High-Quality
CNC Milling Parts

Parts in days anywhere in the USA.

Our CNC Milling services offer:

Quality Matters  |  AS9100D Certified, ISO 9001:2015, ISO 13485:2016, & ITAR Registered

Certifications and Registrations

* Not all locations have all certifications and registrations. Parts requiring these will be made at facilities with the correct certifications and registrations.

Prototek's CNC Machine Shop Services offer CNC Milling
Table of Contents

What is CNC Milling?

Computer Numerical Control (CNC) milling has become an increasingly popular manufacturing method across various industries. This technology uses computerized controls and rotating cutting tools to shape metal, plastics, wood, and composites. The benefits of CNC milling include improved consistency, repeatability, and the ability to work with complex shapes and designs. CNC mill machines are particularly well-suited for use in the aerospace, automotive, medical, and electronics industries due to their ability to produce precise parts according to programmed procedures and specifications. With this technology, manufacturers can create highly accurate and consistent components, essential in applications where safety and reliability are critical.

How does CNC Milling work?

The customer submits a CAD drawing of their project, and our engineers convert the CAD model into a CNC program using CAM software. The CNC machine is then prepared with the correct cutting objects, and the material is fastened to the work table by a vice. The part’s requirements, specifications, and complexity will determine the type of milling machine. When ready, the machinist will use the computer interface to read the code and create the component. The device removes material from the blank with rotating cutting parts until the desired piece is revealed. After this process, the part will be further completed in our finishing department according to specifications.

Types of Milling Machines at Prototek

Vertical Milling: Vertical milling operation involves a drill press and tooling rotation that primarily works vertically. A typical vertical CNC milling machine has three axes where the tooling moves vertically.

Horizontal Milling: Horizontal and vertical milling machines have a similar principal function. However, horizontal milling involves tooling that spins horizontally. These two different milling machines use a similar type of tooling.

3-Axis CNC Milling: In 3-axis milling, the part remains motionless while the cutting tool mills along three different axes. 3-Axis milling machine applications include contoured shapes, hole features, and sharp edges.

4-Axis CNC Milling: With 4-axis milling, the machine operates on multiple axes, with an additional rotation around one of the axes. This extra rotation is called the A-axis. It is used to create cut-outs on the side of a workpiece.

5-Axis CNC Milling: 5-axis milling machines utilize all four axes of 4-axis machining plus an additional rotational axis (B-axis). They can produce complex parts for various industries.

9-Axis Milling: A 9-axis milling machine is similar in basic capabilities to the 5-axis machine but includes angle milling, balance turning, and more. 9-axis machines use both the B-axis and additional tools to create complex parts.

Vertical CNC Milling Machine - Line Drawing
horizontal cnc milling machine illustration

CNC Milling at Prototek

OEM:

Akira Seiki, Atrump, Bridgeport, Brother, Daewooo, DMG Mori, Doosan, Haas, Hurco, Kent USA, Lagun, Matsuura, Mazak, OKK, Sharp, Sodick

Lead Time:

5 – 22 Days 

Max Dimensions:

84 x 34 x 30 in (2133.5 x 863.5 x 762 mm)

Prototek has many machines with different dimensions. This is the largest dimension available.

Material:

Metals: Aluminum, Bearing Bronze, Brass, Bronze, Carbon Steel, Copper, Phosphor Bronze, Silicon Aluminum Bronze, Stainless Steel, Steel, Titanium

Plastics: ABS, Acrylic, Acetal, HDPE, Nylon, PEEK, Polycarbonate, Polypropylene, Radel, Ultem

Types of Mills:

Vertical Mill, Horizontal Mill, 3-Axis, 4-Axis, 5-Axis, 9-Axis

Prototek's Materials

Metal Components machined near me
Metals

Metal materials suitable for CNC milling include aluminum, brass, bronze, copper, stainless steel, and mild steel. Aluminum is the most commonly used metal due to its excellent machinability, lightweight, and corrosion resistance. Brass and bronze are often used for their aesthetic appeal and durability. Copper is ideal for conducting electricity and heat, while stainless steel offers high strength and resistance to corrosion. Mild steel, while not as strong as stainless steel, is affordable and versatile, making it a popular choice for low-cost applications. The selection of the appropriate metal will depend on the intended application, budget, and desired properties. It is essential to consult with a materials expert to determine the best metal for a particular project.

We offer many metal alloys and grades. To determine which is best for your project, check out the link below.

