CNC Milling

Our CNC milling process produces custom prototypes and end-use production parts in as fast as 1 day. We use 3-axis milling and 5-axis indexed milling processes to manufacture parts from more than 30 engineering-grade plastics and metals.

Unionfab offer over 1,000 milling machines, which means we always have the capacity and very competitive prices.

It also means we can produce both complex prototypes and low-volume production runs of precision machined parts, in a broad range of metals and plastics and with many surfaces finishes too. It’s like having an entire supply chain team for free.

How CNC Milling  Works

CNC milling is a subtractive manufacturing process. It starts by fixturing a block of metal or plastic material inside the CNC mill. Using G-code, the CNC machine is programmed to rapidly mill out parts from the block of raw material. Our 3- and 5-axis CNC machines are equipped with various toolsets to maximize efficiency and production speed.

Machined plastic parts are left as-milled, which typically means they show visible tool marks. Some metal parts allow more finishing choices like anodizing and chromate plating. When the run is complete and your required surface finish is applied, parts are boxed and shipped shortly thereafter.

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CNC Milling

High-Quality Precision CNC Milled Parts

CNC milling is a form of subtractive manufacturing in which raw material is processed through the use of computer-controlled, automated machinery.

Using advanced CNC milling machines, we produce high-quality parts for a wide range of applications in the aerospace & defense, automotive, electronics, and other demanding industries.

Our technicians are highly-skilled operators and our organizational focus on quality and customer satisfaction at every level enables us to produce the precision parts you require for your project.

Why Make your CNC Milling at Unionfab?

  • Endless Options Choose from millions of possible combinations of materials, finishes, tolerances, markings, and certifications for your order.
  • Easy to Use Get your parts delivered right to your door without the hassle of sourcing, project management, logistics, or shipping.
  • Vetted Network We are ISO 9001:2015 certified and AS9100D compliant. Only the top shops that apply to become Suppliers make it through our qualification process.

Design Guidelines: CNC Milling

Maximum Dimensions (3-axis milling)
Maximum Dimensions (5-axis milling)
Minimum Dimensions
Finish Options
US Metric
10 in. x 7 in. x 3.75 in. 254mm x 177.8mm x 95.25mm
10 in. x 14 in. x 1.75 in.* 254mm x 356mm x 44mm*
22 in. x 14 in. x 0.75 in.* 559mm x 356mm x 19mm*
22 in. x 14 in. x 3.75 in.** 559mm x 356mm x 95.25mm**
US Metric
2.6 in. x 2.9 in. x 3.9 in. 66mm x 73mm x 99mm
SIZE 0.25 in. x 0.25 in. 6.35mm x 6.35mm
NOMINAL THICKNESS 0.040 in. 1.02mm
PLASTIC Edges broken with visible tool marks
ALUMINUM Edges broken with visible tool marks, edges broken with light bead blast, or sharp edges with visible tool marks
ALL OTHER METALS Edges broken with visible toolmarks or edges broken with light bead blast

Recommended text considerations for CNC milling:

  • Plastic and soft metals: Minimum width of 0.018 in. (0.457mm), depth of 0.0118 in. (0.3mm).

    Example text size would be 16 point Arial Rounded MT font.

  • Hard metals: Minimum width of 0.033 in. (0.838mm) and depth of 0.0118 in. (0.3mm).

    Example text size would be 22 point Arial Rounded MT font.

  • If design permits it, opt for recessed text versus raised.

CNC Milling Material Options

Nylon 66

Nylon 66


Nylon 66 is a type of polyamide or nylon. It, and nylon 6, are the two most common for textile and plastic industries. Nylon 66 is made of two monomers each containing 6 carbon atoms, hexamethylenediamine and adipic acid, which give nylon 66 its name.


Nylon 6/6 is one of the most versatile engineering thermoplastics. It is popular in every major market using thermoplastic materials. Because of its excellent balance of strength, ductility and heat resistance, nylon 6/6 is an outstanding candidate for metal replacement applications. Nylon 6/6 is very easy to process with a very wide process window. This allows it to be used for everything from complex, thin walled components to large thick walled housings




Tensile Strength, Yield (MPa)
Elongation at Break (%)
Hardness (Shore D)
Heat Deflection Temperature (°C)
Melting Point (°C)

Multi Color

Acrylic is a tough material that has numerous benefits over glass. For one, acrylic can be easily machined whereas glass cannot. This gives you the option of CNC machining in acrylic when the task requires both complex geometry and high levels of optical clarity in the final part. Acrylic’s clarity makes it ideal for inspection windows, chemical testing hardware, and instrumentation covers.

Stainless Steel 316

Stainless Steel 316


Tensile Strength, Yield (MPa)
Shear Modulus (GPa)
Elongation at Break (%)
Hardness (Brinell)
Density (g/cm^3)


This austenitic grade of stainless steel contains molybdenum which gives it excellent corrosion resistance. In addition to this, it is highly formable and weldable. Applications include chemical tanks and boat fittings. The low carbon version, 316L, is more resistant to chlorides than the basic formulation.

Compare our 3D Printing Services

Service Lead Times Materials Tolerances Max Part Size
SLA 1 – 3 days Resin / Somos +/- 0.003 in. 800 x 800 x 550 mm
SLS 2 – 5 days PA12/ PA12GB +/- 0.002 in. 350 x 350 x 400 mm
MJF 2 – 5 days PA12/ PA12GB +/- 0.002 in. 380 x 280 x 380 mm
FDM 2 – 5 days PLA / ABS  +/- 0.003 in. 500 x 500 x 400 mm
Poly Jet 2 – 5 days Resin +/- 0.003 in. 490 x 390 x 200 mm

CNC Milling Cases

  • August 18, 2021

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  • August 18, 2021

    3D Printing creates a stylish environment test1

    Dine at Tarukai Luxury Club; not only can it arouse appetite and detonate taste buds.It’s a multiple feasts of smell…

    Learn More
  • August 11, 2021

    3D Printing creates a stylish environment

    Dine at Tarukai Luxury Club; not only can it arouse appetite and detonate taste buds.It’s a multiple feasts of smell…

    Learn More