What Is CNC Milling?
CNC milling involves cutting a workpiece using computer […]
With over 50+ CNC milling machines, including advanced 3-axis, 4-axis, and 5-axis mills, we excel at producing intricate metal and plastic components from prototypes to full-scale production.
CNC turning services provide exceptionally fast and precise production of round components from metal or plastic bars, tubes, and other shapes using advanced lathes and high-precision turning centers.
Swiss machining provides exceptional precision for small, intricate parts with tight tolerances. Perfect for complex geometries, it ensures efficiency and consistency in both prototypes and production runs.
Our Factory Space
CNC Machines
Dedicated Team
DirectProto offers fast and accurate CNC machining services for product development and concept validation. Ideal for engineers and designers who need quick prototypes with high dimensional precision.
DirectProto's low-volume CNC machining delivers cost-effective manufacturing from 10 to 500 parts, ensuring consistent quality and precision for your seamless prototype-to-production transition.
DirectProto delivers ISO-certified high-volume CNC machining with guaranteed dimensional accuracy and premium surface finishes, ensuring your end-use parts meet exact specifications every time.
Aluminum offers high strength-to-weight ratio, corrosion resistance, and excellent thermal/electrical conductivity, making it ideal for aerospace, automotive, and precision CNC machining. Its machinability and weldability ensure fast, cost-efficient production without sacrificing performance.
Aluminium 7075-T651 | 3.4365 | 76528 | AlZn5.5MgCu Aluminium 6082-T651 | 3.2315 | 64430 | AlSi1MgMn Aluminium 6060 | 3.3206 | AlMgSi Aluminium 5052 | EN AW-5052 | 3.3523 | AlMg2,5 Aluminium 2017 | 3.1325 | 24530 | AlCu4MgSi
As machined, Anodizing, Powder coating, Electroplating, Painting, Sand blasting, Polishing
Brass delivers an unbeatable combo of machinability (20% faster than steel), corrosion resistance, and antimicrobial properties—making it the go-to for precision valves, marine fittings, and medical instruments. This golden alloy balances strength with ductility, conducts heat/ electricity like a champion, and polishes to jewelry-grade brilliance for decorative hardware and audiophile components.
H59, H62, C260, C360
As machined, Polishing, Sand blasting, Tumbling, Electropolish, Alodine, Heat treatment, Black oxidize, Electroless nickel, Chrome plating, Brushed finish
Copper delivers superior electrical & thermal conductivity with excellent corrosion resistance, perfect for electrical components, heat exchangers, and precision CNC machined parts. Its high ductility and machinability allow tight tolerances while maintaining durability under stress.
C11000, C10100, C10200
As machined, Polishing, Sand blasting, Tumbling, Electropolish, Alodine, Heat treatment, Black oxidize, Electroless nickel, Chrome plating, Brushed finish
Bronze combines high strength, wear resistance, and low friction with natural corrosion protection, making it ideal for bearings, marine hardware, and precision CNC components. Its machinability and fatigue resistance ensure long-lasting performance in demanding mechanical and chemical environments.
C64200, C93200
As machined, Polishing, Sand blasting, Tumbling, Electropolish, Alodine, Heat treatment, Black oxidize, Electroless nickle, Chrome plating, Powder coating, Brushed finish
Steel offers exceptional strength, durability, and impact resistance while maintaining reliable machinability for tight-tolerance components. Its versatility in heat treatment and corrosion-resistant alloys makes it ideal for automotive, aerospace, industrial machinery, and structural applications.
Structured Steel, Mold Steel, Alloy Steel, Tool Steel, Bearing Steel, Carbon Steel
As machined, Electroplating, Passivation, Powder coating
Stainless steel delivers superior strength, corrosion resistance, and heat tolerance with excellent machinability for precision parts. Its hygienic and oxidation-resistant properties make it essential for medical, food processing, marine, and chemical industries.
