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  • CNC Machining

Precision CNC Machining for Metals & Plastics

Get high-accuracy, production-ready parts with ProtoMandi’s CNC Milling & Turning services. We specialize in tight-tolerance components made from a wide range of metals and plastics.

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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
Process Rotating tool cuts stationary workpiece Rotating workpiece cut by stationary tool
Best for Flat surfaces, pockets, 3D profiles Cylindrical parts, shafts, pins
Tool Paths 3-axis, 4-axis, 5-axis 2-axis or live tooling (3+ axes)
Example Parts Brackets, housings, jigs Bushings, 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
Aluminum 6061, 7075 310–550 Enclosures, brackets Lightweight, corrosion-resistant
Steel MS, SS304, SS316 400–900 Tools, shafts, frames High strength, durable
Brass CZ121 ~350 Bushings, aesthetic parts Good machinability, non-sparking
Copper C110 ~210 Heat sinks, electrical parts Conductive, soft material

Plastics

Material Common Forms Strength/Flexibility Applications Notes
Acrylic Sheets, blocks Rigid, brittle Transparent covers, panels Optically clear, scratch-prone
Bakelite Laminated sheets Hard, heat-resistant Jigs, insulators Electrically insulating, brittle
Delrin (POM) Rods, sheets High stiffness, low friction Gears, bushings Excellent dimensional stability

Choosing the Right Material

  • Aluminum 6061: Best all-rounder for general prototyping.
  • Aluminum 7075: For aerospace-grade strength.
  • SS304: Corrosion-resistant and weldable.
  • SS316: Better for marine or chemical environments.
  • Brass: Ideal for decorative or low-friction parts.
  • Delrin: Best for wear components like sliders.

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 Thickness Min 0.8 mm (plastics), 1 mm (metals)
Hole Diameter ≥1 mm
Thread Depth ≤3× diameter
Corner Radius ≥1 mm for internal corners
Tolerance Fit ISO 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"