Machined Plastics
Plastics

Plastic materials are widely used in CNC milling due to their cost-effectiveness, versatility, and ease of machining. Some of the most commonly used plastic materials for CNC milling include ABS, acrylic, polyethylene, polycarbonate, and PVC. These materials have varying physical and chemical properties, meaning they can be adapted to various applications in industries such as automotive, aerospace, and electronics. CNC milling plastic materials enables precision and accuracy in producing complex shapes and parts. Some benefits include high-quality surface finishing, the ability to create intricate designs, and fast turnaround times. However, it’s essential to choose a suitable plastic material for the application to ensure the desired properties, such as strength, chemical resistance, or temperature tolerance, are met.

To see a list of our most commonly used plastic materials, click the link below.

Design Recommendations

Designing parts for CNC milling involves several key considerations to ensure successful manufacturing. The first step is selecting the appropriate materials to use for the part, taking into account factors such as strength, stability, and cost. The design should also consider the part’s geometry and ensure that it can be machined using the CNC milling process. This involves designing features like pockets, holes, and fillets that can be quickly produced with CNC milling tools.

In addition, the design should consider the ranges and surface finish requirements of the final part. Accurate measurements and precise machining techniques are essential to meet the requirements. The number of setups required during machining should also be minimized to reduce costs and possible errors.

Overall, designing parts for CNC milling requires engineering expertise and a practical understanding of the manufacturing process. By optimizing the design for CNC milling, the resulting parts can be produced more efficiently and accurately, leading to higher-quality products and improved production efficiency.

Feature Recommended Feasible Minimum

Cavities and Pockets

d < 4w

10ø of the tool

Engraving

0.2 in
Font Size: ≥ 20 pt Sans Serif

Holes

ø = Standard Drill Bit Sizes
d > 4ø


d ≤ 10ø

Internal Edges

Corner: r > 1/3 d

Minimum Features

0.10 in

0.02 in

Thin Walls

Metal: 0.03 in
Plastics: 0.06 in

Metal: 0.02 in
Plastic: 0.04 in

Threads

Length: 3ø
Size: 0-80

Tolerances

± 0.005 in

Undercuts

Width: 0.125 in - 1.5 in
Max Depth: < 2w
Min Clearance: > 4d

w (width)  |  d (depth)  |  r (radius)  |  ø (diameter)  |  in (inches)  |  ± (plus or minus)  |  < (less than)  |  ≤ (less than or equal to)  |  > (greater than)  |  ≥ (greater than or equal to)  |  M# (standard thread size)

Feature Recommended Feasible Minimum

Cavities and Pockets

d < 4w

10ø of the tool

Engraving

5 mm
Font Size: ≥ 20 pt Sans Serif

Holes

ø = Standard Drill Bit Sizes
d > 4ø


d ≤ 10ø

Internal Edges

Corner: r > 1/3 d

Minimum Features

2.5 mm

0.5 mm

Thin Walls

Metal: 0.8 mm
Plastics: 1.5 mm

Metal: 0.5 mm
Plastic: 1.0 mm

Threads

Length: 3ø
Size: ≥ M6



Tolerances

± 0.125 mm

Undercuts

Width: 3 mm - 40 mm
Max Depth: < 2w
Min Clearance: > 4d

w (width)  |  d (depth)  |  r (radius)  |  ø (diameter)  |  mm (millimeter)  |  ± (plus or minus)  |  < (less than)  |  ≤ (less than or equal to)  |  > (greater than)  |  ≥ (greater than or equal to)  |  M# (standard thread size)

CNC Milling Finishes

Choose the right finish for your CNC milling project to achieve your part’s desired look and functionality. Options include anodizing, paint, powder coating, plating, and polishing. Anodizing offers a protective and decorative oxide layer, while paint and powder coatings protect from corrosion and wear and provide various colors and finishes. Plating adds a metallic coating, and polishing removes imperfections for a smooth and reflective surface. To make the right choice for your project, consider the part’s function and aesthetic and talk to a professional for guidance.

CNC Machining Finishes
Why choose Prototek for your next CNC milling project?

Prototek offers a wide range of services to help you with your CNC milling project, making it an excellent choice for your next project. Our state-of-the-art equipment can precision machine parts within tight tolerances, ensuring exceptional accuracy and quality throughout the fabrication process. Additionally, our experienced team of engineers and technicians is dedicated to delivering excellent service, offering guidance and assistance at every process step. We pride ourselves on providing fast turnaround times, giving you the flexibility to meet even the tightest deadlines. Ultimately, Prototek’s dedication to quality and customer satisfaction makes us an excellent choice for anyone looking for a reliable, high-quality partner for their CNC milling project.

What do our customers say about us?
They are competitively priced for their services and a very personable team to work with. If you haven't used them - do it! You'll have a lifelong vendor you be happy with that repeatedly goes above and beyond what is asked.
Product Designer
We are extremely happy with the quality of the parts as well as the level of service - thanks!
VP Product Designer