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      • CNC Machining

      High-Precision CNC Machining

      Upload your CAD, get instant review & expert recommendations.
      STEP, IGES, STL supported. Fast, secure, and engineer-reviewed.

      Start Your CNC Project

      • 1 Upload File
      • 2 Get Review
      • 3 Receive Quote

      We support STEP, IGES, and STL formats — the most widely used and industry-standard file types for 3D printing, CNC machining, and rapid prototyping. Once your design files are uploaded, our engineering team thoroughly reviews them for dimensional accuracy, potential manufacturing issues, and functional integrity. We don’t just give you a price — we provide a comprehensive quote that includes detailed pricing breakdowns, suggested materials based on your part's application, and a manufacturability analysis to ensure your design is feasible for production.

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      Start A New CNC Machining Quote

      STEP | IGES | STL files
      All uploads are secure and confidential.
      Categories
      What is CNC Machining? Milling vs Turning Supported Materials Choosing the Right Material Tolerances & Finishes Design Guidelines Add-on Services Why Choose ProtoMandi?
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      What is CNC Machining?

      CNC (Computer Numerical Control) machining is a subtractive manufacturing process where pre-programmed tools remove material from a solid block ("workpiece") to form precise parts. It's ideal for parts requiring:

      • Tight tolerances (as low as ±0.01 mm)
      • High repeatability
      • Functional strength & durability
      • Complex geometries (especially with multi-axis milling)

      Milling vs Turning: What’s the Difference?

      Feature CNC Milling CNC Turning
      ProcessRotating tool cuts stationary workpieceRotating workpiece cut by stationary tool
      Best forFlat surfaces, pockets, 3D profilesCylindrical parts, shafts, pins
      Tool Paths3-axis, 4-axis, 5-axis2-axis or live tooling (3+ axes)
      Example PartsBrackets, housings, jigsBushings, rods, spacers

      Supported Materials

      We offer a wide range of metals and plastics suitable for prototyping and production.

      Metals
      Material Common Grades Tensile Strength (MPa) Applications Notes
      Aluminum6061, 7075310–550Enclosures, bracketsLightweight, corrosion-resistant
      SteelMS, SS304, SS316400–900Tools, shafts, framesHigh strength, durable
      BrassCZ121~350Bushings, aesthetic partsGood machinability, non-sparking
      CopperC110~210Heat sinks, electrical partsConductive, soft material
      Plastics
      Material Common Forms Strength/Flexibility Applications Notes
      AcrylicSheets, blocksRigid, brittleTransparent covers, panelsOptically clear, scratch-prone
      BakeliteLaminated sheetsHard, heat-resistantJigs, insulatorsElectrically insulating, brittle
      Delrin (POM)Rods, sheetsHigh stiffness, low frictionGears, bushingsExcellent dimensional stability

      Tolerances, Threads & Surface Finishes

      • Standard Tolerance: ±0.1 mm (custom: up to ±0.01 mm)
      • Threading: Metric and Imperial threads supported (internal and external)
      • Finishes:
        • As-machined (default)
        • Anodized (Color, Hard)
        • Powder Coating
        • Bead Blasting
        • Custom Painting
        • Engraving (Laser / CNC)
      • Visual Suggestion: Comparison of finish types using the same part.

      Design Guidelines for CNC Machining

      Feature Guideline
      Wall ThicknessMin 0.8 mm (plastics), 1 mm (metals)
      Hole Diameter≥1 mm
      Thread Depth≤3× diameter
      Corner Radius≥1 mm for internal corners
      Tolerance FitISO fits available on request
      Bonus Tips for Better Machinability:
      • Avoid deep pockets >6× depth:diameter ratio to reduce cost & tool chatter.
      • Use fillets on internal corners to reduce tool stress.
      • Avoid overhangs and undercuts unless necessary; they require specialized tooling or 5-axis setups.
      • Design parts to be easily fixturable (flat bases, fewer unsupported features).
      • Minimize thin, tall features that may vibrate or deflect.
      • If tapped holes are required, keep them away from edges to prevent cracking.

      Add-on Services

      • Anodizing (Type II & Type III)
      • Powder Coating (Glossy, matte, textured)
      • Laser Engraving (logos, part numbers)
      • Part Assembly (fitment, fastening)
      • Material Certification (on request)

      Why Choose ProtoMandi?

      • Built by engineers, for engineers.
      • CNC + sourcing + DFM in one platform.
      • Instant file uploads, responsive quoting.
      • The ProtoMandi Guarantee on all orders.
      • Early-stage feedback to catch design flaws before manufacturing.

      Supported File Formats

      • STEP (.stp/.step) (compulsory)
      • PDF (for 2D drawings / tolerances)

      From Prototype to Production

      Whether you need a one-off sample or a batch of 10,000 parts, we scale with your needs.

      Suggested Visual Layout for Developer

      • Hero Section: CAD file upload form + sample part image (machined aluminum bracket)
      • Process Section: Horizontal infographic for Milling vs Turning
      • Materials Section: Material grid w/ icons, strength, machinability
      • Design Guidelines Section: Simple DFM chart
      • Finishing Options Gallery: Swipeable or expandable part gallery
      • Sticky CTA bar: Always visible "Upload File for Quote"