CNC Machining Services

Unparalleled precision for producing metal and plastic parts

How Does CNC Machining Work?

CNC (Computer Numerical Controlled) Machining is a means to remove material using high speed, precision machines that use a wide variety of cutting tools to create the final design. Common CNC machines include vertical milling machines, horizontal milling machines, and lathes. Complex cylindrical shapes can be manufactured more cost effectively using a CNC lathe versus a 3 or 5-axis CNC milling machine. With a CNC lathe, the part stock turns while the cutting tools remain stationary. Conversely, on a CNC mill, the cutting tools move while the stock remains fixed. To create the geometry of a part, the CNC computer controls the rotational speed of the stock as well as the movement and feed rates of the stationary tools. If square features are needed on an otherwise round part, the round geometry is first created on the CNC lathe followed by the square features on a CNC mill. To successfully make a part on a CNC Machine, programs instruct the machine how it should move. The programmed instructions given to the CNC machine are encoded using CAM (computer aided manufacturing) software in conjunction with the CAD (computer aided design) model provided by the customer. The CAD model is loaded into the CAM software and tool paths are created based on the required geometry of the manufactured part. Once the tool paths are determined, the CAM software creates machine code that tells the machine how fast to move, how fast to turn the stock and/or tool, and where to move in a 5-axis X, Y, Z, A and B coordinate system.

Why Work With Xometry For CNC Machining?

We combine the latest CNC machining and turning processes with proprietary technology to deliver high quality, on-demand parts. Our typical tolerance accuracy ranges from +/-0.001" to +/-0.005" for metal and +/- .002" to +/- .010" for plastic, depending on customer specs. Please see our Manufacturing Standards for more details.


CNC Machining Services

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Applications

Rapid Tooling

Because CNC machining services can be applied to virtually any material, it is perfect for rapid tooling, i.e., creating fixtures or molds.

Rapid Prototyping

The range of materials available, low cost per unit, and speed of production makes CNC a great option for prototyping.

End-Use Production

High-quality finish, vast material options and precise tolerances have made CNC machining a favorable technology for end-use parts.

Advantages

Rapid Turnaround

Using the latest CNC machines, Xometry produces highly accurate parts in as little as 6 business days.

Scalability

CNC Machining is perfect for production of 1-10,000 parts.

Precision

Offers high-precision tolerances ranging from +/-0.001″ – 0.005″, depending on customer specs.

Material Selection

Choose from over 50 metal and plastic materials. CNC Machining offers a wide variety of certified materials.

Custom Finishes

Select from a variety of finishes on solid metal parts, built to precise design specifications.

Materials

Metals

  • Aluminum
  • Brass
  • Bronze
  • Copper
  • Magnesium
  • Stainless Steel
  • Steel
  • Titanium
  • Zinc

Plastics

  • Acetal (Polyoxymethylene (POM)) [Delrin]
  • Acrylonitrile Butadiene Styrene (ABS)
  • G-10 Garolite [Fiberglass]
  • Polycarbonate (PC)
  • Polyether Ether Ketone (PEEK)
  • Polyetherimide (PEI) [Ultem]
  • Polyethylene (PE)
  • Polymethyl Methacrylate (PMMA/Acrylic)
  • Polytetrafluoroethylene (PTFE) [Teflon]
  • Polyurethane (PU)
  • Polyvinyl Chloride (PVC)

Finishes

As-Milled

The finish option with the quickest turnaround. Parts are left with visible tool marks and potentially sharp edges and burrs, which can be removed upon request. Surface finish is comparable to 125 uin Ra finish.

Bead Blast

The part surface is left with a smooth, matte appearance.

Anodized (Type II or Type III)

Type II creates a corrosion-resistant finish. Parts can be anodized in different colors—clear, black, red, and gold are most common—and is usually associated with aluminum. Type III is thicker and creates a wear-resistant layer in addition to the corrosion resistance seen with Type II.

Powder Coat

This is a process where powdered paint is sprayed onto a part which is then baked in an oven. This creates a strong, wear- and corrosion-resistant layer that is more durable than standard painting methods. A wide variety of colors are available to create the desired aesthetic.

Custom

Don’t see the finish you need? Submit an RFQ and we’ll look into a finishing process for you.

Processes

Multi-Axis CNC Milling Centers

  • 5 Axis Machining
  • 4 Axis Machining
  • 3 Axis Machining
  • Right Angle Milling

See more on CNC Milling

CNC Lathe and Live Action Tooling

  • Dual Spindle Lathes

See more on CNC Turning

Wire EDM available upon request


CNC Design Guide

CNC Design Guide

CNC machining is one of the fastest ways to build functional prototypes, product molds, low to high volume production runs, and fixtures.

Learn how to design your parts for CNC machining to ensure high quality and cost-effective results. Download your free guide today.

Download Guide