Stainless Steel SUS201, SUS303, SUS 304, SUS316, SUS316L, SUS42, SUS430, SUS431, SUS440C, SUS630/17-4PH, AISI 304
As machined, Electroplating, Passivation, Powder coating
Magnesium provides exceptional lightweight strength, high stiffness-to-weight ratio, and excellent thermal conductivity while maintaining good machinability. Its natural EMI shielding and biodegradability make it perfect for aerospace, automotive, electronics, and medical implants.
AZ31B, AZ91D, AZ61B, ZK61M, MB15-RE
As machined, Polishing, Sand Blasting, Tumbling, Alodine, Heat treatment, Anodizing, Teflon coating, Electroless nickel, Painting, Powder coating, Electrophoresis
Titanium offers unmatched strength-to-weight ratio, extreme corrosion resistance, and high-temperature stability while remaining highly machinable for precision components. Its biocompatibility and durability make it ideal for aerospace, medical implants, marine, and high-performance automotive applications.
Titanium Alloy TA1, Alloy TA2, Alloy TC4/Ti-6Al 4V
As machined, Polishing, Sand Blasting, Tumbling, Electropolish, Alodine, Anodizing, Electroless nickel, Painting, Powder coating, Brushed finish
POM (Delrin®) brings surgical precision to CNC machining—delivering stiffness rivaling aluminum, near-zero moisture absorption, and self-lubricating smoothness that outperforms metals in gears, rollers, and high-wear components.
Dark brown (coffee) POM 100AF, POM Black, POM Blue, POM White
As machined, Sand blasting, Tumbling, Painting
PE (Polyethylene) combines lightweight flexibility with high impact strength, excellent moisture resistance, and effortless machinability—ideal for fluid containers, chemical tanks, and medical packaging. Its chemical inertness (resists acids, alkalis, and solvents) and low-cost durability make it the workhorse of consumer goods, industrial liners, and food-safe applications.
HDPE, UHMW-PE, LDPE
As machined, Sand blasting, Tumbling, Painting, Powder coating
PMMA (Acrylic) shines with optical clarity (92% light transmission), glass-like rigidity yet half the weight, UV/weather resistance, and effortless thermoforming—a staple for lenses, displays, and outdoor signage. Though brittle, its scratch resistance and biocompatibility make it ideal for medical devices, LED optics, and architectural glazing where aesthetics meet endurance.
PMMA Black, PMMA Transparent, PMMA White
As machined, Sand blasting, Tumbling, Painting
ABS combines high impact resistance, toughness, and good thermal stability with excellent machinability and surface finish potential. Its chemical resistance and affordability make it ideal for automotive parts, consumer electronics, prototypes, and industrial housings.
ABS Beige(Natural), ABS Blac, ABS Black Antistati, ABS Milky Whit, ABS+PC Black, ABS+PC White
As machined, Sand blasting, Tumbling, Teflon coating, Painting, Powder coating, Electrophoresis
PC (Polycarbonate) offers exceptional impact resistance (250x stronger than glass) while maintaining optical clarity, lightweight versatility, and easy machinability—perfect for medical devices, safety gear, and automotive lenses. With high thermal stability and resistance to acids/alcohols, PC thrives in environments demanding transparency and rugged durability, from electronics to bulletproof glazing.
PC Black, PC Transparent, PC White, PC Yellowish White, PC+GF30 Black
As machined, Sand blasting, Tumbling, Painting, Brushed Finish
PEEK (Polyetheretherketone) boasts aerospace-grade strength—retaining stiffness at 250°C, resisting hydrolysis and aggressive chemicals, while machining like high-performance metal—perfect for oil & gas valves, spinal implants, and semiconductor parts. This “liquid metal” of plastics delivers unmatched wear resistance, sterilization stability, and weight savings for extreme environments from deep-sea robotics to jet engines.
PEEK Beige(Natural), PEEK Black
As machined, Sand blasting, Tumbling, Painting, Powder coating
FR4 delivers superb mechanical strength, high electrical insulation, and impressive heat resistance while remaining remarkably easy to machine or fabricate for PCB applications. Its flame-retardant properties and dimensional stability make it the backbone of circuit boards, electrical enclosures, and high-voltage insulation components.
