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What is CNC milling?

CNC milling is a computer-controlled subtractive machining process that uses rotating cutting tools to remove material from a solid, stationary workpiece to create custom-designed parts. During milling, the workpiece is cut along multiple axes to obtain a variety of shapes and geometries.

Our CNC milling services are simple: Upload your CAD files to our online instant quote system to get a quote, work with us to optimize your design and select your materials, then get your project into production quickly and efficiently.

Our CNC milling services

Our CNC machining capabilities include both 3-axis, and 5-axis mills:

3 Axis CNC Milling

A profitable and efficient solution to your CNC milling needs! We ensure the machining of parts with complex geometrical shapes, including undercut features, threaded holes, sharp edges, and planar profiles. Complete multiple operations through effective integration with an automatic tool changer. We can also design 3-axis milling centers to meet the unique requirements of each client.

4 Axis CNC Milling

Get more complex CNC milled parts with our 4-axis CNC milling. We consistently produce precise and accurate results, with greater control and more flexibility, even with complex shapes. Ensure cost-effective machining of angled features that are rather impossible with 3-axis machines. With more power, greater control, and higher precision, 4-axis milling is your ideal solution.

5 Axis CNC Milling

Machine complex custom CNC milled parts with a single setup. Our 5-axis CNC milling machines save time, improve efficiency, and reduce cost, ensuring that you meet market demands faster and cost-effectively. We can reach higher cutting speeds without excessive pressure on the cutter. Get rapid prototypes and low-volume production parts with better surface finishes.

Why Choose Us for CNC Milling Service

At Rapid-MFG, we are committed to helping you reach your manufacturing goals. We constantly strive for effective solutions through our progressive technological approaches and machining techniques. Our CNC milling services ensure you get highly precise prototypes and production parts with superior quality.

  • Excellent design precision
  • Production consistency
  • Suitability for niche products
  • Established technology
  • Wide variety of materials
  • Scalability
  • Speed
  • Upfront design costs
  • Limited part geometry
  • Potential unused material waste

Design considerations

The Rapid-MFG CNC milling process takes your project from prototype to production quickly and simply. Optimize your milled parts with the following design considerations, material choices, and finishing and post processing options:

CNC milling general process information

  3-Axis Milling 5-Axis Milling
Maximum part size​ 1800 x 1000 x 500 mm 70.9 x 39.4 x 19.7 in 1000 x 900 x 600 mm 39.4 x 35.4 x 23.6 in
Minimum part size 12.7 x 12.7 x 12.7 mm 0.5 x 0.5 x 0.5 in 12.7 x 12.7 x 12.7 mm 0.5 x 0.5 x 0.5 in
Minimum feature size Ø 1 mm Ø 0.039 in Ø 1 mm Ø 0.039 in
Standard tolerance Metals: +/-0.13 mm (0.005 in) Plastics: +/-0.20 mm (0.008 in)  
Minimum wall thickness Recommended size: 0.8 mm (0.031 in) for metals and 1.5 mm (0.059 in) for plastics Feasible size: 0.5 mm (0.019 in) for metals and 1.0 mm (0.039 in) for plastics  
Holes Recommended size: Diameter: standard drill bit sizes Depth: 4 x diameter Feasible size: Diameter: Ø 0.5 mm (0.019 in) Depth: 8 x diameter  
Threads Recommended size: Size: M6 or larger Length: 3 x diameter Feasible size: Size: M2.5  
Lead time As low as 8 days for less than 50 parts As low as 10 days for less than 50

CNC Milling Materials

We stock more than 30 production-grade plastic and metal materials that are suitable for various part applications and industries.

CNC milling materials
Plastic Aluminum Stainless Steel Other Steel Other Metal
ABS 2024 303 Mild steel Brass
Nylon 6 6061 304 Alloy steel Copper
Acetal (Delrin) 6082 316 Tool steel Titanium
Polycarbonate 7050 17-4   Contact us for additional
metal machining options
PVC 7075 420    
PTFE (Teflon)        
Nylon 30%GF        

Surface Finishes for CNC Milling

Gain access to quality surface finishing for custom CNC milling parts to remove aesthetic flaws and improve the appearance of your products. We also provide rigid protection and additional resistance and strength to your parts through superior surface finishes.

  Anodizing Anodizing improves corrosion resistance, enhancing wear resistance and hardness, and protecting the metal surface. Widely used in mechanical parts, aircraft, and automobile parts, precision instruments, etc. Aluminum Clear, black, grey, red, blue, gold. Smooth, matte finish. Learn More>>

Bead Blasting

Bead blasting results in parts with a smooth surface with a matte texture. Used mainly for visual applications and can be followed by other surface treatments.

ABS, Aluminum, Brass, Stainless Steel, Steel

n/a Matte Learn More>>
  Powder Coating Powder coating is a type of coating that is applied as a free-flowing, dry powder. Unlike conventional liquid paint which is delivered via an evaporating solvent, powder coating is typically applied electrostatically and then cured under heat or with ultraviolet light. Aluminum, Stainless Steel, Steel

Black, any RAL code or Pantone number

 Gloss or semi-gloss

Learn More>>

  Electroplating Electroplating can be functional, decorative or corrosion-related. Many industries use the process, including the automotive sector, in which chrome-plating of steel automobile parts is common.

Aluminum, steel, stainless steel




Smooth, glossy finish


Learn More>>


Polishing is the process of creating a smooth and shiny surface, either through physical rubbing of the part or by chemical interference. The process produces a surface with significant specular reflection, but in some materials is able to reduce diffuse reflection.

Aluminum, Brass, Stainless Steel, Steel



Learn More>>



Brushing is a surface treatment process in which abrasive belts are used to draw traces on the surface of a material, usually for aesthetic purposes.

ABS, Aluminum, Brass, Stainless Steel, Steel

n/a Satin

Learn More>>

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