CNC machining, or Computer Numerical Control machining, is a subtractive manufacturing
technology that cuts the workpiece from a block of material. This technique involves using
tools operated through a program commonly known as G-code. The program guides the
activity and functioning of the CNC machine in the formation of the required shape of the
part. These are some of the CNC machines: the multi-axis CNC milling machines, the lathes,
also known as the turning machines, and the routers. While all these machines use computer
instructions for subtractive manufacturing, their working is different.
For example, in CNC milling machines, the workpiece is fixed while the cutter moves to cut
the material. On the other hand, CNC turning machines have the cutting tool in a fixed
position while the workpiece rotates for the cutting tool.
Custom Online CNC Machining Services
High Precision Machined Parts
You can get an instant online quote for your metal or plastic CNC machined parts, from
concept design to rapid prototyping and production. They have more than one hundred types
of materials and more than sixty choices for the surface treatment of the products. All our
services are offered under quality management systems of ISO 9001:2015, ISO 13485, ISO
14001:2015, and IATF 16949:2016. Obtain lead times of as short as one day for your
projects, so that you can finish your work at the earliest.
CNC Machining Services for Custom Parts
The state-of-the-art milling centers and the turning equipment provide accurate machining
with 0.001-inch tolerances. Our specializations include turning, milling, drilling, boring, and
grinding, while our CNC routing, EDM machining, and precision grinding are some of the
specialized services. These additional capabilities are helpful for designers and product
developers who want to design new products and use high-quality custom parts. Regardless
of the size of the project that you have, our fully equipped machine shops are ready to deliver
your order on time and to the highest quality. The essential custom-machined parts can be
delivered in one day, solving your time and financial constraints.
Custom CNC Milling Services
CNC Milling
CNC milling is a process that employs computer numerical control technology to control the
movement of the cutting tool, which usually is a rotating cutter that cuts out blocks of metal
or plastic to obtain the required shapes. This technique is applied in manufacturing
complicated parts with high accuracy since it cuts the time required.
● Tolerances: They are as close as +/- 0. 001 inches, which makes their sizes and
quality standard.
● Applications: Applicable in the prototype and production stage since it allows the
creation of complex and detailed parts.
● Turnaround Time: Quick turn-milling services are helpful in the production of parts and delivery to meet the time needed.
Custom CNC Turning Services
CNC Turning
CNC turning is the turning of metal rod stock using CNC lathes and turning centers, and it is
mainly related to cylindrical turned products. It also ensures that parts get to the correct
dimension and has a smooth surface finish.
● Precision: Can achieve accuracies of up to +/- 0. 0005 inches and gives high
accuracy and details for the reproduction of the work.
● Applications: It can be used in prototyping and production to help make accurate and
identical parts.
● Turnaround Time: Turn services help deliver parts on time because they have a short
turnaround time.
CNC Machining Materials
CNC materials that are available with us include a variety of metals and plastics that can be
used in the same. This means that you can choose the suitable material for your custom cnc
machined parts, thus making the part work as required and have a long life cycle.
Metals
CNC Steel Machining
● Aluminum: Low density, high strength, ease of fabrication, and excellent corrosion
resistance. Suitable for the aerospace and automotive industry. The strength and the
ability to machine also differ across the alloys; some popular ones are Aluminum
6061, 2024, 5052, 5083, 6063, 6082, 7075, and ADC12 (A380).
● Copper: High electrical and thermal conductivity. Applicable to electrical parts and
heat exchangers.
● Brass: Corrosion resistant, good machinability. Ideal for plumbing and electrical
installations in structures.
● Bronze: Excellent wear resistance and fair machinability. They are applied in bearings
and bushing.
● Steel: Durable, tough. Relevant to numerous manufacturing procedures.
● Stainless Steel: Excellent resistance to corrosion and high strength. It is ideal for
medical, food, and sea-related businesses.
● Magnesium: Quite lightweight but very sturdy. They are used in aerospace and
automotive industries where the density of the material has to be reduced.
● Titanium: High strength-to-weight ratio, noncorrosive. Found in aerospace, medical,
and high-performance vehicles industries.
Plastics
CNC Plastic Machining
We provide a variety of plastic materials for CNC machining, each with unique properties
suited to different applications. Our available plastic materials for CNC machining include
the following with specific characteristics for each:
● ABS: Impact resistant, hardness. It is most often used in the automotive industry and
consumer electronics.
