Custom CNC Machining Service
SunOn Mould provides custom CNC machining services for OEM/ODM buyers, mechanical engineers, procurement managers, product development teams, and hardware startups that need precision metal or plastic parts. Whether you need a single prototype or a production batch, our CNC machining support covers custom milling, turning, and 5-axis machining from our China-based manufacturing facility.
Before requesting a quote, buyers should confirm material and grade, part geometry, tolerance requirements, surface finish, order quantity, and the production stage — prototype, small batch, or volume production. Send a 3D CAD file and a 2D drawing with critical dimensions for the fastest DFM review and accurate quote response.
What CNC Machining Services Does SunOn Support?
SunOn supports a full range of CNC machining processes for custom metal and plastic parts. The right process depends on part geometry, complexity, and tolerance requirements.
Supported CNC processes:
- CNC milling — for prismatic parts, enclosures, brackets, plates, and flat or contoured surfaces
- CNC turning — for cylindrical, rotational, and shaft-type parts
- 5-axis CNC machining — for complex geometries, undercuts, compound angles, and tight-tolerance aerospace-adjacent or industrial components
- CNC prototype machining — single units or small quantities for design validation before tooling investment
- Small-batch CNC machining — low-volume production without injection mold tooling cost
- Precision CNC machining — for parts with tighter tolerances, critical dimensions, and functional fit requirements
If you are unsure which process fits your part, share your drawings and our engineering team will recommend the right setup.
CNC Machining Materials at SunOn
SunOn machines a wide range of metals and engineering plastics. Material selection affects machinability, tolerance achievability, surface finish compatibility, and part performance.
| Material | Common Grades | Typical Applications | Finish Options |
|---|---|---|---|
| Aluminum | 6061, 7075 | Structural parts, enclosures, heat sinks, brackets | Anodizing, bead blast, powder coat, polishing |
| Stainless Steel | 304, 316 | Industrial components, fluid-contact parts, housings | Passivation, polishing, bead blast |
| Brass | C360, C385 | Connectors, fittings, valve bodies, electrical parts | Electroplating, polishing |
| Copper | C101, C110 | Electrical conductors, heat exchanger parts, contacts | Polishing, plating |
| Titanium | Grade 2, Grade 5 | High strength-to-weight parts, industrial and aerospace-adjacent use | Anodizing, polishing |
| ABS | — | Housings, covers, consumer product shells | Painting, bead blast |
| PC (Polycarbonate) | — | Transparent covers, electrical enclosures, optical parts | Polishing |
| PEEK | — | High-heat, chemically resistant structural components | As-machined |
| Delrin (POM) | — | Gears, bushings, sliders, precision mechanical parts | As-machined, polishing |
| PTFE | — | Seals, low-friction wear parts, chemical-resistant components | As-machined |
If your material grade or alloy type is not listed, include it in your RFQ and our team will confirm availability.
Tolerances and Part Specifications
Tolerance requirements directly affect machining setup, inspection needs, and unit cost. SunOn supports general tolerances aligned with ISO 2768 standards, as well as tighter tolerances for precision applications specified by GD&T callouts on 2D drawings.
Key specification factors to confirm before ordering:
- Tolerance class: general or precision per GD&T
- Critical dimensions requiring individual inspection
- Minimum wall thickness for thin-walled features
- Thread type, pitch, and depth (metric or imperial)
- Hole diameter, depth, and positional tolerance
- Surface roughness requirement (Ra value)
- Part envelope — maximum length, width, and height
- Flatness, parallelism, or runout requirements if applicable
If your drawing has mixed tolerance zones, mark critical dimensions clearly. Our DFM review will flag any features that risk tolerance failure or add unnecessary machining cost.
Surface Finishing for CNC Machined Parts
Surface finish affects corrosion resistance, appearance, dimensional accuracy after coating, and assembly fit. SunOn supports post-machining finishing as part of the same order workflow.
Available surface finishes:
- As-machined — standard toolpath finish, suitable for functional prototypes and internal components
- Anodizing (Type II / Type III) — for aluminum parts requiring corrosion resistance or hard-coat surface protection
- Powder coating — for exterior surfaces requiring color, durability, and weather resistance
- Electroplating / Nickel / Chrome plating — for wear resistance, conductivity, or decorative purposes
- Bead blasting / Sandblasting — uniform matte texture for cosmetic surfaces
- Polishing / Brushed finish — for visible or high-gloss parts
- Passivation — for stainless steel parts requiring enhanced corrosion protection
- Black oxide / Heat treatment — for steel parts with hardness or surface protection requirements
Specify your finish requirement, color (if applicable), and any plating thickness or coating standard when submitting your RFQ.
Prototype, Small Batch, or Production — Which Stage Fits Your Project?
CNC machining is cost-effective across multiple production stages. Choosing the right stage affects per-unit cost, lead time, and whether additional tooling investment makes sense.
