CNC Machining Services


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3ERP provides a variety of online CNC machining services including milling, turning, EDM, wire EDM and surface grinding. With precision 3-, 4- and 5-axis CNC machining centers, combined with other advanced capabilities and our experienced team, we can handle all types of CNC machining parts in both metal and plastic materials. Whatever you need prototypes or production parts, our CNC machining service will be your best choice. Request your online quote today to get your machining parts done in as fast as 5 days!

CNC Machining Processes

cnc milling service

CNC Milling

CNC milling services utilize 3-, 4-, & 5-axis milling machines with various of cutting tools to remove materials from solid plastic and metal blocks into final parts with different geometries as designed.

cnc turning service

CNC Turning

CNC turning is a more efficient method to manufacture round shaped components from plastic and metal bars or tubes, such as shafts, worms. Combines with live tooling, milled geometries can be done in the meantime.

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Why Choose Us for Custom CNC Machining?

The Top 3 Reasons:


Our engineers have built up rich, deep experience from many previous projects, so they can handle complex and precision parts in several industries without a problem.

Advanced Equipment
Advanced Equipment

3ERP has extensive in-house equipment for both manufacturing and testing. Your parts will be manufactured and inspected with our advanced in-house equipment, including HAAS 3-, 4-, and 5-axis CNC milling, Hexagon CMM, and Olympus XRF analyzer

Fast Turnaround
Fast Turnaround

On average we return quotes within 24 hours, parts ship within 7 days or less, and we have a 99% on-time delivery and quality rate.


See why our customers love us

I took a risk using 3erp, as I hadn't used them before. I sent them some very challenging, high-tolerance, CNC machined parts (some with machining from six sides), with some really small details.
We were blown away by the quality and accuracy of the parts. Bella was quick to respond to my emails, well into the night, and we received the parts back in a short timeframe. We really couldn't have been happier with the service. I would gladly recommend them to anyone.

Mike E - Director of Product Development
Mike E
Director of Product Development

We have been ordering CNC parts from 3ERP for over 5 years. Their quality and services are way better than what we can get from the other Chinese CNC machine shops. We always receive a fast quotation after we send through RFQs. Normally, within 12 hours or shorter which helps a lot. The projects we receive from 3ERP, both materials and geometry are always 100% matched every time. We are more than happy to stick to their services in long term.

Mark Peterson - Outsourcing Manager
Mark Peterson
Outsourcing Manager

We came across 3ERP when the first time we try to outsource CNC machining parts from China. They came back with a price, lead time, and suggestions in 5 hours. Seriously, I was shocked by their fast reaction and professional idea to improve the design. First-order was running super smoothly. We have been working with them for a lot of projects now. Their quality is always as expected or even better, and they deliver every project on the dot as well as good communication. I won't hesitate to recommend 3ERP to any of my friends if they need CNC parts.

Project Manager Darko
Darko S
Project Manager

I worked with another Chinese machine shop for eight years, and while the relationship was initially great, I eventually became disappointed by quality issues, late delivery and complete lack of communication. So I decided to give 3ERP a chance with a small order. Not only did they deliver on schedule, they did it with 100% accuracy and attention to detail. It was the same with my next order. They have exceeded all my expectations: they are a pleasure to work with; they respond to my inquiries by the next day (often within hours) and do whatever it takes to meet my requirements. This is what working with a machine shop should be like.

Devin W Vice President
Devin W
Vice President

Supported Materials & Finishes for our CNC Machining Services

If you are considering manufacturing your parts with CNC machining, it is important to know what kind of materials and finishes can be applied to your CNC machined parts. 3ERP, located in China, is not just a CNC shop; we can also apply all types of finishes to CNC prototype parts and production parts thanks to our surface finishing partners. Need custom CNC parts with a high-quality appearance? 3ERP is here to help.

CNC Materials

CNC Materials

Plastic: ABS, PC, ABS+PC, PP, PS, POM, PMMA (Acrylic), PAGF30, PCGF30, Teflon, DHPE, HDPE, PPS, PEEK. Learn More about our Plastic Machining Services

Metal: Aluminum, Steel, Stainless Steel (17-4, Inconel 625 & 718), Magnesium, Titanium, Zinc, Brass, Bronze, Copper. These are the most common materials for CNC prototyping and production parts. Besides that, we can work with any type of machinable plastic and metal we can purchase from the stock market. Review More Materials & Finishes Options

What’s more: We are able to create a custom plastic block or bar for the material such as PA GF50, PPS GF50. To discover further plastic materials we can do, please contact our team.

CNC Finishes

CNC Finishes

As-Machined: The most popular and cost efficient way for inner functional components. Fine and even tool path is also good for aspect parts.

Bead Blasted: The part is left with a matt appearance. Range of 120 to 320 beads allows us to create different roughness to the surface.

Anodized: Type II creates a corrosion-resistant finish. Parts can be anodized in different colors—clear, black, red, and blue are most common—and is usually associated with low silicone element series of 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.

CNC Machining Tolerances

With a wide range of CNC machines, we are able to provide stand tolerance CNC machined parts with the most economic price and super precision machined parts for the high-end products. When working with 3ERP, we guarantee all parts will be made accordingly to your specification. If 2D drawings are not available, you can also indicate with ISO 2678 as well. Click to review the table of the ISO 2678 tolerance standard.