FR-4 Aqua Green, FR-4 Yellow
HDPE offers high strength-to-density ratio, excellent impact resistance, and moisture-proof stability while being easily machined, welded, or thermoformed. Its chemical resistance and low-cost durability make it ideal for fluid storage tanks, corrosion-resistant piping, food-grade containers, and outdoor industrial components.
HDPE Black, HDPE White
As machined, Sand blasting, Tumbling, Painting, Powder coating, Teflon coating
PA (Nylon) combines high tensile strength, wear resistance, and low friction with excellent fatigue endurance, making it easy to machine for bearings, gears, and structural parts. Its chemical resilience and thermal stability ensure reliable performance in automotive components, industrial machinery, and consumer goods exposed to oils and solvents.
PA(Nylon) Blue, PA6 (Nylon)+GF15 Black, PA6 (Nylon)+GF30 Black, PA66 (Nylon) Beige(Natural), PA66 (Nylon) Black
As machined, Sand blasting, Tumbling, Teflon coating, Painting, Powder coating
PAI (Polyamide-Imide) delivers extreme heat resistance (up to 260°C long-term), unmatched mechanical strength, and dimensional stability—even when machined into precision bearings, seals, or aerospace components. Its self-lubricating properties and resistance to fuels, solvents, and acids make it the top-tier choice for demanding applications in aerospace, automotive, and oil & gas industries.
PAI 4203, 4503, 4301, 4501
As machined, Sand blasting, Tumbling, Heat Treatment, Teflon Coating, Painting
PET offers a rare trifecta: CNC-machinable like aluminum yet 10X lighter, with chemical resistance that laughs off acids/oils while meeting FDA food-contact standards – perfect for aerospace housings, medical device components, and solvent-washed industrial jigs.
PET Black, PET White, PET+GF30 Black, PET+GF30 White
As machined, Sand blasting, Tumbling, Teflon Coating, Painting
PP battles corrosive chemicals and flexes without fatigue—boasting chemical resistance stronger than stainless steel in acid/alkali environments, yet CNC-machines into living hinges and snap-fits that outlast 100,000+ cycles in medical fluid containers and automotive battery housings.
PP Black, PP White, PP+GF30 Black
As machined, Sand blasting, Tumbling, Painting, Powder coating
PPS laughs in the face of 220°C heat and aggressive chemicals—delivering CNC-machined parts with near-zero moisture absorption, UL94 V-0 flame resistance, and warp-free stability perfect for under-the-hood automotive connectors, sterilization-proof surgical tools, and semiconductor wafer carriers.
PPS Black, PPS White, PPS+GF30 Black
As machined, Sand blasting, Tumbling, Teflon Coating, Painting
PTFE defies friction with the lowest coefficient of any solid (0.05-0.1), laughs at 260°C molten aluminum while remaining chemically inert to every acid—including aqua regia—yet mills into self-lubricating seals and non-stick labware that outperform stainless steel in semiconductor wafer carriers and FDA-compliant food processing.
