What Is CNC Machining
CNC transforms a piece of material (metal, plastic, wood, ceramic, stone, or composite) into a specified shape by following coded programmed instructions and without a manual operator directly controlling the machining operation.
Advantages of CNC Machining
High Precision and Improved Accuracy
One of the most significant benefits of using CNC machining compared with manual operations is precision. It's possible to create parts that meet precise specifications without the need for constant attention from a skilled operator.
Endurance
Manual machining processes can only continue as long as there are skilled workers present to work the machines. The manufacturing process stops when workers take a break or go home at the end of their working day.
High Production and Scalability
After the operator has programmed the machine with the necessary design specifications, production can take place. Once the CNC machine has started a production run, creating parts takes no time at all.
Speed
Another of the numerous advantages CNC machining offers is its higher speed. When CNC machines are used, operators can be much more efficient because the machines can use their fastest settings. CNC machines can run 24/7 without running out of steam. They don't need a break for coffee or lunch. No holidays need to be booked or any kind of time off. There are no trade-offs with a CNC machine.
Enhanced Capabilities
A CNC machine usually has a rotating carousel that can carry up to 30 tools. These tools can be automatically swapped out during the milling and machining process.
Capable of producing even the most complex parts
The CNC machining process can create virtually any component you might think of. These machines can perform a wealth of fabrication and CNC milling operations, including shearing, flame cutting, punching holes, and welding metal sheets.
Wide Range of Materials Supported
CNC machines are compatible with a range of materials such as composites, metals, carving foam, rigid foam, phenolic materials, and plastics.
Less Dependability on Human Labor and Fewer Human Errors
CNC machines are precision turning machines that operate autonomously. No manual intervention is required, which bypasses the possibility of human errors.
Uniform Product and Design Retention
The input is immutable throughout the production process, no matter how many cycles are performed. Unless any changes are made deliberately, the final products are consistent.
Digital Simulations of Prototypes
Simulations of prototypes are possible using CNC machining and milling. This allows manufacturers to check the program's efficacy before it is put into full-time production mode.
Lower Costs
The initial price of a CNC machine may be costly but lower operational costs more than compensate for this. The high output rate, minimal mistakes, and low production costs of CNC machining make it cost-effective. Less training is required, which is a further cost saving. Operators can also learn how to use CNC machines virtually, eliminating the cost and need for training workpieces. All these factors make CNC machining very attractive.
Improved Safety
An operator only interacts with a CNC machine to enter the code and maintain the machine. Apart from that, the process is entirely automated. Operators don't have to put themselves near the cutting tools, which can improve the overall safety of the workplace.
Low Maintenance
The final point in the list of the many advantages of CNC milling machine technology is that it typically requires minimal levels of maintenance. Generally, the service involves changing the cutting implements at the indicated interval and a small amount of light cleaning. CNC machines are low maintenance, and any servicing can be performed in-house without needing professional maintenance engineers, which saves money.
Full Mobility Will Hit The CNC Industry
Just as an individual can now access the internet no matter where they might be, soon the potential for a completely mobile CNC machine will become a reality.
Currently, some CNC machines can be used at home to cut wood, plastic, and metal while sitting on a tabletop. In manufacturing facilities, CNC machines provide the ability to fully automate the process to address a complex project.
EXPERTS SUPPORT
Can't decide the printing technology and most suitable material for your project? Don't worry about it. We'll help you make your best 3D Printing project yet
INDUSTRIAL 3D PRINTERS
You will get access to high resolution industrial 3D Printing technologies without the cost that comes with it.
FULL-SERVICE 3D PRINTING
From your sketch, we will design, 3D print, clean and polish your 3D printed object. Need a metal finish or regular paint? We can do that too!
SUPERIOR QUALITY PRODUCTION
Get a smooth surface finish for your 3d printed parts or artwork.
QUICK TURNAROUND
Never stress about your project's deadline, we will get your 3D print parts in no time!
As you can see, there are lots of CNC machining advantages. If you're considering adding CNC machines to your manufacturing process, here are some of the reasons you may or may not want to:
CNC machining services require no extensive skills or experience
Products can be replicated thousands of times
Less labor is required to operate CNC machinery
CNC software makes your production options more versatile
With CNC machines, there is no need for prototypes
CNC machining fits the skills of modern workers
CNC machining uses oil-based coolants that result in a better quality finish
CNC machining services create lighter and stronger parts with the help of complex geometry
There are many CNC machining advantages compared with conventional machining. These include greater design freedom, higher accuracy, and finer features.
