The Xometry app works best with JavaScript enabled!
Xometry Logo
Sign In
Search
CapabilitiesIndustriesResourcesSuppliesBecome a Supplier
CNC

CNC Machining

Other Services

CapabilitiesCNC Machining ServicesCNC Milling Service

CNC Milling Service

CNC Milled Prototypes and Production Parts in as Fast as 1 Day | AS9100D | ISO 9001:2015 | ISO 13485 | ITAR Registered | Free Standard Shipping on All US Orders

Materials
Applications and Benefits
Tolerances
About CNC Milling
Download Guide

High Quality Rapid CNC Milling

Xometry integrates seamlessly with over 5,000 qualified manufacturing partners, including US-based ITAR qualified and AS9100D registered CNC milling facilities. That massive network means that whatever your part, we have a shop and a machine that can make it. We support 3-axis, 4-axis, 5-axis milling, and right angle milling capabilities to help you rapidly create designs from simple straight lines to complex geometric shapes. Xometry offers instant pricing, on-demand lead times, and design-for-manufacturability feedback on materials and manufacturing processes for your custom CNC milled parts, no matter your industry. Get your instant quote today.

CNC Machining Materials

Materials Available at Xometry
AluminumBronze/BrassCopperPlasticsSteel / Titanium / Zinc
Aluminum

Aluminum 5052

Bronze/Brass

Brass C360

Copper

EPT Copper C110

Plastics

ABS

Steel / Titanium / Zinc

Alloy Steel 4130, 4140

Aluminum

Aluminum 7075 & 7075-T6

Bronze/Brass

Brass 260

Copper

Copper 101

Plastics

Acetal [Delrin]

Steel / Titanium / Zinc

ASTM A36

Aluminum

Aluminum 6063-T5

Bronze/Brass

C932 M07 Bearing Bronze

Copper
Plastics

Acrylic

Steel / Titanium / Zinc

Stainless Steel 15-5, 17-4, 18-8, 303

Aluminum

Aluminum 7050-T7451

Bronze/Brass
Copper
Plastics

G-10 Garolite

Steel / Titanium / Zinc

Stainless Steel 303, 304, 316/316L

Aluminum

Aluminum MIC-6

Bronze/Brass
Copper
Plastics

Nylon 6/6

Steel / Titanium / Zinc

Stainless Steel 416, 420

Aluminum

Aluminum 6061-T6

Bronze/Brass
Copper
Plastics

PEEK

Steel / Titanium / Zinc

Steel, Low Carbon

Aluminum

Aluminum 2024-T3

Bronze/Brass
Copper
Plastics

Polycarbonate

Steel / Titanium / Zinc

Steel A36

Aluminum
Bronze/Brass
Copper
Plastics

PTFE [Teflon]

Steel / Titanium / Zinc

Titanium Grade 2, Titanium 6Al-4V, Zinc Sheet Alloy 500

Aluminum
Bronze/Brass
Copper
Plastics

Polypropylene

Steel / Titanium / Zinc
Aluminum
Bronze/Brass
Copper
Plastics

Ultra-High Molecular Weight Polyethylene

Steel / Titanium / Zinc

Additional alloys and tempers are available upon request. We can source to your project specifications. Review more information about our materials here.

Custom Sourced Materials

A variety of CNC machined metal and plastic part options are available for an instant online quote. If you do not see the material stock you are looking for, please choose "Custom" under the material drop-down on your quote page and submit for an expert engineering review once you have specified features, tolerances, inspection needs, and quantities required.

Available 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 media blasted, typically using glass bead, to produce 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.

CNC milling services at Xometry

Ready to get started on your CNC milling quote?

Applications of CNC Milling

Rapid tooling

Rapid Tooling

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

Fast parts and fast shipping

Rapid Prototyping

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

Part Production

End-Use Production

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

Advantages of CNC Milling

CNC machined parts
Rapid Turnaround
CNC machined parts

Using the latest CNC machines, Xometry produces highly accurate, quick turn parts in as fast as 1 day. We also instantly quote CNC machined parts, cutting days off of your RFQ process.

High Precision Tolerances
CNC machining

Offers high-precision tolerances ranging from +/-0.001″ – 0.005″, depending on customer specs. We are the experts in making parts that are truly custom and ready to use.

