3ERP - Your reliable partner for high-quality
custom CNC machining parts

Looking for a qualified, quick-turn CNC machining supplier? 3ERP is definitely a great choice for custom metal and plastic machined parts. We own two CNC machining factories, which are set up for rapid prototyping and production part machining. With 60+ CNC machines in-house and a network of over 30 verified CNC machining shops located in China, Mexico, Germany and the US, our manufacturing capacity is unlimited, which ensures your high-quality machined parts can be shipped on time for every project. Try our online CNC machining services today!

Our CNC Machining
Capabilities

We are always ready for the challenges of tight tolerances and complex CNC machined parts. Try out our precision CNC machining services and become our next satisfied customer.
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CNC Milling Service

With 32 sets of 5-axis CNC milling machines in-house which allows us to mill tight tolerance plastic and metal parts with complex geometries easily. And we also offer low-cost machined parts by using our 3-, 4-axis milling machines.

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CNC Turning Service

CNC turning is a more efficient method to manufacture round components from plastic and metal bars or tubes, such as worm shafts. When combined with live tooling, milled geometries can be achieved simultaneously.

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EDM & Wire-Cut Service

EDM and wire-cut is one of the CNC machining processes which uses copper, graphite pattern or molybdenum wire to achieve the design for sharp corners, undercuts and remove whatever un-needed material from workpieces. EDM is also widely used for rapid tooling and production mold making.

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CNC Grinding Service

If you need a super flat surface part, or round part that needs OD and ID +/- 0.005mm in tolerances, our CNC grinding machining service will be the best match of your production needs for such type of parts.

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Swiss Machining Service

Swiss machining is an efficient way to produce complex, or slender component. By moving both live tooling and the workpiece, we can always cut the material which is close to the workpiece holder. To avoid deformation compared to traditional CNC lathe.

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CNC Routing Service

Besides standard milling service for parts in engineering plastics or metals, we also offer CNC routing service for prototypes and parts in soft materials such as EPS foam, EVA, woods.

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50+
CNC
MACHINES
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ISO
9001:2015
CERTIFIED
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10K+
CNC PARTS
made MONTHLY
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100+
PLASTIC &
METAL MATERIALS

Why Choose Our
CNC Machining Service?

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Quality

Consistent High Quality

Our stringent quality management system guarantees consistently high quality. With full inspection of finished precision machined parts, you can expect your parts to be built to specification and free of defects.

Equipments

Advance Equipments

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

Experience

Experience

Our engineers have built up rich, deep experience from many previous CNC machining projects in several industries, so they can handle any type of tight tolerances CNC machined parts with complex geometries.

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.

A customer’s words mean more than ours see what our satisfied customers have said about how we fulfilled their requirements.
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CNC Prototypes and Parts
Made Easy

Get 7-day standard lead times on simple parts between 0.5 in. x 0.5 in. and 4 in. x 3 in.
Upload your part to see if it’s eligible.
01

Upload CAD file

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02

Quote & Design Analysis

Analysis
03

Order Confirmation

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Parts Shipped

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CNC Machining Tolerances, Materials & Surface Finishes

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Tolerances and Standards

With a wide range of CNC mills and lathes, we are able to provide standard tolerance CNC machined parts with the most economical price and CNC machining precision parts for high-end products. When working with 3ERP, we guarantee all parts will be made according to your specification. If 2D drawings are not available, you can also indicate with ISO 2768.

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Machinable Materials

Wide range type of industrial-grade CNC machining materials such as ABS, POM, PEEK, stainless steel, brass, copper and more can be used for custom parts, giving you lots of material selection options to complete prototypes and production runs of custom parts. Learn more about our plastic machining and metal machining.

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Surface Finishes

3ERP offers wide variety high level surface finishes such as bead blasted, anodized (type ii, type iii), chromed, powder coating, zinc plating, nickel plating. We only list some of the common surface finishing options. There are more surface finish options for CNC machined parts.

From Concept to Production

CNC machining is an ideal manufacturing process whether you need a few parts or 10000+ units as end-used production parts. Here are the custom CNC services available at 3ERP.

Rapid Prototyping

Prototype Machining

From 3ERP, you can get your CNC machined prototypes done in days, super shot lead times allows you to verify the design fast.

  • Instant quotes
  • Instant DFM feedback
  • Excellent quality
  • Short lead time
Low Volume

Low-Volume Machining

CNC machining is a cost-efficient way to make certain types of parts in small volume or medium quantity. For example, 100 pieces to 1000 pieces.

  • Lower cost
  • Production-level quality
  • Short lead time
  • Test out the market before investment
Production

Production Machining

Using CNC machines and robots is a best option for big volume production machining which allows us to avoid heavy labor. Decrease the cost significantly.

  • Experienced engineers for DFM optimization
  • A professional project manager working in your time zone
  • First Article Inspection
  • Guaranteed consistent quality
Put your parts
into production today
All information and uploads are secure and confidential.