The Applications of CNC Machining in Different Industries
CNC machining has various applications in various manufacturing industries, including automotive, aerospace, medical, and electronics. CNC machines can produce high-precision parts and components used in multiple products, from engine blocks to surgical instruments
Automotive Industries
In the automotive industry, CNC machines produce parts that require tight tolerances and exact specifications, such as engine blocks, transmission housings, and suspension components. CNC machines can also create custom parts unique to a particular vehicle model.
Aerospace Industries
CNC machines produce aircraft, spacecraft, and satellite parts in the aerospace industry. These parts must be lightweight, durable, and withstand extreme conditions. CNC machines can create complex shapes and contours that cannot be achieved with traditional machining methods.
Medical Industry
CNC machines produce surgical instruments, prosthetics, and implants in the medical industry. These parts must be precise and reliable to ensure patient safety. CNC machines can have parts with intricate designs and tight tolerances essential in medical applications.
Electronics Industry
CNC machining is an indispensable technology in the electronics industry, used to produce a wide range of electronic components and devices with high precision and accuracy. It is used for cutting and drilling printed circuit boards, shaping enclosures and connectors, producing heat sinks, creating electronic components, and prototyping.
Optical Communication Industry
CNC machining is used in the optical communication industry to create precise components such as fiber optic connectors, ferrules, optical filters, and couplers. These components are critical for the efficient transmission of data through optical fibers.
Military and Defense Industry
CNC machining is widely used in the defense industry for producing high-precision components for aerospace systems, weapon systems, armor, vehicle components, and communication and electronics equipment. It is critical for ensuring the reliability and performance of these systems.
Oil and Gas Industry
CNC machining is used extensively in the Oil and Gas industry for various applications, including manufacturing components for drilling equipment, valves, pumps, and pipelines. It's also used in the fabrication of offshore structures and the repair and refurbishment of equipment. CNC machining ensures high precision and reliability of critical components in harsh environments.
Energy Industry
In the energy industry, CNC machining produces intricate parts for various applications such as turbines, oil and gas drilling equipment, nuclear power plant components, and solar panel frames. The process guarantees high precision, accuracy, durability, and resistance to wear and tear.
Considerations When Buying CNC Machining
CNC machining is a key method of small and large part fabrication. Many industries rely on this type of machining because it produces extremely accurate and precise results. While there are tremendous benefits in purchasing a CNC machine, there are some key things to consider.
Things to Factor In
All types of CNC machining involve a financial investment and while much of the work is automated, there needs to be a certified operator onboard who performs a wide range of operations. Before making a purchase, a number of factors should be carefully analyzed to include:
●Cycle Time
●Parts Availability
●Cost Savings Potential with a Reduction of Staff
●Machine Tool Options
●Repair and Maintenance
●Rigidity Tighter Tolerances
●Trade in Value / Resell
●Warranty
Additional Options for Consideration
Control Related Options – These include things like program memory, macro programming, and tool life management
Machine Tools – Keep in mind that in addition to the tools already installed, an individual can often add tools for CNC machining. Of the tools expected are a parts catcher, signal light, work light, barfeeder interface, conveyors, M-codes, tool breakage detector, coolant chip flush, scales, and auto-door, pneumatic, or servo.
Options for Fixtures – As part of this are light curtains, M-codes, two-hand anti-tie down, part present detector, height of proposed fixture, PLC, and hydraulic or pneumatic clamping
Although CNC machining of various kinds can be purchased used as a means of saving money, this generally comes with challenges. For this reason, it is always recommended that individual buy machining new. Even though there is an upfront financial investment, it pays off in the long-run and eliminates risks.
For that reason, it makes more sense to purchase a new machine, one that will handle the type and volume of work but also CNC machining that offers necessary tools for the job.
Working Principle of Cnc Machining
Every processing technology has its own working principle. If we want to know what the working principle of a processing technology is, we only know that CNC processing is one of them. What is the working principle of CNC processing?
The control system of CNC machining center can generally control the machine tool to stop, change direction and speed automatically according to the digital program instruction. It can automatically control the feed speed, direction and processing path to process. It can select the cutting tool and adjust the cutting amount and walking track according to the cutting tool size, and can end all kinds of auxiliary actions required in the processing.
CNC machining structure CNC lathe is also composed of headstock, turret, feed transmission system, bed, hydraulic system, cooling system, lubrication system and other parts, but CNC lathe feed system and horizontal lathe feed system in the structure is essentially different, typical CNC lathe mechanical structure composition diagram. The movement of the horizontal lathe spindle is transmitted to the tool rest through the change gear frame, feed box and slide box to end the longitudinal and transverse feed movement. The CNC lathe is to select servo motor, through the ball screw to slide plate and turret, end Z direction (longitudinal) and set direction (transverse) feed movement. Fine CNC machining also has the function of various threads. The movement between spindle rotation and tool rest movement is controlled by CNC system.