● PC (polycarbonate): Good impact strength and transparency. It is used primarily in
optical and medical applications most of the time.
● PMMA (Acrylic): Clear, waterproof. It is mainly used in sign writing and the production
of display boards.
● POM (Polyoxymethylene): High stiffness, low friction. Best suited for use in precision
mechanical parts.
● PA (Nylon): Good mechanical properties and chemical resistance. Common in gears
and bearings.
● PE (Polyethylene): Chemical resistant, hard wearing. Used in the containers and
packaging.
● PEEK (Polyether Ether Ketone): Good mechanical characteristics, chemical proof. It is
used in aerospace engineering and the medical sciences.
● PP (Polypropylene): Chemical resistant, flexible. Polyethylene has been used in
packaging and automotive parts, among others.
● HDPE (High-Density Polyethylene): Resistant and has good blow molding
characteristics. Commonly used in pipes and containers.
● HIPS (High-impact polystyrene): Good impact resistance and machinability. Used in
the electronics industry and food packaging.
● LDPE (Low-Density Polyethylene): Chemical resistant all around. Used in the making
of plastic bags and films.
● PBT (Polybutylene Terephthalate): Robust, non-elastic, heat resistant. Most often
used in electrical parts and housing. It is available in black and the natural color,
milky white.
● PPA (Polyphthalamide): Possess good mechanical properties and is chemically
stable. Used in automotive and industrial applications.
● PAI (Polyamide-imide): Firm and heat tolerant. It is used in aerospace and
electronics.
● PET (Polyethylene Terephthalate): Good mechanical properties and chemical
resistance. Used in the packaging and cloth industries.
● PPS (Polyphenylene Sulfide): Chemical and heat resistant. Used in car and electronic
industries.
● PS (Polystyrene): Lame, obvious, strict. Used in the production of bags and eating
● PVC (Polyvinyl Chloride): Chemically immune, very wear resistant. Used in pipes and
construction products.
● PTFE (Teflon): Low abrasion, excellent chemical resistance. Used in seals and
gaskets.
● UPE (Ultra-high-molecular-weight Polyethylene): High wear resistance, low friction.
Used in the production of bearings and conveyance systems.
● Bakelite: Electrical insulation characteristics, heatproof. Used in electrical
components.
● FR-4: Fiberglass Epoxy Laminate is used in constructing PCBs. Most often used in
printed circuit boards.
The variety of materials and high-tech equipment ensures compliance with the needs of any
work and the production of accurate parts as quickly as possible.
CNC Machining Tolerances
CNC Tight Tolerance Machining
In the case of CNC machining, the aspects that relate to the size of the part, time to delivery,
accuracy, and surface finish are essential in precision engineering. For milled parts, the
maximum size is 80 inches in length, 48 inches in width, and 24 inches in height, or 2032mm
x 1219mm x 610mm. The maximum size for lathe parts is 62 inches in length (1,575 mm)
and 32 inches in diameter (813 mm).
The standard lead time for CNC machined parts is usually 3 business days to help meet
project deadlines. Typical manufacturing tolerances for metal parts are usually within +/- 0.
005 inches (0. 127 mm) as defined in ISO 2768 unless otherwise stated. Plastic and
composites keep The tolerance at +/- 0. 010 inches.
For projects that need more accuracy, CNC machining can deliver closer tolerances, to sub
+/- 0. 001 inches, based on the drawing standards and GD&T notes included in the drawing.
The smallest dimension of a feature that can be produced with acceptable dimensional
accuracy is 0. 020 inches (0. 50 mm), but this can be changed according to the geometry of
the part and the material that has been chosen.
Regarding threads and tapped holes, any thread size is possible. Custom threads can also be
machined, though they may be quoted after a manual process. Edges of the parts are usually
broken and deburred because sharp edges are dangerous and may hinder proper
functioning.
CNC Machining Design Guidelines
CNC Machining Design
Some basic guidelines should be observed when designing parts for CNC machining to
reduce time and costs. Internal corner fillets should be made as close to 0 as possible
because the closer the value is to 0, the stronger and more durable the structure will be. 020”
to 0. It is also observed that the radii are “050” more than the standard drill size for the radii.
A drill diameter-to-depth ratio of 1:6 is advised, but 1:4 is preferred.
