Prototype CNC Machining Services
Fast-turn CNC prototypes for engineering validation, fit checks, and pilot builds.
- Quote + DFM notes on critical dimensions
- CNC milling & turning for metal/plastic prototypes
- Optional CMM/FAI inspection reports
- Finishing for fit, function, or appearance
CNC Prototype Machining Services
Fast-turn CNC prototypes built for engineering validation—fit checks, functional testing, and pilot runs. We will provide clear engineering feedback before you cut the next iteration.
- EVT/DVT/PVT prototypes and pilot quantities
- CNC parts with optional CMM/FAI reports and finishing
- Stable lead times, repeatable dimensions, direct engineer support
Upload your CAD and requirements to receive a quote with DFM notes and a realistic lead time.
Capabilities for Prototype CNC Machining
| Capabilities | Standards & Quality Control |
|---|---|
|
Processes: 3-axis / 4-axis / 5-axis milling; CNC turning; mill-turn |
Inspection tools: CMM; height gauge; pin gauges; calipers/micrometers; thread gauges |
|
Max part size: 600 × 400 × 300 mm (larger upon review) |
Reports (optional): FAI / CMM inspection report; critical-dimension report |
|
Min feature size: 0.2 mm (feature-dependent) |
Datums & critical dims: reviewed before machining; DFM notes provided with quote |
|
Tolerance (typical / tight): ±0.05 mm / ±0.02 mm (tight tolerance upon review) |
Measurement approach: first-piece verification; critical-dimension check; final inspection as required |
|
Surface finish: Ra 3.2 μm (as-machined); bead blast; anodize; polishing (Ra 1.6 μm achievable on selected surfaces) |
Finishing control: appearance vs functional intent aligned; masking and consistency managed per requirements |
|
Quantity: 1–500 pcs (prototype to low-volume) |
IP protection: NDA available; secure file handling (as required) |
|
Materials (metals): Aluminum 6061/7075/2024; Stainless steel 303/304/316; Tool steel P20/H13/A2/D2 |
Material control: production-intent material selection supported; substitutions confirmed before machining |
|
Materials (plastics): ABS / PC / POM / PA6 / PA66 / PEEK / PMMA (or equivalents) |
Drawing standards: GD&T supported; datum scheme reviewed for inspectability |
Notes: Tighter tolerances, thin-wall features, and complex geometry are subject to engineering review. Critical dimensions should be clearly marked on the drawing for inspection planning.
Materials for CNC Prototypes
Choose production-intent materials for accurate fit/function validation. Below are common prototype materials we machine.
Metals
Engineering Plastics
Aluminum (6061/7075)
ABS / PC
Practical functional plastics for housings and general engineering prototypes
Stainless steel (303/304/316)
POM (Acetal/Delrin)
Low friction and wear resistance for sliding or moving interfaces
Tool steel (P20/H13, etc.)
PA / PA-GF (Nylon)
Strength and toughness for structural parts and snap features
PEEK
High temperature performance for demanding environments and heat-resistant prototypes
Share your target material and requirements when uploading CAD. We’ll provide a quote with the appropriate machining approach and lead time.
Why Choose Kemal for CNC Prototypes
DFM Support
Before we cut material, we provide DFM notes on tool access, edge breaks/radii, thread methods, and datum strategy—so your next iteration is based on clear, actionable engineering feedback rather than trial-and-error.
Predictable Lead Times
Your prototype schedule won't slip because a shop is overloaded or relying on outsourcing. We run CNC machining in-house with planned capacity, so each project has a real production slot and a stable turnaround.
Repeatable Dimensions
Prototype parts must assemble consistently to make validation meaningful. We machine from defined datums and verify critical interfaces before shipment, with optional CMM checks and FAI/CMM reports for tight-tolerance or high-risk features.
Transparent Quoting
Our quote explicitly lists material grade, quantity break, machining process (milling/turning), finishing, inspection level (standard or CMM/FAI), and any special requirements (threads, tight tolerances, critical features), so pricing and lead time are locked to a clear scope—no hidden add-ons later.
Production-Intent Materials & Finishing
We machine production-intent materials, including 6061/7075 aluminum, 303/304/316 stainless, and engineering plastics (ABS, PC, POM, PA, PEEK). Finishing options include bead blasting, anodizing, and polishing. This helps you validate fit, function, and appearance with fewer surprises.
Secure File Handling + NDA
We support NDA on request and handle your CAD files under controlled access. Customer identifiers can be redacted in photos and reports, and project files are shared only with the team assigned to your job.
How to Work with Us?