Scalability
machined parts stacked up

CNC Machining is perfect for prototyping and production production parts. Xometry's massive scale can help you scale up from testing phase to production runs of 100,000 parts of more.



Material Selection
raw aluminum

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

CNC Milling Tolerances & Standards

DescriptionGeneral Tolerance or Standard
Description

Maximum Part Size

General Tolerance or Standard

Milled parts up to 80” x 48” x 24” (2,032 x 1,219 x 610 mm).

Description

Distance Dimensions

General Tolerance or Standard

For features of size (Length, width, height, diameter) and location (position, concentricity, symmetry) +/- 0.005”.

Description

Orientation and Form Dimensions

General Tolerance or Standard

0-12" +/- 0.005", Angularity 1/2 degree. For 24" and beyond please consult Xometry's Manufacturing Standards.

Description

Precision Tolerances

General Tolerance or Standard

Xometry can manufacture and inspect to tight tolerances per your drawing specifications including GD&T callouts.

Description

Minimum Feature Size

General Tolerance or Standard

0.020” (0.50 mm). This may vary depending on part geometry and chosen material.

Description

Threads and Tapped Holes

General Tolerance or Standard

Xometry can accommodate any standard thread size. We can also machine custom threads; these will require a manual quote review.

Description

Surface Finish

General Tolerance or Standard

The standard finish is as-machined: 125 Ra or better. Additional finishing options can be specified when getting a quote.

Description

Edge Condition

General Tolerance or Standard

Sharp edges will be broken and deburred by default. Critical edges that must be left sharp should be noted and specified on a print.

Please check out Xometry's Manufacturing Standards for more information on tolerances per process. Unless we have agreed to other tolerances in your Quote, we will work to achieve and hold the tolerances noted.

Overview: What is CNC Milling?

The Basics Of CNC Mills

CNC mills are automated cutting machines using a rotating spindle-head to cut away unwanted material. CNC milling machines come in a variety of sizes and different axis configurations. They are mainly utilized to cut harder metals but can work with workpiece materials ranging from plastic and aluminum to stainless steel and titanium.


How CNC Milling Works

CNC mills excel at profile cutting harder materials. Like all CNC machines, a CNC mill is controlled with G-Code created through CAM software. The Gg-Code instructs the machine where to move the tool head, how fast to spin the tool, how deep to cut, how to move the workpiece, and other factors relating to speed, feed rate, and coordination. The G-Code complexity depends on how many axes the milling machine has.


Mills can still be used for profile cutting of softer materials, but are not as cost-effective for that use as CNC routers. The main difference between these machines is that with a CNC router the workpiece remains stationary while the router cutting head is directed around the piece, while a CNC mill may move both tool head and workpiece. CNC mills are mainly used in industrial manufacturing, while CNC routing is more common for lower output manufacturing like woodworking.

CNC machined parts
Types of CNC Mills
3-Axis

The most widely used type of CNC milling machine. The full use of the X, Y, and Z directions makes a 3 Axis CNC mill useful for a wide variety of work.

4-Axis

This type of router allows the machine to rotate on a vertical axis, moving the workpiece to introduce more continuous machining.

5-Axis

These machines have three traditional axes as well as two additional rotary axes. A 5-axis CNC router is, therefore, able to machine 5 sides of a workpiece at in one machine without having to remove the workpiece and reset. The workpiece rotates, and the spindle head is able to also move around the piece. These are larger and more expensive.

Other Benefits Of CNC Milling

CNC milling machines are built for precise manufacturing and repeatability which makes them perfect for rapid prototyping and low-to-high volume production runs. CNC mills can also work with a variety of materials from basic aluminum and plastics to more exotic ones like titanium — making them the ideal machine for almost any job. Learn more about the difference between a mill and a lathe and when milling is the best process to use.

    CNC Milling

    Why Choose Xometry for CNC Milling?

    Massive Network Capacity

    Endless Options

    Choose from millions of possible combinations of materials, finishes, tolerances, markings, and certifications for your order.

    Instant Quoting Engine

    Easy to Use

    Get your parts delivered right to your door without the hassle of sourcing, project management, logistics, or shipping.

    Guaranteed Quality

    Vetted Network

    We are ISO 9001:2015, ISO 13485 and AS9100D certified. Only the top machine shops that apply to become Suppliers make it through our qualification process.

    Xometry Image

    Download the CNC machining design guide