When it comes to the floor fillets, they should be made slightly thinner than the corner ones
so that the same cutting tool can be used for the interior. Undercuts are required to a
standard size and should be positioned so the cutting tool can reach them conveniently.
When using tapped or threaded holes, ensure the tool has a little extra length beyond the depth of the tapped hole to guarantee all threads are formed. To minimize the cost of CNC machining, avoid taking many minor cuts and only include the necessary functional and aesthetic details. This also avoids the formation of too many constraints that complicate the design and increase the costs.
Advantages of CNC Machining
Precision Engineering
Computer numerical control machining is a process of manufacturing where the use of a
computer dominates the process to a significant degree. Tolerances can be as low as +/- 0.
This code “001” gives a quality and standard finish to the geometries and designs, which are
in complex form.
Versatility in Material Handling
A significant strength of CNC machining is that it can operate on almost any material,
including aluminum, stainless steel, some alloys, and plastics, such as nylon and
polycarbonate. It suits several industries, such as aerospace, automotive, and medical
devices.
Efficiency and Automation
CNC machines only require programming; once programmed, they can work independently
at any time of the day. It also assists in the reduction of labor costs as well as in the
management of the prototyping and production runs.
Challenges in CNC Machining
Programming Complexity
Cnc machines need to be controlled, and this is done through programming. Technicians
with adequate knowledge of translating design specifications into machine language should
handle this technical process. This process is susceptible, and much care must be taken to
avoid the wrong tool paths and get the best ones.
Initial Setup and Calibration
Another aspect of CNC programming is the tool, fixture, and work-holding device generation
for the CNC machine, depending on the job. This initial setup phase is crucial for the
accuracy of the results, but it may consume a lot of time and money, mainly when the
production is custom or low volume type.
These are the two major factors that influence the manufacturing process: the material
limitations and the tool wear.
CNC machining can be done on any material, but some alloys or composites may be
complex due to their hardness, heat tolerance, or abrasiveness. Additionally, the machining
process takes a long time, and the tools used become blunt, and they need to be
re-grounded and replaced to regain a sharp edge.
Applications of CNC Machining
Prototyping and Iterative Design
CNC machining is essential in developing prototypes since it helps quickly produce the
designs as models. This iterative process benefits product development, where engineers
test their ideas and fine-tune their designs before going to production.
Customization and Small-Batch Production
CNC machining is most advantageous to manufacturers who require parts with complicated
cross-sectional profiles or manufacturers who require only a few quantities of parts. It
enables one to satisfy specific customers and new market demands where there is little time
for strategizing.
Complex Component Manufacturing
Some industries that use CNC machining include automotive, electronics, and tooling
industries since they are used in manufacturing complex parts with small features and
tolerances. This capability helps enhance product performance in various applications, thus
contributing to product innovation.
Why Choose Feitai for Custom CNC Machining Services?
Feitai is an organization that provides custom CNC machining services to engineers, product
developers, and designers. We guarantee our clients that we can offer them a one-stop
service from modeling to small and big-scale production. Here’s why Feitai stands out as
your ideal manufacturing partner.
Advanced Equipment and Technology
Feitai has the most efficient equipment: HAAS CNC mills and lathes, Hexagon CMMs, and
Olympus XRF analyzers. It also means that all the parts that the CNC produces have to be of
the right quality, in terms of the material used and size.
Expertise and Experience
Our engineers have decades of experience and knowledge from implementing successful
CNC machining projects in different fields. They are exceptionally proficient in handling
complex components made from Computer Numerical Control with slim margins of profit
and complex geometries to guarantee the accuracy and dependability of the outcomes in
every undertaking.
Quality Assurance
Among the existing companies, Feitai is one of the organizations that has woken up from the
realization that quality is a success factor. Quality control is also conducted on each of the
parts manufactured by CNC before the part is sold in the market. This ensures that all the
parts are produced to the right quality, do not have any vices, and are fit for your purpose.
Fast Turnaround and Capacity
We also consider time factors to ensure we complete the project on time. Feitai has its own
equipment and qualified staff to produce higher-quality fast service that can offer delivery
time, whether it is prototypes or manufacturing.
Conclusion
When you choose to get the services of Feitai CNC machining, you are guaranteed quality,
accuracy, and reliability at each step. See us today and discover the differences between our
CNC machining services based on your specifications.
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