Prototype CNC machining suits early design validation, functional testing, and investor samples. No tooling cost is required, and changes can be made before committing to mold or production tooling.
Small-batch CNC machining suits bridge production, pre-series parts, and low-volume commercial orders where injection mold tooling is not yet justified. It also suits aftermarket parts, custom industrial components, and hardware assemblies with limited quantities.
Production CNC machining suits parts that require continuous supply, volume pricing, and consistent quality control across repeat orders. For high-volume plastic parts, our team can also advise on the transition from CNC machining to plastic injection molding when tooling amortization becomes cost-efficient.
Industries and Application Examples
SunOn supports CNC machining projects across several industrial sectors:
- Automotive and EV components — brackets, housings, battery module parts, connector bodies, cooling system components
- Electronics and new energy — enclosures, heat sinks, PCB mounting hardware, terminal blocks, structural frames
- Industrial equipment — custom machine components, jigs, fixtures, tooling inserts, mechanical assemblies
- Consumer products — hardware parts, branded product casings, mechanical subassemblies
- General OEM/ODM manufacturing — custom metal or plastic components for product companies sourcing from China
For applications in regulated industries such as medical devices or aerospace-adjacent components, discuss your quality, inspection, and documentation requirements directly with our engineering team before submitting your RFQ.
What Should Buyers Send for a CNC Machining Quote?
Submitting complete information upfront leads to a faster, more accurate quote and reduces DFM revision cycles.
RFQ checklist — send the following:
- ☐ Part name or product description
- ☐ 3D CAD model (STEP or IGES preferred)
- ☐ 2D drawing with tolerances, GD&T callouts, and critical dimensions
- ☐ Material type and grade (if known)
- ☐ Order quantity (prototype / small batch / production volume)
- ☐ Surface finish or coating requirement
- ☐ Color, anodizing type, plating, or painting requirement if applicable
- ☐ Thread, insert, or tapping requirements
- ☐ Inspection or dimensional report requirement
- ☐ Application or industry context
- ☐ Delivery destination
- ☐ Target delivery schedule if applicable
- ☐ NDA request if required
If your 2D drawing is not yet finalized, share the 3D model and list the critical tolerances separately. Our team will review the geometry and provide DFM feedback before quoting.
Why Work with SunOn for Custom CNC Machining?
SunOn is a direct-factory CNC machining service provider — not a marketplace or intermediary. Buyers communicate directly with our engineering team from the first DFM review through production delivery.
Our manufacturing scope covers CNC machining, rapid prototyping, mold making, injection molding, die casting, surface finishing, and assembly — all from a single supplier. This matters for product teams that need to scale from prototype validation to volume production without switching manufacturers at each stage.
For OEM/ODM buyers, this means fewer handoffs, more consistent quality communication, and a clearer path from initial design review to finished parts.
Frequently Asked Questions
What CNC machining processes does SunOn offer?
SunOn offers CNC milling, CNC turning, 5-axis CNC machining, CNC prototype machining, small-batch machining, and precision CNC machining for custom metal and plastic parts.
What materials can SunOn machine?
SunOn machines aluminum (6061, 7075), stainless steel (304, 316), brass, copper, titanium, and engineering plastics including ABS, PC, PEEK, Delrin, and PTFE. Contact us if your material grade is not listed.
What files do I need to request a CNC machining quote?
A 3D CAD file (STEP or IGES) and a 2D drawing with tolerances and critical dimensions are required. If the 2D drawing is not finalized, share the 3D model with key tolerance notes.
Can SunOn handle both prototypes and production orders?
Yes. SunOn supports single-unit prototypes, small-batch machining, and production volume orders. For high-volume plastic parts, our team can advise on transitioning to injection molding when appropriate.
Does SunOn offer DFM review before machining?
Yes. Our engineering team reviews your 2D drawings and 3D CAD files for manufacturability before production begins. DFM feedback helps buyers avoid tolerance issues, unnecessary cost, and rework.
What surface finishes are available for CNC machined parts?
Available finishes include as-machined, anodizing, powder coating, electroplating, bead blasting, polishing, passivation, and black oxide. Specify your finish requirement in the RFQ.
Request a CNC Machining Quote from SunOn
Share your project details with our team for a fast quote response and DFM review.
Send the following when you contact us:
- Part type and intended application
- 3D CAD model (STEP / IGES) and 2D drawing
- Material and grade preference
- Required tolerance class and any critical GD&T callouts
- Surface finish, coating, or plating requirement
- Order quantity and production stage (prototype / small batch / production)
- Inspection or dimensional report requirement
- Delivery destination and target schedule
- NDA request if applicable
Submit your files and project details through the SunOn website: https://www.sunon-mould.com/
Our engineering team will review your drawings, confirm manufacturability, and respond with a detailed quote.
