CNC Milling part

CNC Milling Service

Get custom milled parts for rapid prototyping and production.


ISO 9001:215 | AS9100D | ITAR Registered

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. With machined production parts, you can also get more competitive pricing at higher quantities in addition to first article inspection (FAI) reporting, material certifications, and additional finishing options like anodizing and chromate plating. 

Our CNC milling service is commonly used for:

  • functional prototypes
  • jigs and Fixtures
  • production components in lower volumes

two milled metal parts

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CNC Machining Design Guide

In this guide to CNC machining, you'll learn how to create efficient, manufacturable metal and plastic parts for prototyping and production.

CNC Milling Design Guidelines and Capabilities

Our basic guidelines for CNC milling include important design considerations to help improve part manufacturability, enhance cosmetic appearance, and reduce overall production time. View our design guidelines page for more details.

CNC Milling Materials

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

cnc milled aluminum part



Anodizing and Chromate Plating Specifications

Anodize Hard Anodize Chromate

MIL-A-8625 Type II, Class 2 (Blk)

MIL-A-8625 Type II, Class 1(Clr)

MIL-A-8625 Type III, Class 2 (Blk) MIL-DTL-5541 Type II, Class 3 (Clr)

Quick-turn Finishing

Here are the requirements to get parts in as fast as 4 days (1-day expedite + 3 days for plating):

  • Aluminum 6061/6082 and 7075 material eligibility
  • Threaded holes plugged
  • No masking available

High-requirement Finishing

Have AS9100 and ITAR requirements? Try our domestic precision machining option. If you have more complex anodizing and plating requirements, work with our digital network of manufacturers. The network works well for components that require a specialized color or material option such as titanium or nickel.   

Surface Finish on Milled Parts

Typically, we break (debur) the edges on all machined parts. All machined plastic parts are left as-machined, which may leave visible tool marks. Some metal parts, on the other hand, allow more choice. Parts left with sharp edges should be handled with care.

black cnc milled part

ABS Black

Finish: Broken edge

ABS Natural CNC Milled Part

ABS Natural

Finish: Broken edge

Aluminum CNC Part with Broken Edges


Finish: Broken edge

cnc milled aluminum part with bead blast finish


Finish: Bead Blast

aluminum milled part with sharp edges


Finish: Sharp edge


Tour our Digital Machine Shop

Take a quick tour through our 215,000 sq. ft. CNC machining facility in Minnesota to see how we manufacture parts in as fast as 24 hours. 

What is CNC Milling and How Does it Work?

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.