CNC Machining for Various Industrial Applications

Our CNC machining service have been qualified by worldwide customers from different industries. We have been offering CNC machined parts for various industries which include the below list and more.

CNC Machining
FAQs

Yes. As soon as we receive your RFQ, our engineers will review the CAD files and offer the design feedback and optimization suggestion for CNC machining if needed. In order to get better CNC machined parts quality and sort out the points to lower the CNC machining cost which affect the unit price.

3ERP owns two CNC machining shops with over 60 sets of CNC milling and CNC turning machines. And we have more than 40 experienced technical experts, therefore we can guarantee to manufacture 5000 pcs different types of CNC machined parts in-house. Besides that, thanks to our verified manufacturing partners from our manufacturing network, we can offer extra CNC machined parts unlimitedly.

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.

Our production engineers review every RFQ we get from customers to make sure the material and CNC machining cost are calculated properly. The online CNC machining quotation system from most of the manufacturing platforms is not yet accurate enough. Read more about the case study.

First of all, make sure the parts are designed friendly for CNC machining process. For example, avoid the features like sharp corners, deep pocket and thin walk. Secondly, select the right CNC machining companies for your projects. For the simple, small parts, you can easily find the small CNC machine shops to make parts at a better price. If you need precision parts with complex geometries, then a CNC machining company like 3ERP who have precision multi-axis CNC mills and lathes and inspection facilities fits better.

Referring to our previous previous CNC machining orders, over 90% of them are finished in around 7 days. Simple CNC machined parts can be done within 2 days, while it might take 15+ days to make complex or big CNC machined parts. Quantity is another matter to be considered. From our CNC machining manufacturing networks, we can also machine your parts from our CNC machining shops which is close to your location in the US and Europe which shorter the shipping time.

More to Know About CNC Machining

What is CNC machining?

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

What are the different types of CNC machines?

At a CNC machining shop, CNC mills, CNC turning machines (or lathes), CNC routers, and Electrical Discharge Machining (EDM) machines, CNC grinding machines are commonly used.

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 parts.

CNC lathes work the other way, rotating the workpiece against a stationary cutting tool, and are used to make cylindrical parts.

Swiss Machines are similar to CNC lathes, instead moving the cutting tools, they move the workpieces. Small diameter round parts can be made without deformation.

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 complicated parts in a shorter time.

How Does CNC Machining Work?

CNC machining starts with a computer, on which designers prepare a part using CAD (Computer-aided Design) software. Then, the programmer will use CAM (computer-aided manufacturing) software such as HyperMill, PowerMill, Maxcam, UG to get the tools paths to the NC files which we can upload to the mills, lathes, or other machines to manufacture the parts.
Instructions are sent to the CNC machine in the form of “G-Code” after which the machine can read and 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.

Advantages of CNC
machining

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Here we present some of the main advantages of CNC machining compared to other manufacturing processes such as 3D printing, injection molding, urethane casting, laser cutting, plasma cutting, or other sheet metal fabrication processes.

Cost-efficient:

The CNC machining process is a high-speed manufacturing process for certain types of parts. CNC machines with a powerful spindle and good machine tools allow us to remove raw material fast. If the part geometry is simple (for example, a solid base plate which needs holes, threads, steps, or grooves) very small amounts of raw material are removed. In this case, the unit price for CNC machining will be much lower than 3D printing, because it would take many hours to print such a part.

More precise:

On a good CNC mill or lathe, the machine tolerance is +/-0.005 mm, and if we can remove 0.005 mm in the final cut from the workpiece, that means we can easily get parts machined with a +/-0.01 mm tolerance. Compare this to the 3D printing process, in which parts are printed layer by layer. The minimum layer height is 0.05 mm, which means the parts tolerance can’t be less than 0.05 mm.

Better for surface finishing:

Post-processing is always needed for cosmetic parts, so it is very important to achieve a good surface finish at the first stage. When the RPM of the CNC mill goes up to 15,000 and the CNC lathe up to 6,000, the CNC machined part surface roughness is less than Ra 0.8, which is good for bead blasted, painted, or anodized surfaces without sanding manually. Meanwhile for parts made from SLS, SLM, or DMLS processes, the surface roughness is far more than Ra 3.2.

More flexible part sizes:

A large CNC machine center can have a table measuring 6 m x 30 m or larger, which means that very big parts can be milled. And as far as we know, the biggest lathe was built with a maximum 5 m diameter. At the other end of the scale, with precise 5-axis CNC Mills and R0.05 mm cutting tools, we can mill a tiny geometry from a 1 mm x 1 mm x 1 mm block, while a Swiss machine can also be useful for making small parts for medical applications. 3D printing, urethane casting, die casting, and injection molding can’t achieve these extreme minimum and maximum part sizes.