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Custom CNC Milling Services

CNC milled prototypes and production parts in days | AS9100D | ISO 9001:2015 | ISO 13485 | ITAR Registered | Free standard shipping on all US orders

Materials
Applications and Benefits
Tolerances
About CNC Milling
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High Quality Rapid CNC Milling Service

Xometry integrates seamlessly with over 10,000 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.

    Use the 3D viewer above to preview Xometry’s part rendering features.

    Custom 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 custom CNC milled parts, including metal and plastic, 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 CNC machining costs 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 machining capabilities, 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 processes are perfect for prototyping and production CNC 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 Machines offer 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. This manufacturing process is 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 Mill Machining Processes

    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

      Instant Quote Demo

      See how simple it is to get an instant quote for CNC machining using the Xometry Instant Quoting Engine®.


      Why Choose Xometry for Custom 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 CNC machine shops that apply to become Suppliers make it through our qualification process.

      Xometry Image

      Download the CNC machining design guide