The Features of CNC Machining
High adaptability. Using CNC machine to produce different components always decided by different program. It doesn’t need to produce and change too many tooling and clamp like general machine. So CNC machining is more used for small batch production, new products development, etc. It can help reducing the production time and costs.
High precision. The precision by CNC machining can reach to 0.005-0.01mm. The CNC machine is controlled by numeric signal. When the numeric equipment output a impulse signal,the machine moves workpiece moving a pulse equivalent(about 0.001mm). And the error between the reverse clearance of machine feed drive system and thread pitch can compensate by the numeric equipment. So the CNC machining have high precision.
The quality of CNC machining is stabilization and reliable. Using the same CNC machine with the same tooling and program to produce a batch of components, the cutting path is absolutely the same for each workpiece. So the production components is all the same.
Improving working condition. After adjustment of CNC machine,input the program and then start the machine,the machine can produce workpiece automatically and continuously. The operator just need to input the program, edit, clamp and remove the workpiece,preparing tooling, watching the processing and inspecting the workpiece.
Common Plastic Materials for CNC Machining
Plastic resins used for CNC milling and turning must be rigid enough to hold their shape while they're clamped in a vise or fixture. That's one consideration that narrows the field of available materials. The following types of plastic resin have proven themselves over the years because they are stable, strong, easily machined, and produce great finished parts and prototypes.
ABS
ABS is an excellent choice for CNC machining. ABS is a tough, impact-resistant plastic that's also resistant to chemicals and electrical current.
ABS is easy to color so it produces good cosmetic results. Because of its versatility and strength, it's the most common plastic that we use for rapid prototyping. You'll find it in automotive components, power tools, toys and sporting goods, among many other applications. ABS is less expensive than other engineering plastics like PEEK or Ultem but it doesn't withstand high temperatures for long periods of time.
Nylon
Nylon has many of the same desirable characteristics as ABS. It has greater tensile strength which is why we use it for fabric and rope. Nylon and ABS resins are often mixed together, along with glass fibers, to enhance their desirable properties. Nylon can replace many mechanical parts, and because it has good surface lubrication it's used for moving gears and sliding components. One drawback to nylon is that it does absorb moisture over time so it's not suitable for marine applications. And it can be tough on cutting tools during machining.
PMMA Acrylic
PMMA is a rigid, transparent resin used as a substitute for glass or when making other clear optical parts. It resists scratching but is less impact resistant than polycarbonate. One advantage of PMMA is that it doesn't contain Bisphenol-A, so it can be used for food storage. After machining, acrylic shows a hazy, matte surface. The surface can be treated with vapor polishing, which we do at Star Rapid, to make it optically clear. One thing to be aware of about acrylic is that it's susceptible to heat deformation, so it should be stress-relieved before machining. PMMA is used for display screens, light pipes, lenses, clear enclosures, food storage, and to replace glass if strength is not an issue.
PEEK
PEEK is a true high-strength and stable engineering plastic. It can be used as a substitute for metal in many applications and it can withstand prolonged exposure to high temperatures. PEEK is used for advanced medical, aerospace, and electronic components. It's also a great choice for lightweight fixtures because it doesn't tend to creep, or deform, over time like other resins. PEEK is much more expensive than many other plastics so it tends to be used only when nothing else will do. In many cases, it's necessary to anneal it during the machining process, or else it will form stress fractures.
UHMWPE
This long name means “ultra high molecular weight polyethylene”. There are in fact several different kinds of PE, with different mechanical and chemical properties. UHMWPE is especially hard and strong, very resistant to chemicals, and has a naturally slippery surface. All of these traits make UHMWPE the standard of care for joint replacements. This material is also used in marine environments, food and chemical processing, and for gear trains and conveyor belts.
How To Choose The Right CNC Machining Materials? Our Step-by-Step Guidelines
The above information can help inform your decision about what material will best suit your application, bearing in mind that in many cases more than one choice will work just fine.
We always advise our partner clients to consider the environment that the part will be used in, and what kinds of forces it will be subjected to throughout its service life. Although there are many variables, in our experience these are the areas that have the largest effect on raw material suitability.
Moisture
Does the product need to withstand salt or freshwater? Some metals and plastics are naturally resistant to corrosion, while other materials may need additional surface treatments such as painting, plating, or anodizing. And yes, even many types of plastic, such as nylon, can absorb water over time which will lead to premature part failure.
Strength
There are several different ways to understand the concept of strength as it applies to material science, and the subject is a very complex and technical one. In general, product engineers are usually concerned about:
Tensile strength: How well does the material resist a pulling force?