 Tolerance Lever Overall Dimension Range
 Specifications  <<3, >0.5 <<6, >3  <<30, >6 <<120, >30  <<400, >120 <<1000, >400 <<2000, >1000
Tolerance Standard 
F  ±0.05  ±0.05  ±0.1  ±0.15  ±0.2  ±0.3  ±0.5
M  ±0.1 ±0.1 ±0.2  ±0.3 ±0.5  ±0.8 ±1.2
C ±0.2  ±0.3  ±0.5  ±0.8 ±1.2 ±2  ±3
V  – ±0.5 ±1  ±1.5 ±2.5 ±4 ±6

Aside from standard tolerance CNC parts such as ISO2678M or ISO2678F, 3ERP also offers high-precision CNC machining parts. With high precision milling & turning machines, we are able to catch super tight tolerance for prototype machining & production. After being in the manufacturing industry for over 10 years, we discovered a simple formula to produce precision parts Precision machines + Precision heart = Precision parts. 3ERP has a wide range of CNC machines and experienced engineers who never compromise with tolerance or part quality.

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How Does Our CNC Machining Service Work?

4 Simple Steps

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Upload a CAD File

To start, simply fill in a few information and upload a 3D CAD file.

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Quote & Design Analysis

You'll receive an online quote shortly, and we'll send you design for manufacturability (DFM) analysis if necessary

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Order Confirmation

Once you review the quote and place your order, we'll start the CNC manufacturing process, and surface finishing afterward as well if needed

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Parts are Shipped!

Your CNC prototypes or production CNC machining parts will be inspected and delivered straight to your doorstep


Applications of CNC Machining

Design & Rapid PrototypingMold MakingAerospaceAutomotiveMedicalConsumer Products
design and rapid prototyping Design & Rapid Prototyping

Design & Rapid Prototyping

Regardless of the manufacturing process used to create the end-use part, our CNC machining service is widely used by designers as a means of creating early and late-stage prototypes with short turnarounds times. CNC prototyping allow designers to rapidly iterate ideas without tooling costs or waiting times. It is one of the best ways to create concept model and function prototype to verify the design. Compared with other rapid prototyping methods, rapid CNC machining allows us to get tight tolerance prototypes in real materials fast.

CNC Prototyping is the preferred option to bring new design life among the other rapid prototyping methods, unless the products are designed for 3D printing or other methods only.

Typical CNC Machining Parts That We Offer

We machine custom parts for customers in multiple plastic and metal materials, from rapid prototypes,
low-volume production to mass production orders.

machining aluminum parts
machining aluminum
machining stainless steel
machining brass
Machining Acrylic
Machining Delrin
ABS Machining Prototype
CNC machined aluminum reflector

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Overview: What's CNC Machining?

What is CNC machining?

CNC machining is a manufacturing technique for removing material. It uses sharp cutting tools, available in a variety of shapes and sizes, which are precisely controlled by a computer. CNC stands for Computer Numerical Control.

How does our CNC machining service works?

CNC machining starts with a computer, on which designers prepare a part using CAD (Computer-aided Design) software. This digital part is then converted into a format that can be recognized by a CNC machine.

Instructions are sent to the CNC machine in the form of  “G-Code” after which the machine can start cutting.

Most CNC machines have a “worktable” and work holding device to keep a block of material — known as the “workpiece” — in place. The worktable may or may not move, depending on the style of the machine.

When machining starts, the cutting tool makes contact with the workpiece, cutting away layers of material. The tool and/or workpiece is moved and/or rapidly rotated according to the G-Code instructions so that cuts are made in exactly the right places until the part is finished.

Different types of CNC machines that 3erp use

CNC machines include CNC mills, CNC turning machines (or lathes), CNC routers, and Electrical Discharge Machining (EDM) machines.

CNC mills have rotating cutting tools that are moved to different areas of the workpiece to make cuts and can be used to make many different pats. CNC lathes work the other way, rotating the workpiece against a stationary cutting tool, and are used to make cylindrical parts.

CNC routers are similar to CNC mills, but have less power and cannot cut the hardest materials. They can, however, be faster than CNC mills.

EDM uses electrical discharges (sparks) instead of a sharp cutting tool to cut material. No physical contact is made between the tool and the workpiece.

CNC machines are often defined by their number of axes. More axes mean they can move their tool and/or workpiece in a greater number of ways, giving greater cutting flexibility and the ability to make more complex parts in a shorter time.

CNC Machining FAQ

Why choose CNC machining?

CNC machining is a fast, accurate and versatile solution for making end-use plastic and metal parts in any quantity, without the need for investing in hard tooling or expensive set-ups. No matter how simple or complex the parts.

Can I get tight tolerances CNC parts from 3ERP?

3ERP is known as one of the best CNC machining companies in China in terms of quality, speed, and customer service. With high-quality CNC machines, we can easily achieve +/- 0.02mm of tolerance and can even get within +/- 0.01mm. But keep in mind that it can have an impact on the cost.

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