5mm radius usually removes the operation entirely), thin walls or deep pockets that need light-pass machining with small tools, and tolerances tighter than the function requires. One in four incoming prototype files gets at least one DFM note from us – usually a radius fix or a flatness callout that can be relaxed to spec. None of these changes compromise function; all of them cut cost and lead time. We flag them before you commit, not after.