A clear, engineering-led workflow to keep your prototype iterations fast and predictable.
Upload CAD
Send STEP/IGES and your drawing/notes (material, quantity, finish, and critical dimensions).
DFM Report
We confirm datums, tolerances, and manufacturability risks—then quote with clear engineering notes.
CNC Machining
CAM programming and CNC machining (milling/turning) based on your validated requirements.
Deburr & Finishing
Deburring is standard; finishing is available for fit, function, or appearance intent.
Inspection & Report
Inspection by CMM/standard gauges as required; optional FAI/CMM reports for traceability.
Packing & Shipment
Protective packaging and shipment arranged to your preferred address and incoterms.
We support CAD, STL, STEP, and IGES formats. Contact us if you encounter any upload issues.
Gallery of CNC Machined Prototypes
From Prototype to Production Manufacturing
Need more than prototypes?
After prototype validation, we can help you choose the right production route based on material, quantity, and part requirements. Use CNC for low-volume builds and tight-tolerance features, or move to injection molding when you need scalable plastic production.
FAQ's
What information do you need to quote CNC prototype parts?
To quote CNC prototype parts quickly and accurately, please provide:
- CAD file: STEP or IGES (STL is OK for reference)
- Material & grade: e.g., 6061/7075 aluminum, 303/304/316 stainless, ABS/PC/POM/PA/PEEK
- Quantity: including any future pilot quantity if applicable
- Drawing or critical requirements: target tolerances, datums/GD&T, and marked critical dimensions
- Finishing: as-machined or required finish (bead blast, anodize, polish, etc.)
- Inspection needs: standard inspection or optional CMM/FAI report
- Deadline & shipping destination: needed-by date and delivery location
If you only have a CAD file, send it with material and quantity—we can proceed and confirm the rest in DFM notes.
Do you provide DFM notes with the quote? What will be covered?
Yes. We provide DFM notes with the quote so scope, risk, and cost drivers are clear before machining. Typical DFM feedback covers:
- Datums & critical dimensions: what to mark/hold for assembly-critical interfaces
- Tool access & machinability: deep pockets, thin walls, small radii, and reach limits
- Edges, radii, and reliefs: recommended edge breaks and internal corner radii for toolability
- Threads & fits: tapping vs thread milling, insert suggestions, press-fit/bearing-seat feasibility
- Setup strategy: features that may require multiple setups and how that impacts tolerance/lead time
- Finishing & inspection implications: what finishing may change and which dimensions should be inspected (optional CMM/FAI)
If a feature is high-risk or cost-heavy, we’ll propose practical alternatives that keep your prototype intent (fit/function/appearance) intact.
What is your typical lead time for CNC prototypes?
Typical lead time for CNC prototypes is 3–7 working days for most parts after CAD and requirements are confirmed. Complex geometry, tight tolerances (e.g., ±0.02 mm), hard-to-machine materials, special finishing, and CMM/FAI reporting can extend lead time.
If you have a deadline, mark it in your RFQ—we can advise the fastest feasible plan and offer expedited options when needed.
Can you support small batch pilot quantities after the first prototype?
Yes. After the first prototype is validated, we can run small batch pilot quantities using the same CNC process and setup strategy to keep geometry consistent. We’ll confirm the target quantity, critical dimensions, and inspection level up front, and can scale from a few pieces to a pilot run with repeatable results.
Do you offer CMM inspection and FAI/CMM reports?
Yes. We offer CMM inspection and can provide optional FAI/CMM reports for prototypes that have tight tolerances or assembly-critical interfaces. If you mark the critical dimensions on your drawing, we can report those features to support verification and faster iteration decisions.
Do you support NDA and secure file handling?
Yes. We support NDA on request and handle your CAD files under controlled access. Project files are shared only with the team assigned to your job, and customer identifiers can be redacted in photos and inspection reports when needed.
When is CNC machining better than 3D printing for rapid prototyping?
CNC machining is the better choice when your prototype needs to behave like a production part.
- Production-intent materials: real metals and engineering plastics with predictable mechanical/thermal performance.
- Tight tolerances & repeatability: reliable fits, hole locations, and flatness across multiple parts/iterations—often best controlled through CNC milling on datum-critical features.
- Threads, press fits, and assembly interfaces: clean tapped holes, bearing seats, datum-driven features.
- Surface quality & appearance: machinable surfaces plus finishing options (bead blast, anodize, polish).
- Functional testing and pilot quantities: when you need 1–low volume parts that assemble and test consistently.
3D printing is usually better for very fast concept models, highly complex internal geometry, and cases where tolerance, surface finish, and true material performance are not critical.