Teflon (PTFE) Black, Teflon (PTFE) White
As machined, Sand blasting, Powder coating, Brushed finish
| CATEGORY | Metal (Tightest Practical) | Plastic (Tightest Practical) | Notes |
|---|---|---|---|
| Linear Dimensions | ±0.002 ~ ±0.005 mm | ±0.01 ~ ±0.02 mm | Plastics affected by creep & thermal expansion |
| Diameter | ±0.002 ~ ±0.005 mm | ±0.01 ~ ±0.02 mm | Boring / precision turning required |
| Precise Hole | IT6–IT7 (≈±0.003 mm) | IT8–IT9 (≈±0.01 mm) | Plastics often need inserts |
| Angular Dimensions | ±0.01° | ±0.05° | Fixturing dominates accuracy |
| Surface Roughness | Ra 0.2 ~ 0.4 μm | Ra 0.8 ~ 1.6 μm | Plastics not ideal for ultra-low Ra |
| Straightness | 0.002 ~ 0.005 mm | 0.01 ~ 0.02 mm | Long/slender plastic parts are unstable |
| Flatness | 0.003 ~ 0.01 mm | 0.02 ~ 0.05 mm | Plastics prone to warping |
| Roundness (Circularity) | 0.002 ~ 0.005 mm | 0.01 ~ 0.02 mm | Achieved by fine turning/grinding |
| Cylindricity | 0.005 ~ 0.01 mm | 0.02 ~ 0.05 mm | Composite form error |
| Parallelism | 0.005 ~ 0.01 mm | 0.02 ~ 0.05 mm | Depends on datum stability |
| Perpendicularity | 0.005 ~ 0.01 mm | 0.02 ~ 0.05 mm | Fixturing critical |
| Position (True Position) | ⌀0.01 mm | ⌀0.05 mm | CNC + precise datums |
| Concentricity | 0.005 ~ 0.01 mm | 0.02 ~ 0.05 mm | Often replaced by runout |
| Symmetry | 0.01 mm | 0.05 mm | Difficult to inspect |
| Circular Runout | 0.003 ~ 0.005 mm | ~0.02 mm | Rotational accuracy |
| Total Runout | 0.005 ~ 0.01 mm | 0.03 ~ 0.05 mm | Most demanding tolerance |
| Design Aspect | Recommended Values / Parameters | Recommended Values / Parameters |
|---|---|---|
| Internal Corner Radius | R ≥ 0.5 × tool diameter (typically ≥ 2–3 mm) | End mills are round; sharp internal corners require smaller tools, increasing cost and time |
| Pocket Depth-to-Width Ratio | Depth ≤ 4 × width (preferred ≤ 3:1) | Deep narrow pockets cause tool deflection and chatter |
| Hole Depth-to-Diameter Ratio | Through hole ≤ 10:1; blind hole ≤ 5–8:1 | Deep holes are difficult to drill accurately and evacuate chips |
| Minimum Thread Size | ≥ M3 (steel), preferably M4 or larger | Small threads increase risk of tap breakage and assembly issues |
| Minimum Wall Thickness | Aluminum ≥ 1.5–2 mm; Steel ≥ 2.5–3 mm | Thin walls vibrate, deform, and reduce dimensional accuracy |
| Geometric Tolerances | Non-critical areas ≥ 0.05 mm | Tight tolerances significantly increase machining cost |
| Surface Roughness | General machining: Ra 3.2–6.3 μm | Ra ≤ 1.6 μm usually requires fine finishing or grinding |
Choose us for precision, speed, reliability, and expert-driven manufacturing solutions.
We are flexible with order quantities and have no minimum order requirement. Whether you need a single prototype or large production runs, we can accommodate your needs. Our CNC machining service starts from as low as 1 piece.
Our standard lead time for CNC machining projects is typically 4-7 working days from order confirmation to delivery. However, the exact timeline can vary based on several factors: Part complexity, Material selection, Order quantity, Current production schedule, Shipping destination.
At DirectProto, we work with a wide range of materials including aluminum, steel, stainless steel, copper, brass, and various plastics (PEEK, Delrin, ABS, etc.). Let us know your material needs and we'll confirm availability.
At DirectProto, our CNC machining capability achieves tolerances of up to ±0.02mm (0.0008") for standard parts, with tighter tolerances available upon request based on specific requirements.
Yes, we provide material certificates (MTR/COA) and detailed inspection reports including dimensional reports, CMM data, and other quality documentation as requested for all orders.
The price varies depending on material cost, quantity, processing requirements and shipping terms - please share your detailed specifications and target quantity, and we'll provide a competitive quote within 24 hours.
Yes, we accept all major CAD formats including STEP, IGS, DWG, SolidWorks, and PDF files. Please send us your drawings and we'll review them right away.
Yes, we offer comprehensive surface treatment options including anodizing, plating, painting, powder coating, and other finishes - please specify your requirements and we'll confirm the exact process and pricing.
Our CNC milling capacity is up to 4m x 2m, and our CNC turning capability handles diameters up to 500mm with lengths up to 2m. Please send your drawings and we'll confirm if it's within our manufacturing range.
Yes, our experienced engineering team provides comprehensive DFM support and design optimization suggestions to improve manufacturability and reduce costs while maintaining product functionality.
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