Compression or load bearing: How well does the material resist a constant load?
Toughness: How well does the material resist tearing?
Elasticity: How well does the material snap back to its original shape after a load is removed?
All materials differ in the various types of strength that they exhibit, so it's critical to know what your tolerable limits are and then choose a material that has an adequate safety factor well above those limits.
The good news is that there are many online material data websites that provide comprehensive technical information about all available commercial metal and plastic, so these should be consulted in advance.
Heat
All materials expand and contract in the presence of heat. This could potentially affect your part if it's going to be subjected to many heating and cooling cycles. As parts get hotter they also get softer and more flexible before they reach their melting point. Heat can also cause some plastic resins to outgas or to undergo thermal degradation that destroys its chemical bonds. Therefore, to prevent critical part failure always use a material that will be thermally stable at a temperature far above your expected working conditions.
Corrosion Resistance
Corrosion involves much more than just exposure to water. Any adverse chemical reaction with another foreign substance could potentially cause part failure. These substances include oils, reagents, acids, salts, alcohols, cleaners, etc. Consult the relevant material data sheets to verify that your metal or plastic can withstand any expected chemical exposure.
Machinability
Not so much an issue with relatively soft plastic, machinability can be a big deal with certain types of metal or carbon fiber. Extremely tough materials, and that does include carbon fiber, can quickly destroy expensive cutting tools. Others will require very careful control of cutting speed and feed rates. In addition, some materials can be processed faster than others. For longer production runs, using a metal that machines quickly can save significant time and money over the long term.
Cost
Obviously there are cost considerations with all raw materials. However, we strongly encourage all product developers to consider that saving cost by choosing a lower grade of material is never a good idea in the long term. Rather, choose the best material that you can afford which still offers all the necessary functionality. This helps to guarantee that the finished part will be durable.
Certificate
Our factory
Founded in 2019, Alec Model is located in Bao 'an District of Shenzhen, close to both Shenzhen Airport and Hong Kong Airport, covering an area of more than 2,600 square meters. There are 6 manufacturing zones including CNC machining zone, sheet metal making zone, manual work zone, polishing and finishing zone, quality management zone, engineering and project management zone, which can meet the production needs of various precision parts
FAQ
Q: What is the CNC machining process?
Milling, where the spindle rotates removing material.
Turning, where the cylindrical workpiece rotates while spindle is fixed removing the material.
Drilling, where a hole is cut into the workpiece.
Grinding, where a rolling, abrasive wheel removes light amounts of material.
Q: Is CNC machining easy?
Q: How long does CNC machining take?
Q: Is there a lot of math in CNC machining?
Q: Is CNC machining stressful?
Q: What degree do you need for CNC machining?
Q: How do I get started in CNC machining?
Download and install Fusion 360. Sign up as a Hobbyist / Enthusiast / Startup to get it for free.
Get a quick orientation of the user interface.
Download and install a script that will let you turn a 2D image into a 3D surface.
Use the script to create a 3D surface for CNC milling.
Q: What are the three methods of clamping CNC machining parts?
● Directly find the formal clip;
●Mark the line to find the correct clip
Q: What does the CNC machining process system include?
Q: What is the composition of the CNC machining process?
Q: How are benchmarks classified?
●Process benchmarks: process, measurement, assembly, positioning (original additions: rough benchmarks, fine benchmarks)
Q: What are the contents of CNC machining accuracy?
●Shape accuracy;
●Position accuracy.
Q: What are the original errors in the CNC machining process?
Q: The effect of process system stiffness on precision CNC machining accuracy (machine tool deformation, workpiece deformation)?
●CNC machining errors caused by changes in cutting force;
●CNC machining error caused by clamping force and gravity;
●The influence of transmission force and inertia force on machining accuracy.
Q: What are the ways to ensure and improve the precision of precision CNC machining?
●Error compensation technology: On-line detection of paired parts, automatic grinding, and active control of the decisive error factors.
Q: What is included in the surface geometry of CNC machining?
Q: Try to analyze the factors that affect the surface roughness of CNC machining?
Q: Try to analyze the factors that affect the surface roughness of grinding CNC machining?
●Influence of physical factors: plastic deformation of surface layer metal, grinding amount, selection of grinding wheel.
Q: Try to analyze the factors that affect the cold work hardening of the CNC machining surface?
Q: Prevention and control of CNC machining vibration?
We're professional CNC machining manufacturers and suppliers in China, specialized in providing high quality OEM&ODM service. We warmly welcome you to buy customized CNC machining from our factory. Contact us for quotation and free sample.
Laser Cutting Metal Sheet Parts, High Precision Aluminium Turned Parts, Insert Moulding